Stable organic light-emitting diodes based on thioxanthone derivative with shortened photoluminescence delayed lifetime

被引：4

作者：

Li, Zhiyi ^{[1
,2
,3
]}

Wei, Xiaofang ^{[1
,2
,3
]}

Yi, Yuanping ^{[4
]}

Wang, Pengfei ^{[1
,2
,3
]}

Wang, Ying ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Photochem Convers & Optoelect Mat, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Tech Inst Phys & Chem, CityU CAS Joint Lab Funct Mat & Devices, Beijing 100190, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[4] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Key Lab Organ Solids, Beijing 100190, Peoples R China

来源：

ORGANIC ELECTRONICS | 2022年 / 104卷

基金：

中国国家自然科学基金;

关键词：

Thermally activated delayed fluorescence; Device lifetime; Thioxanthone; Organic light emitting diodes; EFFICIENCY ROLL-OFF; HIGHLY EFFICIENT; FLUORESCENCE MATERIALS; EMISSION;

D O I：

10.1016/j.orgel.2022.106490

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The device stability of the devices based on thermally active delayed fluorescence is still unsatisfactory, although their efficiencies of the reported devices have reached those of phosphorescent emitters for application. Reducing the triplet related nonradiative process is the most efficient method to enhance the device stability. In this work, we designed and synthesized a TADF molecule 4,5-TXO-PhCz with a reduced delayed fluorescence lifetime of only 11.3 mu s. Based on this molecule, the OLED device can reach a maximum EQE of 18.6% with a low efficiency roll-off, the device can even retain 9.38% at luminescence of 5000 cd/m(2). The short PL delayed lifetime suppressed the triplet-related nonradiative annihilation and reduced the efficiency roll-off, affording an excellent device stability with a half lifetime of 380 h. These results indicate that reducing the delayed fluorescence lifetime can effectively reduce the device efficiency roll-off and improve the device stability.

引用

页数：6

共 40 条

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