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Search Results (1,659)

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Keywords = luminescent property

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31 pages, 7893 KB  
Review
Recent Progress in Photoresponsive Room-Temperature Phosphorescent Materials: From Mechanistic Insights to Functional Applications
by Yeqin Chen, Yu Huang, Zao Zeng and Guiwen Luo
Molecules 2025, 30(20), 4120; https://doi.org/10.3390/molecules30204120 - 17 Oct 2025
Abstract
Room-temperature phosphorescence (RTP) materials with photo-responsive properties have attracted increasing attention for applications in smart luminescent switches, optical logic control, and multidimensional information storage. Compared to other external stimuli, light offers the advantages of non-contact control, high spatiotemporal resolution, and excellent programmability, making [...] Read more.
Room-temperature phosphorescence (RTP) materials with photo-responsive properties have attracted increasing attention for applications in smart luminescent switches, optical logic control, and multidimensional information storage. Compared to other external stimuli, light offers the advantages of non-contact control, high spatiotemporal resolution, and excellent programmability, making it an ideal strategy for reversible and dynamic modulation of RTP. This review summarizes recent advances in light-triggered RTP systems coupled with photochromism. From a structural design perspective, we discuss strategies to integrate photochromic and RTP units within a single material system, covering photoisomerizable molecules, metal–organic complexes, organic–inorganic hybrids, and purely organic radicals. These materials demonstrate unique advantages in fields such as information encryption, bioimaging, and light-controlled upconversion. Finally, future design directions and challenges are proposed, aiming toward high-security, long-lifetime, and multi-channel collaborative luminescent systems. Full article
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21 pages, 6939 KB  
Article
Facile Reversible Eu2+/Eu3+ Redox in Y2SiO5 via Spark Plasma Sintering: Dwell Time-Dependent Luminescence Tuning
by Fernando Juárez-López, Merlina Angélica Navarro-Villanueva, Rubén Cuamatzi-Meléndez, Margarita García-Hernández, María José Soto-Miranda and Angel de Jesús Morales-Ramírez
Inorganics 2025, 13(10), 325; https://doi.org/10.3390/inorganics13100325 - 30 Sep 2025
Viewed by 257
Abstract
The present study investigates the luminescent behaviour of sol–gel derived Y2SiO5 powders doped with Eu3+ ions, subjected to spark plasma sintering. The sintering process induces the partial reduction of Eu3+ to Eu2+, and the phenomenon is [...] Read more.
The present study investigates the luminescent behaviour of sol–gel derived Y2SiO5 powders doped with Eu3+ ions, subjected to spark plasma sintering. The sintering process induces the partial reduction of Eu3+ to Eu2+, and the phenomenon is strongly dependent on the holding time within the SPS chamber. The luminescent properties are tunable via the initial Eu concentration, holding time and excitation wavelength, resulting in a wide range of emission colours from red (Eu3+) at 220 nm excitation to blue (Eu2+) at 365 nm, and mixed colours at 257 nm. Moreover, the Eu3+/Eu2+ redox process is reversible. Overall, the results demonstrate that SPS conditions can be exploited to modulate the valence state of luminescent centres, which is reversible by oxidation under ambient conditions, enabling controlled modulation of the optical properties. Full article
(This article belongs to the Special Issue Rare-Earth Luminescent Materials)
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24 pages, 5835 KB  
Article
Study on the Structure-Luminescence Relationship and Anti-Counterfeiting Application of (Ca,Sr)-Al-O Composite Fluorescent Materials
by Jianhui Lv, Jigang Wang, Yuansheng Qi, Jindi Hu, Haiming Li, Chuanming Wang, Xiaohan Cheng, Deyu Pan, Zhenjun Li and Junming Li
Nanomaterials 2025, 15(18), 1446; https://doi.org/10.3390/nano15181446 - 19 Sep 2025
Viewed by 336
Abstract
A novel long-lasting luminescent composite material based on the (Ca,Sr)-Al-O system was synthesized using a solution combustion method. (Ca,Sr)3Al2O6 is the primary phase, with SrAl2O4 as a controllable secondary phase. Compared to conventional single-phase SrAl [...] Read more.
