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High‐Performance Hybrid White OLEDs with Ultra‐Stable Emission Color and Small Efficiency Roll‐Off Achieved by Incorporating a Deep‐Blue Fluorescent Neat Film
Author(s) -
Wu Zilong,
Zhu Xiangyu,
Li Yinghao,
Chen Hao,
Zhuang Zeyan,
Shen Pingchuan,
Zeng Jiajie,
Chi Jiajin,
Ma Dongge,
Zhao Zujin,
Tang Ben Zhong
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202100298
Subject(s) - oled , electroluminescence , materials science , optoelectronics , quantum efficiency , thermal stability , diode , luminescence , fluorescence , layer (electronics) , nanotechnology , optics , chemistry , physics , organic chemistry
Organic blue luminescent materials play a vital role in the fabrication of full‐color displays and white lighting devices, but high‐efficiency blue emitters that meet commercial demands are still quite insufficient. Herein, the authors wish to report the design and synthesis of four bipolar deep‐blue luminogens consisting of an anthracene core and various functional groups. Their photophysical properties, electronic structures, electrochemical behavior, thermal stability, carrier transport ability, and electroluminescence performance are systematically studied. The nondoped organic light‐emitting diode (OLED) based on DPAC‐TAn‐BI radiates stable deep‐blue light [Commission Internationale de l'Eclairage (CIE x,y ) = 0.15, 0.15] with a high external quantum efficiency (η ext ) of 5.81%. Moreover, efficient two‐color hybrid warm white OLEDs are achieved using DPAC‐TAn‐BI neat film as a blue‐emitting layer, providing an excellent η ext of 27.6%, a small efficiency roll‐off of 2.9% at 1000 cd m −2 , and ultra‐stable emission spectra with tiny CIE x,y variation of (0.01, 0.01) from 100 to 10 000 cd m −2 . These results demonstrate that the deep‐blue luminogens are strong candidates for applications in blue and white OLEDs.