High Efficiency and Long Lifetime of a Fluorescent Blue-Light Emitter Made of a Pyrene Core and Optimized Side Groups

ACS Applied Materials & Interfaces
Hyocheol JungJongwook Park

Abstract

In this study, four emitters of blue light are synthesized by selecting pyrene with its high photoluminescence quantum yield (PLQY) as the core group and variants of the electron-donating diphenylamine (DPA) as side groups. The four compounds have different numbers, sizes, and substitution positions of alkyl groups on the DPA. Each of the four compounds when doped in OLED devices shows a high current efficiency (CE) of over 7 cd A-1 and a high external quantum efficiency (EQE) of over 7.5%. In addition, the compounds yield electroluminescence (EL) spectra showing peaks with narrow full width at half-maximum (fwhm) values of 37-40 nm and hence indicative of high color purity. Moreover, one compound N1,N6-bis(5-( tert-butyl)-2-methylphenyl)-N1,N6-bis(2,4-dimethylphenyl)pyrene-1,6-diamine (3Me-1Bu-TPPDA), shows a very high EQE of 9.25% and a very long lifetime with an LT95 of 471 h.

References

Oct 9, 2009·The Journal of Organic Chemistry·Kyung-Ryang WeeSang Ook Kang
Nov 20, 2012·Chemistry, an Asian Journal·Zhengfeng ChangHuayu Qiu
Feb 12, 2017·ACS Applied Materials & Interfaces·Wen-Cheng ChenChun-Sing Lee
Jun 27, 2017·The Journal of Organic Chemistry·Chuan-Zeng WangTakehiko Yamato
Nov 2, 2017·ACS Applied Materials & Interfaces·Zhao ChenWai-Yeung Wong

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Citations

Jan 14, 2021·Advanced Science·Sujith Sudheendran SwayamprabhaJwo-Huei Jou
Feb 22, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Kumar KrishnaveniAlagarsamy Mathavan
Oct 28, 2021·ACS Applied Materials & Interfaces·Yumeng ChenWei Huang

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