首页|Phosphonium-Based Ionic Thermally Activated Delayed Fluorescence Emitters for High-Performance Partially Solution-Processed Organic Light-Emitting Diodes

Phosphonium-Based Ionic Thermally Activated Delayed Fluorescence Emitters for High-Performance Partially Solution-Processed Organic Light-Emitting Diodes

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Ionic thermally activated delayed fluorescence(TADF)emitters are rarely investigated due to their poor photoluminescence and electroluminescence performance.Herein,highly efficient ionic TADF emitters with charged donor-acceptor(D-A+)and D-A+-D architectures are designed,innovatively based on the phosphonium cation electron acceptor.The symmetric D-A+-D compound in doped film exhibits a high photoluminescence quantum yield of 0.91 and a short emission lifetime of 1.43 microse-conds.Partially solution-processed organic light-emitting diodes based on these ionic TADF emitters achieve a maximum external quantum efficiency(EQE)of 18.3％and a peak luminance of 14,532 can-delas per square meter(cd/m2)and show a small efficiency roll-off of 7.1％(EQE=17％)at a practical high luminance of 1000 cd/m2.These results demon-strate the high potential of phosphonium cations as promising electron acceptors to construct TADF emitters for high-performance electroluminescence devices.The current study opens up an appealing way for future exploitation of high-efficiency ionic TADF materials.

cation acceptorcharge transferphos-phoniumionic emitterthermally activated delayed fluorescencepartially solution-processedhost-guestorganic light-emitting diodeefficiency roll-off

Xu-Lin Chen、Xiao-Dong Tao、Ya-Shu Wang、Zhuangzhuang Wei、Lingyi Meng、Dong-Hai Zhang、Fu-Lin Lin、Can-Zhong Lu

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State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,Fujian 350002

Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials,Xiamen Institute of Rare Earth Materials,Haixi Institutes,Chinese Academy of Sciences,Xiamen,Fujian 361021

Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou,Fujian 350108

Key Research Program of Frontier Science,the Chinese Academy of Sciences(CAS)国家自然科学基金福建省自然科学基金Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of ChinaFujian Science and Technology Innovation Laboratory for Optoelectronic Information of ChinaYouth Innovation Foundation of Xiamen CityYouth Innovation Foundation of Xiamen CityMajor Research Project of Xiamen

QYZDJ-SSW-SLH033520732862006L20052021ZR1322021ZZ1153502Z202060823502Z202060833502Z20191015

2023

10.31635/ccschem.022.202202145

中国化学会会刊(英文)

中国化学会会刊(英文)

CSCD
ISSN：
年,卷(期)：2023.5(3)
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