A novel long-lasting luminescent composite material based on the (Ca,Sr)-Al-O system was synthesized using a solution combustion method. (Ca,Sr)3Al2O6 is the primary phase, with SrAl2O4 as a controllable secondary phase. Compared to conventional single-phase SrAl2O4 phosphors, the introduction of a calcium-rich hexaaluminate matrix creates additional defects and a specific trap distribution at the composite interface, significantly improving carrier storage and release efficiency. Eu2+ + Nd3+ synergistic doping enables precise control of the trap depth and number. Under 365 nm excitation, Eu2+ emission is located at ~515 nm, with Nd3+ acting as an effective trap center. Under optimal firing conditions at 700 °C (Eu2+ = 0.02, Nd3+ = 0.003), the afterglow lifetime exceeds 30 s. Furthermore, The (Ca,Sr)3Al2O6 host stabilizes the lattice and optimizes defect states, while synergizing with the SrAl2O4 secondary phase to improve the afterglow performance. This composite phosphor exhibits excellent dual-mode anti-counterfeiting properties: long-lasting green emission under 365 nm excitation and transient blue-violet emission under 254 nm excitation. Based on this, a screen-printing ink was prepared using the phosphor and ethanol + PVB, enabling high-resolution QR code printing. Pattern recognition and code verification can be performed both in the UV on and off states, demonstrating its great potential in high-security anti-counterfeiting applications. Compared to traditional single-phase SrAl2O4 systems, this study for the first time constructed a composite trap engineering of the (Ca,Sr)3Al2O6 primary phase and the SrAl2O4 secondary phase, achieving the integration of dual-mode anti-counterfeiting functionality with a high-resolution QR code fluorescent ink. Full article
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13 pages, 4248 KB  
Article
Luminescence Properties of Eu3+, Ba2+, and Bi3+ Co-Doped YVO4 for Wide-Spectrum Excitation
by Jianhua Huang, Cong Dong, Ping Huang, Wei Zhong, Yinqi Luo, Jianmin Li, Yibiao Hu, Wenjie Duan, Lingjia Qiu, Wenzhen Qin and Yu Xie
Nanomaterials 2025, 15(18), 1444; https://doi.org/10.3390/nano15181444 - 19 Sep 2025
Viewed by 371
Abstract
YVO4 based phosphors have aroused extensive interest in the field of optoelectronics due to their good chemical stability and unique luminescence properties. However, commercialization of YVO4 phosphors requires high luminescence intensity, enhanced conversion efficiency, and a wide excitation spectrum. In this [...] Read more.
YVO4 based phosphors have aroused extensive interest in the field of optoelectronics due to their good chemical stability and unique luminescence properties. However, commercialization of YVO4 phosphors requires high luminescence intensity, enhanced conversion efficiency, and a wide excitation spectrum. In this work, Eu3+, Ba2+, Bi3+ co-doped YVO4 was prepared by the sol–gel method. The XRD of YVO4: 5%Eu3+, 5%Ba2+, 0.5%Bi3+ phosphor analysis confirms the pure tetragonal phase, with a fairly large size of approximately 100 nm for the optimal composition. And the SEM and TEM revealed well-dispersed spherical nanoparticles with sizes of 100–120 nm. The introduction of Ba2+ ions enhanced the luminescence intensity, while the incorporation of Bi3+ ions improved the excitation width of the phosphor. The resulting YVO4: 5%Eu3+, 5%Ba2+, 0.5%Bi3+ phosphor exhibited a 1.39-times broader excitation bandwidth and a 2.72-times greater luminescence intensity at 618 nm compared to the benchmark YVO4: 5% Eu3+ sample. Additionally, the transmittance of the films in the 350 nm to 800 nm region exceeded 85%. The YVO4: 5%Eu3+, 5%Ba2+, 0.5%Bi3+ film effectively absorbed ultraviolet light and converted it to red emission, enabling potential applications in solar cell window layers, dye-sensitized cell luminescence layers, and solar cell packaging glass. Full article
(This article belongs to the Section Physical Chemistry at Nanoscale)
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11 pages, 8680 KB  
Article
Electron-Phonon Interaction in Te-Doped (NH4)2SnCl6: Dual-Parameter Optical Thermometry (100–400 K)
by Ting Geng, Yuhan Qin, Zhuo Chen, Yuhan Sun, Ao Zhang, Mengyuan Lu, Mengzhen Lu, Siying Zhou, Yongguang Li and Guanjun Xiao
Chemistry 2025, 7(5), 150; https://doi.org/10.3390/chemistry7050150 - 16 Sep 2025
Viewed by 396
Abstract
Lead-free perovskite variants have emerged as promising candidates due to their self-trapped exciton emission. However, in ASnX3 systems, facile oxidation of Sn(II) to Sn(IV) yields A2SnCl6 vacancy-ordered derivatives. Paradoxically, despite possessing a direct bandgap, these variants exhibit diminished photoluminescence [...] Read more.
