Organic Light-Emitting Diodes: Recent Breakthroughs and Future Directions

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optoelectronics and Optical Materials".

Deadline for manuscript submissions: 15 March 2025 | Viewed by 992

Special Issue Editors


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Guest Editor
Department of Opto-Electronic Engineering, National Dong Hwa University, Hualien 974301, Taiwan
Interests: OLED; QD-LED; lifetime; light extraction; photophysics of organic thin film

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Guest Editor
Department of Chemistry, Soochow University, 70, Linhsi Rd., Shihlin, Taipei 111002, Taiwan
Interests: organic light-emitting diodes; organic electronic materials; device engineering; photochemistry

Special Issue Information

Dear Colleagues,

Organic light-emitting diodes (OLEDs) have been continuously developed over past three decades, with academic and industrial sectors focusing on exploring the advancement of materials as well as manufacturing processes associated with OLED technology. Thanks to these efforts, OLEDs currently have extensive applications in the realms of smartphone screens, television displays, automotive interfaces, wristwatches, and even lighting panels. However, there are still some gaps to fill with premium OLED technologies in terms of AR/VR displays and/or solid lighting applications. Hence, we are launching a Special Issue to gather significant contributions from OLED experts or researchers. Original manuscripts (full length or reviews) may cover, but are not limited to, the following topics:

  1. Novel OLED materials (TADF, HLCT, MR-emitters, etc.);
  2. Novel OLED devices (tandem OLEDs, PIN OLEDs, hyperfluorescence OLEDs, transparent OLEDs, and TTAUC OLEDs);
  3. OLED light extraction technology;
  4. Approaches for elongating OLEDs’ operational lifetime.

In general, the scope of this Special Issue is to highlight the latest results of experimental and theoretical investigations on potential organic materials, devices, optics and lifetime, but extension to organic/inorganic hybrid ones, such as quantum dots or perovskite families, is also welcome.

Dr. Bo-Yen Lin
Dr. Yi-Ting Lee
Guest Editors

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Keywords

  • organic light-emitting diodes
  • designing and synthesis of efficient organic materials
  • OLED display and lighting
  • light extraction techniques
  • lifespan of OLED

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Published Papers (1 paper)

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Research

14 pages, 4065 KiB  
Article
The Improvement of Luminous Uniformity of Large-Area Organic Light-Emitting Diodes by Using Auxiliary Electrodes
by Fuh-Shyang Juang, Jia-You Chen, Wen-Kai Kuo and Krishn Das Patel
Photonics 2024, 11(9), 829; https://doi.org/10.3390/photonics11090829 - 2 Sep 2024
Viewed by 618
Abstract
The study developed a large emission area of flexible blue organic light-emitting diodes (BOLED) on a polyethylene terephthalate/ Indium tin oxide (PET/ITO) substrate using a polycyclic skeleton ν-DABNA Thermally Activated Delayed Fluorescence (TADF) material. Initially, a 1 × 1 cm2 blue OLED [...] Read more.
The study developed a large emission area of flexible blue organic light-emitting diodes (BOLED) on a polyethylene terephthalate/ Indium tin oxide (PET/ITO) substrate using a polycyclic skeleton ν-DABNA Thermally Activated Delayed Fluorescence (TADF) material. Initially, a 1 × 1 cm2 blue OLED was fabricated to optimize the layer thickness. The blue OLED structure consisted of PET/ITO/HATCN/TAPC/UBH-21:ν-DABNA/TPBi/LiF/Al. However, as the emission area increased to 3.5 × 3.5 cm2, the current density decreased due to the resistance of PET/ITO, leading to luminance non-uniformity. To address this issue, auxiliary Au lines were added to the ITO anode to enhance current injection. Despite this, when the Au lines reached a thickness of 30 nm, average light emission was disrupted. To improve the luminescence characteristics of large-area PET/ITO OLEDs, a capping and planarization layer of PEDOT:PSS was applied. Grid uniformity revealed a significant increase in overall luminance uniformity from 74.1% to 87.4% with the addition of auxiliary Au lines. Further increases in grid line density slightly reduced uniformity but enhanced brightness, resulting in brighter, flexible, large-area blue OLED lighting panels. Full article
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