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
High Performance NIR OLEDs with Low Efficiency Roll-Off by Leveraging Os(II) Phosphors and Exciplex Co-Host
Ze-Lin Zhu,Jihua Tan,Wen-Cheng Chen,Wen-Cheng Chen,Yi Yuan,Li-Wen Fu,Chen Cao,Cheng-Ju You,Shao-Fei Ni,Yun Chi,Yun Chi,Chun-Sing Lee +11 more
Journal ArticleDOI
Symmetrical spirobi[xanthene] based locally asymmetrical phosphine oxide host for low-voltage-driven highly efficient white thermally activated delayed fluorescence diodes
TL;DR: In this paper, a symmetrical and orthogonal spirobi[xanthene] (SX) skeleton was constructed for full-thermally activated delayed fluorescence (TADF) white organic light-emitting diodes.
Journal ArticleDOI
Thermally Activated Delayed Fluorescent Dendrimers that Underpin High‐Efficiency Host‐Free Solution‐Processed Organic Light‐Emitting Diodes
Dianming Sun,Eimantas Duda,Xiao-Chun Fan,Rishabh Saxena,Jinghui Zhang,Sergey Bagnich,Xiaohong Zhang,Anna Köhler,Eli Zysman-Colman +8 more
TL;DR: In this paper , the design, synthesis, density functional theory (DFT) modeling, and photophysics of three triazine-based dendrimers, tBuCz2pTRZ, tBz2mTRZ and tBZ2m2p TRZ, are reported, which resolve the conflicting requirements of achieving simultaneously a small ΔEST and a large oscillator strength by incorporating both meta-and paraconnected donor dendrons about a central triazine acceptor.
Journal ArticleDOI
A sky-blue thermally activated delayed fluorescence emitter based on multimodified carbazole donor for efficient organic light-emitting diodes
Xiang-Dong Zhu,Qi-Sheng Tian,Qi Zheng,Xu-Cheng Tao,Yi Yuan,You-Jun Yu,Yun Li,Zuo-Quan Jiang,Liang-Sheng Liao +8 more
TL;DR: In this paper, a sky-blue thermally activated delayed fluorescent (TADF) emitter based on 2-(9H-carbazol-9-yl)-7,7-dimethyl-5,7dihydroindeno[2,1-b] carbazole (DCF) as donor and 2,4-diphenyl-1,3,5-triazine as acceptor was developed.
Journal ArticleDOI
Feasible structure-modification strategy for inhibiting aggregation-caused quenching effect and constructing exciton conversion channels in acridone-based emitters
Qing Wan,Bing Zhang,Jialin Tong,Yin Li,Haozhong Wu,Han Zhang,Zhiming Wang,Zhiming Wang,Yuyu Pan,Ben Zhong Tang,Ben Zhong Tang +10 more
TL;DR: The results confirmed the feasibility of this structure modification strategy to simultaneously inhibit the ACQ effect and construct excitons conversion channels.
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
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
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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.