Li Yinghao, Xu Zeng, Zhu Xiangyu, Chen Bin, Wang Zhiming, Xiao Biao, Lam Jacky W Y, Zhao Zujin, Ma Dongge, Tang Ben Zhong
State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission , South China University of Technology , Guangzhou 510640 , China.
Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering , Jianghan University , Wuhan 430056 , China.
ACS Appl Mater Interfaces. 2019 May 15;11(19):17592-17601. doi: 10.1021/acsami.9b03177. Epub 2019 May 3.
Organic blue luminescent materials are essential for organic light-emitting diodes (OLEDs). However, high-quality blue materials that can fulfill the requirements of OLED commercialization are much rare. Herein, two novel blue luminogens, 9-(4-(2,6-di- tert-butyl-10-(4-(1,2,2-triphenylvinyl)phenyl)anthracen-9-yl)phenyl)-9 H-carbazole and 9-(4-(2,6-di- tert-butyl-10-(4-(1,2,2-triphenylvinyl)phenyl)anthracen-9-yl)1,3-di(9 H-carbazol-9-yl)benzene (TPE-TADC), consisting of anthracene, tetraphenylethene, and carbazole groups are successfully prepared, and their thermal, optical, electronic, and electrochemical properties are fully investigated. They exhibit prominent aggregation-induced emission property and strong blue fluorescence at ∼455 nm in neat films. Efficient nondoped OLEDs are fabricated with these blue luminogens, providing blue electroluminescence (EL) at 451 nm (CIE = 0.165, 0.141) and high EL efficiencies of 6.81 cd A, 6.57 lm W, and 5.71%. By utilizing TPE-TADC as a blue emissive layer, high-performance two-color hybrid white OLEDs are achieved, furnishing modulatable light color from pure white (CIE = 0.33, 0.33) to warm white (CIE = 0.44, 0.46) and excellent EL efficiencies of 56.7 cd A, 55.2 lm W, and 19.2%. More importantly, these blue and white OLEDs all display ultrahigh color and efficiency stabilities at high luminance, indicating the great potential of these blue luminogens for the application in OLED displays and white illumination.
有机蓝色发光材料对于有机发光二极管（OLED）至关重要。然而，能够满足OLED商业化要求的高质量蓝色材料却极为罕见。在此，成功制备了两种新型蓝色发光体，即9-(4-(2,6-二叔丁基-10-(4-(1,2,2-三苯基乙烯基)苯基)蒽-9-基)苯基)-9H-咔唑和9-(4-(2,6-二叔丁基-10-(4-(1,2,2-三苯基乙烯基)苯基)蒽-9-基)1,3-二(9H-咔唑-9-基)苯（TPE-TADC），它们由蒽、四苯乙烯和咔唑基团组成，并对其热、光、电子和电化学性质进行了全面研究。它们在纯薄膜中表现出显著的聚集诱导发光特性，并在约455 nm处发出强烈的蓝色荧光。用这些蓝色发光体制备了高效的非掺杂OLED，在451 nm处提供蓝色电致发光（EL）（CIE = 0.165, 0.141），EL效率高达6.81 cd/A、6.57 lm/W和5.71%。通过使用TPE-TADC作为蓝色发射层，实现了高性能的双色混合白色OLED，提供了从纯白色（CIE = 0.33, 0.33）到暖白色（CIE = 0.44, 0.46）的可调制光色，以及56.7 cd/A、55.2 lm/W和19.2%的优异EL效率。更重要的是，这些蓝色和白色OLED在高亮度下均显示出超高的颜色和效率稳定性，表明这些蓝色发光体在OLED显示器和白色照明应用中具有巨大潜力。
