Achieving Pure Green Electroluminescence with CIEy of 0.69 and EQE of 28.2% from an Aza-Fused Multi-Resonance Emitter

Yuewei Zhang; Dongdong Zhang; Jinbei Wei; Xiangchen Hong; Yang Lu; Deping Hu; Guomeng Li; Ziyang Liu; Yang Chen; Lian Duan

doi:10.1002/anie.202008264

Achieving Pure Green Electroluminescence with CIEy of 0.69 and EQE of 28.2% from an Aza-Fused Multi-Resonance Emitter

Angew Chem Int Ed Engl. 2020 Sep 28;59(40):17499-17503. doi: 10.1002/anie.202008264. Epub 2020 Aug 11.

Authors

Yuewei Zhang^{1

2}, Dongdong Zhang¹, Jinbei Wei³, Xiangchen Hong¹, Yang Lu^{1

2}, Deping Hu¹, Guomeng Li¹, Ziyang Liu¹, Yang Chen¹, Lian Duan^{1

2}

Affiliations

¹ Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, China.
² Center for Flexible Electronics Technology, Tsinghua University, Beijing, 100084, P. R. China.
³ Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100049, P. R. China.

PMID: 32618031
DOI: 10.1002/anie.202008264

Abstract

Pure green emitters are essential for realizing an ultrawide color gamut in next-generation displays. Herein, by fusing the difficult-to-access aza-aromatics onto B (boron)-N (nitrogen) skeleton, a hybridized multi-resonance and charge transfer (HMCT) molecule AZA-BN was successfully synthesized through an effective one-shot multiple cyclization method. AZA-BN shows pure green fluorescence with photoluminance quantum yield of 99.7 %. The corresponding green device exhibits a maximum external quantum efficiency and power efficiency of 28.2 % and 121.7 lm W^-1 , respectively, with a full width half maximum (FWHM) of merely 30 nm and Commission Internationale de l'Eclairage (CIE) coordinate y of 0.69, representing the purest green bottom-emitting organic light-emitting diode.

Keywords: electroluminiscence; fused aza-aromatics; hybridized multi-resonance and charge transfer; pure green emission.

Abstract

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