Lead-free perovskite variants have emerged as promising candidates due to their self-trapped exciton emission. However, in ASnX3 systems, facile oxidation of Sn(II) to Sn(IV) yields A2SnCl6 vacancy-ordered derivatives. Paradoxically, despite possessing a direct bandgap, these variants exhibit diminished photoluminescence (PL). Doping engineering thus becomes essential for precise optical tailoring of A2SnX6 materials. Herein, through integrated first-principles calculations and spectroscopic analysis, we elucidate the luminescence mechanism in Te4+-doped (NH4)2SnCl6 lead-free perovskites. Density functional theory, X-ray diffraction (XRD) patterns and X-ray photoelectron spectroscopy (XPS) confirm Te4+ substitution at Sn sites via favorable chemical potentials. Spectral interrogations, including absorption and emission profiles, reveal that the intense emission originates from the triplet STE recombination (3P11S0) of Te centers. Temperature-dependent PL spectra further demonstrate strong electron–phonon coupling that induces symmetry-breaking distortions to stabilize STEs. Complementary electronic band structure and molecular orbital calculations unveil the underlying photophysical pathway. Leveraging these distinct thermal responses of PL intensity and peak position, 0.5%Te:(NH4)2SnCl6 emerges as a highly promising candidate for non-contact, dual-parameter optical thermometry over an ultra-broad range (100–400 K). This work provides fundamental insights into the exciton dynamics and thermal engineering of optical properties in this material system, establishing its significant potential for advanced temperature-sensing applications. Full article
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14 pages, 3848 KB  
Article
Low-Temperature Synthesis and Photoluminescence Properties of Mg2TiO4:Mn4+ Phosphor Prepared by Solid-State Reaction Methods Assisted by LiCl Flux
by Chenxing Liao, Huihuang Cai, Dongyuan Dai and Liaolin Zhang
Solids 2025, 6(3), 53; https://doi.org/10.3390/solids6030053 - 11 Sep 2025
Viewed by 452
Abstract
Mg2TiO4:Mn4+ (MTO:Mn4+) red phosphor has important applications in areas such as red LEDs and forensic science, but the preparation of MTO:Mn4+ through the solid-state reaction method requires a high sintering temperature. Herein, MTO:Mn4+ red [...] Read more.
Mg2TiO4:Mn4+ (MTO:Mn4+) red phosphor has important applications in areas such as red LEDs and forensic science, but the preparation of MTO:Mn4+ through the solid-state reaction method requires a high sintering temperature. Herein, MTO:Mn4+ red phosphor was synthesized using the solid-state reaction method with LiCl flux, and its crystallographic structure and photoluminescence properties were studied to determine the influence of experimental parameters like the amount of fluxing agent added and sintering temperature in producing a bright red phosphor suitable for LEDs. The experimental results showed that samples with added LiCl could form pure MTO after sintering at 950 °C, whereas those without LiCl still contained a mixture of MTO and MgTiO3, even when sintered at 1400 °C. The optimal performance was achieved with a sample doped with 0.2 mol% Mn4+, synthesized using 50 wt% LiCl flux and sintered at 950 °C for 12 h. This sample exhibited a broad excitation band and a narrow red emission band peaking at 662 nm, confirming its excellent luminescence properties. Furthermore, a prototype red LED fabricated with a 377 nm chip and MTO:0.2% Mn4+ phosphor achieved photoelectric conversion efficiency of 78.5% at a 100 mA drive current, confirming its viability for high-performance red LED manufacturing. Full article
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76 pages, 13574 KB  
Review
Luminescence Properties of Defects in GaN: Solved and Unsolved Problems
by Michael A. Reshchikov
Solids 2025, 6(3), 52; https://doi.org/10.3390/solids6030052 - 10 Sep 2025
Viewed by 1660
Abstract
Gallium Nitride (GaN) is a wide-bandgap semiconductor that has revolutionized optoelectronic applications, enabling blue/white light-emitting devices and high-power electronics. Point defects in GaN strongly influence its optical and electronic properties, producing both beneficial and detrimental effects. This review provides a comprehensive update on [...] Read more.
