Organic Light Emitting Diodes - OLEDs

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Optoelectronics".

Deadline for manuscript submissions: closed (31 January 2019) | Viewed by 10174

Special Issue Information

Dear Colleagues,

Organic Light-Emitting Diodes (OLEDs) have produced exciting achievements over the last decade. One of the most important achievements is the development of Thermally-Assisted Delayed Fluorescence (TADF)-type emitting molecules and the control of orientation of organic molecules. TADF molecules open a way to harvest both triplet and singlet excitons through fluorescence, enabling almost 100% internal quantum efficiency (IQE) using the merits of phosphorescent dyes. Furthermore, TADF molecules have shown their potential to overcome the critical issue in the present blue phosphorescent OLEDs. Next, controlling the dipole orientation of organic emitting molecules in OLEDs give a way to boost external quantum efficiency (EQE) over 40% without any external outcoupling structures. In addition, the control of the orientation and growth of organic transporting molecules is also important to achieve high mobility in organic thin-film transistors over 10 cm2/Vs. Based on the achievements, OLEDs have dominated small-sized mobile display market and they are rapidly expanding their territory toward next generation displays and lightings such as large sized flexible, stretchable displays, circuits and other device applications.

The main aim of this Special Issue is to seek high-quality submissions that highlight recent breakthroughs in OLEDs regarding molecular designs, control of intra- and inter molecular interactions, device architectures, new materials and processing, device physics, and new systems beyond OLEDs. The topics of interest include, but are not limited to:

  • Organic Light-Emitting diodes (OLEDs) materials
  • OLED device physics
  • Thermally activated delayed fluorescence
  • Molecular orientation
  • Light extraction and Lightings
  • Organic–inorganic hybrid LEDs
  • Perovskites
  • Organic thin film transistors
  • Flexible displays and lightings

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Published Papers (2 papers)

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Research

14 pages, 3534 KiB  
Article
Integration of Optical and Thermal Models for Organic Light-Emitting Diodes
by An-Chi Wei, Yih-Jong Huang, Bo-Lin Huang and Jyh-Rou Sze
Electronics 2019, 8(1), 17; https://doi.org/10.3390/electronics8010017 - 23 Dec 2018
Cited by 5 | Viewed by 3570
Abstract
This paper proposes a three-dimensional model for combinative analysis of the illuminative and thermal properties of organic light-emitting diodes (OLED). By means of the energy conversion ratio and energy conservation theory, two individual optical and thermal sub-models are integrated to form a single [...] Read more.
This paper proposes a three-dimensional model for combinative analysis of the illuminative and thermal properties of organic light-emitting diodes (OLED). By means of the energy conversion ratio and energy conservation theory, two individual optical and thermal sub-models are integrated to form a single model constructed in a multi-physics platform. According to the measured luminous performance and temperature distribution of the fabricated OLED samples, the proposed model demonstrates sufficient accuracy. Moreover, the temperature distribution on the cross-section of the OLED can be derived from the proposed model and used as a valuable reference for manufacturers to select appropriate organic materials. Full article
(This article belongs to the Special Issue Organic Light Emitting Diodes - OLEDs)
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9 pages, 4067 KiB  
Article
Improvement of Colour Gamut in Bottom-Emission Organic Light-Emitting Diodes Using Micro-Cavity Structure Embedded Cathodes
by Hyunkoo Lee, Jonghee Lee, Jeong-Ik Lee and Nam Sung Cho
Electronics 2018, 7(9), 155; https://doi.org/10.3390/electronics7090155 - 21 Aug 2018
Cited by 9 | Viewed by 6205
Abstract
We demonstrate an approach for improving the colour gamut of bottom-emission organic light-emitting diodes (OLEDs) through micro-cavity structure embedded cathodes. The devices with micro-cavity structure embedded cathodes showed an improved colour gamut of 91.5% (National Television System Committee (NTSC)), 95.8% (Adobe RGB), and [...] Read more.
We demonstrate an approach for improving the colour gamut of bottom-emission organic light-emitting diodes (OLEDs) through micro-cavity structure embedded cathodes. The devices with micro-cavity structure embedded cathodes showed an improved colour gamut of 91.5% (National Television System Committee (NTSC)), 95.8% (Adobe RGB), and 129.2% (sRGB), compared to those of the devices without micro-cavity structure embedded cathodes—59.2% (NTSC), 62.0% (Adobe RGB), 83.6% (sRGB). In addition, the performance of red, green, and blue devices are also investigated depending on the optical length of the micro-cavity structure. Full article
(This article belongs to the Special Issue Organic Light Emitting Diodes - OLEDs)
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