Journal ArticleDOI
Over 10% EQE Near-Infrared Electroluminescence Based on a Thermally Activated Delayed Fluorescence Emitter
Yi Yuan,Yun Hu,Ye-Xin Zhang,Jiu-Dong Lin,Ya-Kun Wang,Zuo-Quan Jiang,Liang-Sheng Liao,Shuit-Tong Lee +7 more
TLDR
In this article, a wedge-shaped Dπ-A-π-D emitter with thermally activated delayed fluorescence property and a small single-triplet splitting (ΔEst) of 0.14 eV is presented.Abstract:
Significant effort has been made to develop novel material systems to improve the efficiency of near-infrared organic light-emitting diodes (NIR OLEDs). Of those, fluorescent chromophores are mostly studied because of their advantages in cost and tunability. However, it is still rare for fluorescent NIR emitters to present good color purities in the NIR range and to have high external quantum efficiency (EQE). Here, a wedge-shaped D-π-A-π-D emitter APDC-DTPA with thermally activated delayed fluorescence property and a small single-triplet splitting (ΔEst) of 0.14 eV is presented. The non-doped NIR device exhibits excellent performance with a maximum EQE of 2.19% and a peak wavelength of 777 nm. Remarkably, when 10 wt% of APDC-DTPA is doped in 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene host, an extremely high EQE of 10.19% with an emission peak of 693 nm is achieved. All these values represent the best result for NIR OLEDs based on a pure organic fluorescent emitter with similar device structure and color gamut.read more
Citations
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Journal ArticleDOI
Red/Near-Infrared Thermally Activated Delayed Fluorescence OLEDs with Near 100 % Internal Quantum Efficiency.
Jia Xiong Chen,Jia Xiong Chen,Wen Wen Tao,Wen-Cheng Chen,Yafang Xiao,Kai Wang,Chen Cao,Jia Yu,Shengliang Li,Feng Xia Geng,Chihaya Adachi,Chun-Sing Lee,Xiaohong Zhang +12 more
TL;DR: Two novel red emitters, BPPZ-PXZ and mDPBPZ- PXZ, with highly twisted donor-acceptor structures are designed and synthesized to study molecular design strategies of high-efficiency red TADF emitter for different applications and show leading performances among respectively doped red TadF OLEDs and non-doped deep red/NIR ones.
Journal ArticleDOI
High-Efficiency Red Organic Light-Emitting Diodes with External Quantum Efficiency Close to 30% Based on a Novel Thermally Activated Delayed Fluorescence Emitter.
Yuan-Lan Zhang,Quan Ran,Qiang Wang,Yuan Liu,Christian Hänisch,Sebastian Reineke,Jian Fan,Liang-Sheng Liao +7 more
TL;DR: Based on the superior properties of TPA-PZCN, red, deep-red, and near-infrared OLEDs are fabricated by utilizing different device structure strategies, and an exciplex-forming cohost strategy is adopted.
Journal ArticleDOI
Recent Progress of Highly Efficient Red and Near-Infrared Thermally Activated Delayed Fluorescent Emitters
Journal ArticleDOI
High-Performance Non-doped OLEDs with Nearly 100 % Exciton Use and Negligible Efficiency Roll-Off
TL;DR: By grafting 4-(phenoxazin-10-yl)benzoyl to common host materials, a series of new luminescent materials with prominent AIDF property are developed, which are the most efficient non-doped OLEDs reported so far.
References
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Highly efficient organic light-emitting diodes from delayed fluorescence
Hiroki Uoyama,Kenichi Goushi,Kenichi Goushi,Katsuyuki Shizu,Hiroko Nomura,Chihaya Adachi,Chihaya Adachi +6 more
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Journal ArticleDOI
Sky-Blue Organic Light Emitting Diode with 37% External Quantum Efficiency Using Thermally Activated Delayed Fluorescence from Spiroacridine-Triazine Hybrid.
Ting-An Lin,Tanmay Chatterjee,Wei-Lung Tsai,Wei-Kai Lee,Meng-Jung Wu,Min Jiao,Kuan-Chung Pan,Chih-Lung Yi,Chin-Lung Chung,Ken-Tsung Wong,Chung-Chih Wu +10 more
TL;DR: Extremely efficient sky-blue organic electroluminescence with external quantum efficiency of ≈37% is achieved in a conventional planar device structure using a highly efficient thermally activated delayed fluorescence emitter based on the spiroacridine-triazine hybrid.
Journal ArticleDOI
Anthraquinone-Based Intramolecular Charge-Transfer Compounds: Computational Molecular Design, Thermally Activated Delayed Fluorescence, and Highly Efficient Red Electroluminescence
Qisheng Zhang,H. Kuwabara,William J. Potscavage,Shuping Huang,Yasuhiro Hatae,Takumi Shibata,Chihaya Adachi +6 more
TL;DR: It is demonstrated that increasing the distance between donor (D) and acceptor (A) in intramolecular-charge-transfer molecules is a promising strategy for simultaneously achieving small ΔE(ST) and large k(F), which is in good agreement with those predicted by corrected time-dependent density functional theory.
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Near‐Infrared Organic Compounds and Emerging Applications
Gang Qian,Zhi Yuan Wang +1 more
TL;DR: This Focus Review describes the emerging class of near-infrared (NIR) organic compounds containing the conjugated polyene, polymethine, and donor-acceptor chromophores and exploration of their NIR-absorbing, Nir-fluorescence, and N IR-photosensitizing properties for potential applications in heat absorbers, solar cells, andNIR light-emitting diodes.