Gallium Nitride (GaN) is a wide-bandgap semiconductor that has revolutionized optoelectronic applications, enabling blue/white light-emitting devices and high-power electronics. Point defects in GaN strongly influence its optical and electronic properties, producing both beneficial and detrimental effects. This review provides a comprehensive update on the current understanding of point defects in GaN and their impact on photoluminescence (PL). Since our earlier review (Reshchikov and Morkoç, J. Appl. Phys. 2005, 97, 061301), substantial progress has been made in this field. PL bands associated with major intrinsic and extrinsic defects in GaN are now much better understood, and several defects in undoped GaN (arising from unintentional impurities or specific growth conditions) have been identified. Notably, the long-debated origin of the yellow luminescence band in GaN has been resolved, and the roles of Ga and N vacancies in the optical properties of GaN have been revised. Zero-phonon lines have been discovered for several defects. Key parameters, such as electron- and hole-capture coefficients, phonon energies, electron–phonon coupling strength, thermodynamic charge transition levels, and the presence of excited states, have been determined or refined. Despite these advances, several puzzles associated with PL remain unsolved, highlighting areas for future investigation. Full article
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38 pages, 13226 KB  
Article
Structural Speciation of Hybrid Ti(IV)-Chrysin Systems—Biological Profiling and Antibacterial, Anti-Inflammatory, and Tissue-Specific Anticancer Activity
by Sevasti Matsia, Georgios Lazopoulos, Antonios Hatzidimitriou and Athanasios Salifoglou
Molecules 2025, 30(18), 3667; https://doi.org/10.3390/molecules30183667 - 9 Sep 2025
Viewed by 692
Abstract
Metal–organic compounds, and especially those containing well-known antioxidant natural flavonoids (Chrysin, Chr) and metal ions (Ti(IV)), attract keen interest for their potential biological activity nutritionally and pharmacologically. To that end, chemical reactivity profiling in binary/ternary systems was investigated synthetically, revealing unique structural correlations [...] Read more.
Metal–organic compounds, and especially those containing well-known antioxidant natural flavonoids (Chrysin, Chr) and metal ions (Ti(IV)), attract keen interest for their potential biological activity nutritionally and pharmacologically. To that end, chemical reactivity profiling in binary/ternary systems was investigated synthetically, revealing unique structural correlations between mononuclear (Ti(IV)-Chr) and tetranuclear assemblies (Ti(IV)-Chr-phen). Chemical profiling involved physicochemical characterization through elemental analysis, FT-IR, UV–Visible, 1D-2D NMR, ESI-MS spectrometry, solid-state luminescence, and X-ray crystallography, with theoretical work on intra(inter)molecular interactions of 3D assemblies pursued through Hirshfeld analysis and BVS calculations. An in-depth study of their chemical reactivity shed light onto specific structural properties in the solid-state and in solution, while concurrently exemplifying quenching behavior due to their distinct flavonoid pattern. In the framework of biological activity, the materials were investigated for their antibacterial properties toward Gram(−)-E. coli and Gram(+)-S. aureus, exhibiting an enhanced effect compared to the free ligand and metal ion. Further investigation of BSA denaturation revealed strong anti-inflammatory properties compared to Chr and Diclofenac, an anti-inflammatory agent. Finally, in vitro studies using physiological and cancer cell lines, including breast (MCF10A, MCF7) and lung tissues (MRC-5, A549), formulated a structure–tissue relation reactivity profile, thus justifying their potential as future metallodrugs. Full article
(This article belongs to the Special Issue Synthesis and Biological Evaluation of Coordination Compounds)
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11 pages, 2162 KB  
Article
Synthesis and Purification of [Eu(BA)4(pip)] Rare-Earth Molecular Crystals
by Xiangtai Xi, Wenli Fan, Jun Huang, Haoyang Chen, Huan Chen, Zhengkun Fu and Zhenglong Zhang
Nanomaterials 2025, 15(17), 1348; https://doi.org/10.3390/nano15171348 - 2 Sep 2025
Viewed by 672
Abstract
Europium mononuclear complexes are able to form organic molecular crystals by aggregation of molecules through non-covalent bonding interactions. These crystals have many unique optical properties. However, this kind of crystal still faces some difficulties and challenges in the process of research and application, [...] Read more.
