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Manipulation of Charge and Exciton Distribution Based on Blue Aggregation‐Induced Emission Fluorophors: A Novel Concept to Achieve High‐Performance Hybrid White Organic Light‐Emitting Diodes
Author(s) -
Liu Baiquan,
Nie Han,
Zhou Xingbang,
Hu Shiben,
Luo Dongxiang,
Gao Dongyu,
Zou Jianhua,
Xu Miao,
Wang Lei,
Zhao Zujin,
Qin Anjun,
Peng Junbiao,
Ning Honglong,
Cao Yong,
Tang Ben Zhong
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201503368
Subject(s) - oled , materials science , optoelectronics , diode , exciton , luminance , quenching (fluorescence) , aggregation induced emission , blue light , deep blue , optics , nanotechnology , chemistry , fluorescence , photochemistry , physics , layer (electronics) , quantum mechanics
The aggregation‐induced emission (AIE) phenomenon is important in organic light‐emitting diodes (OLEDs), for it can potentially solve the aggregation‐caused quenching problem. However, the performance of AIE fluorophor‐based OLEDs (AIE OLEDs) is unsatisfactory, particularly for deep‐blue devices (CIEy < 0.15). Here, by enhancing the device engineering, a deep‐blue AIE OLED exhibits low voltage (i.e., 2.75 V at 1 cd m −2 ), high luminance (17 721 cd m −2 ), high efficiency (4.3 lm W −1 ), and low efficiency roll‐off (3.6 lm W −1 at 1000 cd m −2 ), which is the best deep‐blue AIE OLED. Then, blue AIE fluorophors, for the first time, have been demonstrated to achieve high‐performance hybrid white OLEDs (WOLEDs). The two‐color WOLEDs exhibit i) stable colors and the highest efficiency among pure‐white hybrid WOLEDs (32.0 lm W −1 ); ii) stable colors, high efficiency, and very low efficiency roll‐off; or iii) unprecedented efficiencies at high luminances (i.e., 70.2 cd A −1 , 43.4 lm W −1 at 10 000 cd m −2 ). Moreover, a three‐color WOLED exhibits wide correlated color temperatures (10 690–2328 K), which is the first hybrid WOLED showing sunlight‐style emission. These findings will open a novel concept that blue AIE fluorophors are promising candidates to develop high‐performance hybrid WOLEDs, which have a bright prospect for the future displays and lightings.