High-efficiency solution-processed OLED based on trivalent europium complex by modifying the composition of the multiple-host system

Xiaofang Li; Xiaofang Li; Jiaxuan Yin; Jiaxuan Yin; Jingyu Wang; Jingyu Wang; Ruixia Wu; Shuaibing Li; Shuaibing Li; Weidong Sun; Liang Zhou; Liang Zhou

doi:10.3389/fchem.2022.965927

Frontiers in Chemistry (Sep 2022)

High-efficiency solution-processed OLED based on trivalent europium complex by modifying the composition of the multiple-host system

Xiaofang Li,
Xiaofang Li,
Jiaxuan Yin,
Jiaxuan Yin,
Jingyu Wang,
Jingyu Wang,
Ruixia Wu,
Shuaibing Li,
Shuaibing Li,
Weidong Sun,
Liang Zhou,
Liang Zhou

Affiliations

Xiaofang Li: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
Xiaofang Li: School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, China
Jiaxuan Yin: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
Jiaxuan Yin: School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, China
Jingyu Wang: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
Jingyu Wang: School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, China
Ruixia Wu: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
Shuaibing Li: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
Shuaibing Li: School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, China
Weidong Sun: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
Liang Zhou: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
Liang Zhou: School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, China

DOI: https://doi.org/10.3389/fchem.2022.965927
Journal volume & issue: Vol. 10

Abstract

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In this work, di-[4-(N,N-ditolylamino)-phenyl]cyclohexane (TAPC); 4,4′,4″-tri (9-carbazoyl)triphenylamine (TcTa); 9-(4-tert-butylphenyl)-3,6-bis(triphenylsilyl)-9H-carbazole (CzSi); and 1,3,5-tri (m-pyrid-3-yl-phenyl)benzene (TmPyPB) were used to constitute the multiple-host system and fabricate solution-processed organic light-emitting diodes (s-OLEDs) with europium complex Eu(DBM)3Phen (DBM, 1,3-diphenylpropane-1,3-dione; Phen,1,10-phenanthroline) as emitter. In order to determine the optimal composition of the multiple-host system, a series of devices with different light-emitting layers (EMLs) were fabricated and compared. Experimental results revealed that removing TmPyPB out of the multiple-host system greatly reduces the turn-on voltage, whereas the addition of TcTa to the multiple-host system helps facilitate the transfer of holes from TAPC to Eu(DBM)3Phen molecules, thus increasing the recombination probability of carriers on emitter molecules. Finally, high performance solution-processed red OLED (turn-on voltage of 3.8 V) based on the europium complex doped multiple-host system obtained the maximum current efficiency of 2.07 cd A−1, power efficiency of 1.54 lm W−1, external quantum efficiency of 1.2%, and brightness of 945 cd m−2.

Published in Frontiers in Chemistry

ISSN: 2296-2646 (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Science: Chemistry
Website: http://journal.frontiersin.org/journal/chemistry

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