Europium mononuclear complexes are able to form organic molecular crystals by aggregation of molecules through non-covalent bonding interactions. These crystals have many unique optical properties. However, this kind of crystal still faces some difficulties and challenges in the process of research and application, such as the high difficulty of synthesis and purification, and the difficulty of spectral property modulation. In this work, an europium-containing rare-earth molecular crystal material [Eu(BA)4(pip)], was prepared via a solvothermal method. It is characterized by low melting point, low polarity, stable structure, high luminescence intensity, and has the potential for the preparation of quantum optical devices. After that, optimized the structure of the molecular crystals by petroleum ether solvent. Through the recrystallization process, a uniform and continuous film was formed, which resulted with a more regular surface morphology, and the changes in the optimized crystal structure had an effect on the europium ion electron-leap energy level, the fluorescence emission spectra also showed higher fluorescence resolving ratio. This study particular emphasis on enhancing the quality of [Eu(BA)4(pip)] molecular crystals and investigating their impact on their spectral properties. Full article
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25 pages, 5326 KB  
Article
A Para-Substituted 2-Phenoxy-1,10-Phenanthroline Ligand for Lanthanide Sensitization: Asymmetric Coordination and Enhanced Emission from Eu3+, Tb3+, Sm3+ and Dy3+ Complexes
by Joana Zaharieva, Vladimira Videva, Mihail Kolarski, Rumen Lyapchev, Bernd Morgenstern and Martin Tsvetkov
Molecules 2025, 30(17), 3548; https://doi.org/10.3390/molecules30173548 - 29 Aug 2025
Viewed by 747
Abstract
A para-substituted 1,10-phenanthroline ligand, 2-(4-methylphenoxy)-1,10-phenanthroline (L24), was synthesized and structurally characterized. Complexes with Eu3+, Tb3+, Sm3+, and Dy3+ were obtained in a 2:1 ligand-to-metal ratio and analyzed using single-crystal x-ray diffraction, photoluminescence spectroscopy, and TD-DFT calculations. [...] Read more.
A para-substituted 1,10-phenanthroline ligand, 2-(4-methylphenoxy)-1,10-phenanthroline (L24), was synthesized and structurally characterized. Complexes with Eu3+, Tb3+, Sm3+, and Dy3+ were obtained in a 2:1 ligand-to-metal ratio and analyzed using single-crystal x-ray diffraction, photoluminescence spectroscopy, and TD-DFT calculations. Coordination via the phenanthroline nitrogen atoms, combined with steric asymmetry from the para-methylphenoxy group, induces low-symmetry environments favorable for electric-dipole transitions. Excited-state lifetimes reached 2.12 ms (Eu3+) and 1.12 ms (Tb3+), with quantum yields of 42% and 68%, respectively. The triplet-state energy of L24 (22,741 cm−1) aligns well with emissive levels of Eu3+ and Tb3+, consistent with Latva’s criterion. Fluorescence titrations indicated positively cooperative complexation, with association constants ranging from 0.60 to 1.67. Stark splitting and high 5D07F2/7F1 intensity ratios (R2 = 6.25) confirm the asymmetric coordination field. The para-methylphenoxy substituent appears sufficient to lower coordination symmetry and strengthen electric-dipole transitions, offering a controlled route to enhance photoluminescence in Eu3+ and Tb3+ complexes. Full article
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22 pages, 4117 KB  
Review
Chiral Rare Earth Nanomaterials: Synthesis, Optical Properties, and Potential Applications
by Lei Zhao, Pan Liang, Hua Zhao, Rongrong Hu, Yangyang Xu, Fangfang Chen, Xianghu Wang and Yunhua Yao
Nanomaterials 2025, 15(17), 1321; https://doi.org/10.3390/nano15171321 - 28 Aug 2025
Viewed by 778
Abstract
Chiral rare earth nanomaterials, which impart optical activity through chiral structures or ligands, possess promising application potential in optoelectronic displays, biosensing, information encryption, and catalysis due to unique properties like circularly polarized luminescence, exceptional photostability, and tunable optics. This review systematically summarizes recent [...] Read more.
