The Second Excited Triplet-State Facilitates TADF and Triplet-Triplet Annihilation Photon Upconversion via a Thermally Activated Reverse Internal Conversion

被引：12

作者：

Zhao, Yanliang ^{[1
]}

Wu, Yingnan ^{[1
]}

Chen, Wenlong ^{[2
,3
]}

Zhang, Ruiling ^{[1
]}

Hong, Gaobo ^{[2
]}

Tian, Jiarui ^{[1
]}

Wang, Honglei ^{[1
]}

Zheng, Daoyuan ^{[1
]}

Wu, Chenyu

Jiang, Xiao ^{[4
]}

Huo, Xinming ^{[5
]}

Sun, Lei ^{[1
]}

Deng, Weiqiao ^{[1
,6
]}

Han, Keli ^{[1
,6
]}

Song, Fengling ^{[1
,2
]}

机构：

[1] Shandong Univ, Inst Mol Sci & Engn, Inst Frontier & Interdisciplinary Sci, Qingdao 266237, Shandong, Peoples R China

[2] Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China

[3] Shandong Univ, Inst Frontier & Interdisciplinary Sci, Qingdao Inst Theoret & Computat Sci, Qingdao 266237, Shandong, Peoples R China

[4] Dalian Univ Technol, Key Lab Ind Ecol & Environm Engn MOE, Sch Environm Sci & Technol, Dalian 116024, Peoples R China

[5] Tsinghua Univ, Div Adv Mfg, Tsinghua Shenzhen Int Grad Sch, Shenzhen 518055, Peoples R China

[6] Chinese Acad Sci, State Key Lab Mol React Dynam, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

来源：

ADVANCED OPTICAL MATERIALS | 2022年 / 10卷 / 06期

基金：

中国国家自然科学基金;

关键词：

conical intersection; pure organic photosensitizers; reverse intersystem crossing; thermally activated delayed fluorescence; triplet-triplet annihilation photon upconversion; ROOM-TEMPERATURE PHOSPHORESCENCE; LIGHT-EMITTING-DIODES; DELAYED FLUORESCENCE MOLECULES; BASIS-SETS; CHARGE-TRANSFER; ENERGY; SINGLET; IMPLEMENTATION; DERIVATIVES; EFFICIENCY;

D O I：

10.1002/adom.202102275

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recent years have seen a surge in organic emitters that exhibit thermally activated delayed fluorescence (TADF) behavior owing to their high exciton utilization efficiency, low biological toxicity, etc. However, the existing TADF channel is insufficiently well developed as to design high-performance materials especially in the high-lying triplet state mediated reverse intersystem crossing process. A thermally activated reverse internal conversion (TARIC) pathway is reported here, which can achieve effective population transfer from T-1 to T-2 states via conical intersection point with the barrier of 3.81 kcal mol(-1). On this basis, the mediated T-2 state facilitates the TADF and triplet-triplet annihilation photon upconversion (TTA-UC) channel. Furthermore, benefited from the TARIC pathway, the designed 2 ',7 '-dichlorofluorescein (DCF) derivative DCF-MPYM-Me photosensitizer presents an excellent upconversion efficiency of 13.6%. The high upconversion efficiency is the best performance in purely organic TADF photosensitizers without heavy atoms in TTA-UC systems.

引用

页数：8

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