Boosting the efficiency of organic persistent room-temperature phosphorescence by intramolecular triplet-triplet energy transfer

被引：211
作者：
Zhao, Weijun [1 ,2 ,3 ]
Cheung, Tsz Shing [1 ,2 ,3 ]
Jiang, Nan [4 ]
Huang, Wenbin [4 ]
Lam, Jacky W. Y. [1 ,2 ,3 ,5 ]
Zhang, Xuepeng [1 ,2 ,3 ,5 ]
He, Zikai [4 ]
Tang, Ben Zhong [1 ,2 ,3 ,5 ,6 ]
机构：
[1] Chinese Natl Engn Res Ctr Tissue Restorat & Recon, Inst Mol Funct Mat, Hong Kong Branch, Dept Chem,Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China
[2] Hong Kong Univ Sci & Technol, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China
[3] Inst Adv Study, Kowloon, Clear Water Bay, Hong Kong 999077, Peoples R China
[4] Harbin Inst Technol, Sch Sci, HIT Campus Univ Town, Shenzhen 518055, Peoples R China
[5] HKUST Shenzhen Res Inst, 9 Yuexing 1st RD,Hi Tech Pk, Shenzhen 518055, Peoples R China
[6] South China Univ Technol, State Key Lab Luminescent Mat & Devices, SCUT HKUST Joint Res Inst, Ctr Aggregat Induced Emiss, Guangzhou 510640, Guangdong, Peoples R China
来源：
NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期
基金：
美国国家科学基金会;
关键词：
DUAL-EMISSION; ACHIEVING PERSISTENT; HOST-GUEST; METAL; AFTERGLOW; DESIGN; PHOTOLUMINESCENCE; MOLECULES; STATES;
D O I：
10.1038/s41467-019-09561-8
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Persistent luminescence is a fascinating phenomenon with exceptional applications. However, the development of organic materials capable of persistent luminescence, such as organic persistent room-temperature phosphorescence, lags behind for their normally low efficiency. Moreover, enhancing the phosphorescence efficiency of organic luminophores often results in short lifetime, which sets an irreconcilable obstacle. Here we report a strategy to boost the efficiency of phosphorescence by intramolecular triplet-triplet energy transfer. Incorpotation of (bromo) dibenzofuran or (bromo) dibenzothiophene to carbazole has boosted the intersystem crossing and provided an intramolecular triplet-state bridge to offer a near quantitative exothermic triplet-triplet energy transfer to repopulate the lowest triplet-state of carbazole. All these factors work together to contribute the efficient phosphorescence. The generation and transfer of triplet excitons within a single molecule is revealed by low-temperature spectra, energy level and lifetime investigations. The strategy developed here will enable the development of efficient phosphorescent materials for potential high-tech applications.
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页数：8
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