Chiral rare earth nanomaterials, which impart optical activity through chiral structures or ligands, possess promising application potential in optoelectronic displays, biosensing, information encryption, and catalysis due to unique properties like circularly polarized luminescence, exceptional photostability, and tunable optics. This review systematically summarizes recent advancements, focusing on synthetic strategies, distinctive optical properties, and experimental demonstrations of applications across various fields. Finally, prospects and challenges for future development are discussed. These studies advance the understanding of circularly polarized luminescence and enable the flexible design and fabrication of chiral rare earth nanomaterials with engineered functionalities, addressing practical challenges in optoelectronic displays and biomedicine. Full article
(This article belongs to the Special Issue Advances in Luminescent Rare-Earth Nanomaterials)
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15 pages, 4933 KB  
Article
Impact of Type and Degree of Defect on Selected Properties of Graphene Quantum Dots
by Lukasz Kaczmarek, Piotr Zawadzki, Magdalena Balik, Piotr Kosobudzki and Adam Roslak
Molecules 2025, 30(17), 3521; https://doi.org/10.3390/molecules30173521 - 28 Aug 2025
Viewed by 531
Abstract
Graphene quantum dots (QGDs), as nascent carbon-based materials, demonstrate remarkable promise in many different applications. Thanks to excellent electrical and thermal properties, great biocompatibility, feasibility of surface functionalization and low cytotoxicity, QGDs can be any material and have many applications, from elastic PV [...] Read more.
Graphene quantum dots (QGDs), as nascent carbon-based materials, demonstrate remarkable promise in many different applications. Thanks to excellent electrical and thermal properties, great biocompatibility, feasibility of surface functionalization and low cytotoxicity, QGDs can be any material and have many applications, from elastic PV panels to drug delivery. This paper concentrates on relating the structure of the QGD (which is the result of the synthesis method used and consequently the variable degree of defect, the possible presence of functional groups especially in the defect region, etc.) to the resulting physicochemical properties. Therefore, the aim of this study is to theoretically relate and determine the effect of defect amount and type on the value of the HOMO–LUMO gap with respect to possible QGD luminescence colors. Finally, it presents a direction in new graphene-based materials synthesis, where every single defect has a huge impact on its properties. Full article
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26 pages, 5432 KB  
Article
Boron-Modified Anodization of Preferentially Oriented TiO2 Nanotubes for Photoelectrochemical Applications
by Fedor Zykov, Or Rahumi, Igor Selyanin, Andrey Vasin, Ivan Popov, Vadim Kartashov, Konstantin Borodianskiy and Yuliy Yuferov
Appl. Sci. 2025, 15(17), 9405; https://doi.org/10.3390/app15179405 - 27 Aug 2025
Viewed by 694
Abstract
This study investigates the synthesis and characterization of boron-modified nanotubular titania (NTO) arrays fabricated via a single-step anodizing process with varying concentrations of boric acid (BA). Following anodization, a reductive heat treatment was applied to facilitate the crystallization of the anatase phase in [...] Read more.
