Improving Electron Mobility of Tetraphenylethene-Based AIEgens to Fabricate Nondoped Organic Light-Emitting Diodes with Remarkably High Luminance and Efficiency.
Robust light-emitting materials with strong solid-state fluorescence as well as fast and balanced carrier transporting ability are crucial to achieve high-performance organic light-emitting diodes (OLEDs). In this contribution, two linear tetraphenylethene (TPE) derivatives (TPE-TPAPBI and TPE-DPBI) that are functionalized with hole-transporting triphenylamine and/or electron-transporting 1,2-diphenyl-1H-benzimidazole groups are synthesized and fully characterized. Both TPE-TPAPBI and TPE-DPBI have aggregation-induced emission attributes and excellent photoluminescence quantum yields approaching 100% in vacuum deposited films. They also possess good thermal property, giving high decomposition temperatures (480 and 483 °C) and glass-transition temperatures (141 and 157 °C). TPE-TPAPBI and TPE-DPBI present high electron mobilities of 1.80 × 10(-5) and 1.30 × 10(-4) cm(2) V (-1) s(-1), respectively, at an electric field of 3.6 × 10(5) V cm(-1), which are comparable or even superior to that of 1,3,5-tri(1-phenylbenzimidazol-2-yl)benzene. The nondoped OLED device employing TPE-TPAPBI as active layer performs outstandingly, affording ultrahigh luminance of 125 300 cd m(-2), and excellent maximum external quantum, power and current efficiencies of 5.8%, 14.6 lm W(-1), and 16.8 cd A(-1), respectively, with very small roll-offs, demonstrating that TPE-TPAPBI is a highly promising luminescent material for nondoped OLEDs.
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.
Gengwei
G
Lin
Department of Electrical and Electronic Engineering, South University of Science and Technology of China , Shenzhen, Guangdong 518055, China.
Huiren
H
Peng
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.
Long
L
Chen
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.
Han
H
Nie
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.
Wenwen
W
Luo
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.
Yinghao
Y
Li
Department of Electrical and Electronic Engineering, South University of Science and Technology of China , Shenzhen, Guangdong 518055, China.
Shuming
S
Chen
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.
Rongrong
R
Hu
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.
Anjun
A
Qin
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.
Zujin
Z
Zhao
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.|Department of Chemistry, The Hong Kong University of Science & Technology , Clear Water Bay, Kowloon, Hong Kong, China.|Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong, China.
Ben Zhong
BZ
Tang
aggregation-induced emission; electroluminescence; electron mobility; organic light-emitting diodes; tetraphenylethene derivative