Highly Efficient Thermally Activated Delayed Fluorescence via J-Aggregates with Strong Intermolecular Charge Transfer

被引:314
作者
Xue, Jie [1 ,2 ]
Liang, Qingxin [1 ]
Wang, Rui [1 ]
Hou, Jiayue [1 ]
Li, Wenqiang [1 ]
Peng, Qian [3 ]
Shuai, Zhigang [1 ]
Qiao, Juan [1 ,2 ]
机构
[1] Tsinghua Univ, Dept Chem, Minist Educ, Key Lab Organ Optoelect & Mol Engn, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Ctr Flexible Elect Technol, Beijing 100084, Peoples R China
[3] Chinese Acad Sci, Key Lab Organ Solids, Inst Chem, Beijing 100190, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
intermolecular charge transfer; J-aggregates; near-infrared emission; organic light-emitting diodes; thermally activated delayed fluorescence; LIGHT-EMITTING-DIODES; AMPLIFIED SPONTANEOUS EMISSION; ELECTROLUMINESCENCE; SPECTRA; STATES; RED;
D O I
10.1002/adma.201808242
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The development of high-efficiency and low-cost organic emissive materials and devices is intrinsically limited by the energy-gap law and spin statistics, especially in the near-infrared (NIR) region. A novel design strategy is reported for realizing highly efficient thermally activated delayed fluorescence (TADF) materials via J-aggregates with strong intermolecular charge transfer (CT). Two organic donor-acceptor molecules with strong and planar acceptor are designed and synthesized, which can readily form J-aggregates with strong intermolecular CT in solid states and exhibit wide-tuning emissions from yellow to NIR. Experimental and theoretical investigations expose that the formation of such J-aggregates mixes Frenkel excitons and CT excitons, which not only contributes to a fast radiative decay rate and a slow nonradiative decay rate for achieving nearly unity photoluminescence efficiency in solid films, but significantly decreases the energy gap between the lowest singlet and triplet excited states (approximate to 0.3 eV) to induce high-efficiency TADF even in the NIR region. These organic light-emitting diodes exhibit external quantum efficiencies of 15.8% for red emission and 14.1% for NIR emission, which represent the best result for NIR organic light-emitting diodes (OLEDs) based on TADF materials. These findings open a new avenue for the development of high-efficiency organic emissive materials and devices based on molecular aggregates.
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页数:9
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