This study investigates the synthesis and characterization of boron-modified nanotubular titania (NTO) arrays fabricated via a single-step anodizing process with varying concentrations of boric acid (BA). Following anodization, a reductive heat treatment was applied to facilitate the crystallization of the anatase phase in the boron-modified NTO. The effect of the BA concentration on the structural, morphological, and photoelectrochemical (PEC) properties of the NTOs was systematically explored through scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), luminescence, and UV-Vis spectrometry. The introduction of boron during anodization facilitated the formation of sub-bandgap states, thereby enhancing the light absorption and electron mobility. This study revealed the optimal BA concentration that yielded a 3.3-fold enhancement of the PEC performance, attributed to a reduction in the bandgap energy. Notably, the highest incident photon-to-current conversion efficiency (IPCE) was observed for NTO samples anodized at a 0.10 M BA concentration. These findings underscore the promise of boron-modified NTOs for advanced photocatalytic applications, particularly in solar-driven water-splitting processes. Full article
(This article belongs to the Section Chemical and Molecular Sciences)
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17 pages, 2310 KB  
Article
High-Performance X-Ray Detection and Optical Information Storage via Dual-Mode Luminescent Modulation in Na3KMg7(PO4)6:Eu
by Yanshuo Han, Yucheng Li, Xue Yang, Yibo Hu, Yuandong Ning, Meng Gu, Guibin Zhai, Sihan Yang, Jingkun Chen, Naixin Li, Kuan Ren, Jingtai Zhao and Qianli Li
Molecules 2025, 30(17), 3495; https://doi.org/10.3390/molecules30173495 - 26 Aug 2025
Viewed by 898
Abstract
Lanthanide-doped inorganic luminescent materials have been extensively studied and applied in X-ray detection and imaging, anti-counterfeiting, and optical information storage. However, many reported rare-earth-based luminescent materials show only single-mode optical responses, which limits their applications in complex scenarios. Here, we report a novel [...] Read more.
Lanthanide-doped inorganic luminescent materials have been extensively studied and applied in X-ray detection and imaging, anti-counterfeiting, and optical information storage. However, many reported rare-earth-based luminescent materials show only single-mode optical responses, which limits their applications in complex scenarios. Here, we report a novel Na3KMg7(PO4)6:Eu phosphor synthesized by a simple high-temperature solid-state method. The multi-color luminescence of Eu2+ and Eu3+ ions in a single matrix of Na3KMg7(PO4)6:Eu, known as radio-photoluminescence, is achieved through X-ray-induced ion reduction. It demonstrated a good linear response (R2 = 0.9897) and stable signal storage (storage days > 50 days) over a wide range of X-ray doses (maximum dose > 200 Gy). In addition, after X-ray irradiation, this material exhibits photochromic properties ranging from white to brown in a bright field and shows remarkable bleaching and recovery capabilities under 254 nm ultraviolet light or thermal stimulation. This dual-modal luminescent phosphor Na3KMg7(PO4)6:Eu, which combines photochromism and radio-photoluminescence, presents a dual-mode X-ray detection and imaging strategy and offers a comprehensive and novel solution for applications in anti-counterfeiting and optical information encryption. Full article
(This article belongs to the Special Issue Organic and Inorganic Luminescent Materials, 2nd Edition)
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13 pages, 2267 KB  
Article
Luminescent Imidazo[1,5-a]pyridine Cores and Corresponding Zn(II) Complexes: Structural and Optical Tunability
by G. Volpi, A. Giordana, E. Priola, R. Rabezzana and E. Diana
Inorganics 2025, 13(9), 283; https://doi.org/10.3390/inorganics13090283 - 25 Aug 2025
Viewed by 695
Abstract
A new series of luminescent Zn(II) complexes based on mono- and bis-imidazo[1,5-a]pyridine ligands was synthesized to investigate the correlation between structural modifications and photophysical behaviour. Systematic variations in substituent groups, coordination geometry, and π-conjugation extent enabled precise tuning of absorption and [...] Read more.
A new series of luminescent Zn(II) complexes based on mono- and bis-imidazo[1,5-a]pyridine ligands was synthesized to investigate the correlation between structural modifications and photophysical behaviour. Systematic variations in substituent groups, coordination geometry, and π-conjugation extent enabled precise tuning of absorption and emission properties. Spectroscopic analysis revealed that Zn(II) coordination enhances molecular rigidity and induces a conformational change in the ligands, resulting in improved quantum yields (up to 37%) and significant blue shifts in emission. Notably, in bis-ligand systems, each imidazo[1,5-a]pyridine unit retains its distinct emissive signature upon complexation, demonstrating their optical and electronic independence. This modular behaviour confirms that individual emissive centres can be predictably manipulated without mutual interference, offering a powerful design strategy for multichromophoric materials. Structural, vibrational, and mass spectrometric characterizations further corroborate the stability and coordination patterns of the synthesized complexes. These insights lay the groundwork for engineering efficient and tunable Zn(II)-based luminophores for applications in optoelectronics, sensing, and bioimaging. Full article
(This article belongs to the Section Organometallic Chemistry)
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