Journal ArticleDOI
Efficient Deep Blue Electroluminescence with an External Quantum Efficiency of 6.8% and CIEy < 0.08 Based on a Phenanthroimidazole–Sulfone Hybrid Donor–Acceptor Molecule
Xiangyang Tang,Qing Bai,Qiming Peng,Yu Gao,Jinyu Li,Yulong Liu,Liang Yao,Ping Lu,Bing Yang,Yuguang Ma,Yuguang Ma +10 more
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TLDR
In this article, a phenanthroimidazole-sulfone hybrid donor-acceptor (D-A) molecule with efficient deep blue emission has been reported, which has been proven to be an effective strategy to obtain high electroluminescence (EL) efficiency.Abstract:
Tremendous efforts have been devoted to develop efficient deep blue organic light-emitting diodes (OLEDs) materials with CIEy < 0.10 (Commission International de L’Eclairage (CIE)) and match the National Television System Committee (NTSC) standard blue CIE (x, y) coordinates of (0.14, 0.08) for display applications. However, deep blue fluorescent materials with an external quantum efficiency (EQE) over 5% are still rare. Herein, we report a phenanthroimidazole–sulfone hybrid donor–acceptor (D–A) molecule with efficient deep blue emission. D–A structure molecular design has been proven to be an effective strategy to obtain high electroluminescence (EL) efficiency. In general, charge transfer (CT) exciton formed between donor and acceptor is a weak coulomb bonded hole–electron pair and is favorable for the spin flip that can turn triplet excitons into singlet ones. However, the photoluminescence quantum yield (PLQY) of CT exciton is usually very low. On the other hand, a locally excited (LE) state normally ...read more
Citations
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Journal ArticleDOI
Recent Progress in High‐Efficiency Blue‐Light‐Emitting Materials for Organic Light‐Emitting Diodes
Yirang Im,Seong Yong Byun,Ji Han Kim,Dong Ryun Lee,Chan Seok Oh,Kyoung Soo Yook,Jun Yeob Lee +6 more
TL;DR: In this article, the authors summarized recent developments in blue fluorescent, phosphorescent and thermally activated delayed fluorescent emitters, and suggested key issues for each emitter and future development strategies.
Journal ArticleDOI
Deep Red Emissive Carbonized Polymer Dots with Unprecedented Narrow Full Width at Half Maximum
Junjun Liu,Yijia Geng,Daowei Li,Hua Yao,Zepeng Huo,Yunfeng Li,Kai Zhang,Shoujun Zhu,Haotong Wei,Weiqing Xu,Jinlan Jiang,Bai Yang +11 more
TL;DR: Deep red emissive carbonized polymer dots (CPDs) with unprecedented FWHM of 20 nm are synthesized and exhibit strong absorption and emission in the deep red light region, low toxicity, and good biocompatibility, making them an efficient probe for both one-photon and two- photon bioimaging.
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Recent progress in hot exciton materials for organic light-emitting diodes
TL;DR: A comprehensive review of the recent progress in hot exciton materials, which can effectively harness the non-radiative triplet excitons via reverse intersystem crossing (RISC) from high-lying triplet states to singlet states.
Journal ArticleDOI
Recent advances in organic light-emitting diodes: toward smart lighting and displays
TL;DR: In this paper, a review of light emission mechanisms of electroluminescent materials is presented, and a brief perspective on future research is also proposed for pursuing the commercialization of OLEDs.
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Efficient Nondoped Blue Fluorescent Organic Light‐Emitting Diodes (OLEDs) with a High External Quantum Efficiency of 9.4% @ 1000 cd m−2 Based on Phenanthroimidazole−Anthracene Derivative
Xiangyang Tang,Qing Bai,Tong Shan,Jinyu Li,Yu Gao,Futong Liu,Hui Liu,Qiming Peng,Bing Yang,Feng Li,Ping Lu +10 more
References
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Journal ArticleDOI
Management of singlet and triplet excitons for efficient white organic light-emitting devices
Yiru Sun,Noel C. Giebink,Hiroshi Kanno,Biwu Ma,Mark E. Thompson,Stephen R. Forrest,Stephen R. Forrest +6 more
TL;DR: This device challenges incandescent sources by exhibiting total external quantum and power efficiencies that peak at 18.7 ± 0.6 lm W-1, respectively, and two distinct modes of energy transfer within this device serve to channel nearly all of the triplet energy to the phosphorescent dopants, retaining the singlet energy exclusively on the blue fluorescent dopant.
Journal ArticleDOI
Recent Progresses on Materials for Electrophosphorescent Organic Light-Emitting Devices
TL;DR: Blue phosphorescence approaching the theoretical efficiency has also been achieved, which may overcome the final obstacle against the commercialization of full color display and white light sources from phosphorescent materials.
Journal ArticleDOI
Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes
Qisheng Zhang,Jie Li,Katsuyuki Shizu,Shuping Huang,Shuzo Hirata,Hiroshi Miyazaki,Chihaya Adachi +6 more
TL;DR: TADF has been characterized for a carbazole/sulfone derivative in both solutions and doped films and a pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density.