有机发光二极管
电致发光
材料科学
激发态
光电子学
激子
光致发光
兴奋剂
二极管
磷光
量子效率
荧光
图层(电子)
光学
原子物理学
纳米技术
凝聚态物理
物理
作者
Baoxi Li,Ganggang Li,Han Zhang,Haozhong Wu,Kongqi Chen,Zhiming Wang,Ben Zhong Tang
标识
DOI:10.1002/adom.202101724
摘要
Abstract For organic light‐emitting diodes (OLEDs), the characteristics of high‐lying excited states of pure organic materials significantly affect the utilization of triplet excitons, which are critical in the process of electroluminescence. Herein, two novel molecules, PT‐1 and PT‐2, with deep‐blue emission are obtained, which exhibit nearly identical photophysical behavior in the photoluminescence process. However, the remarkable distinction in the characteristics of the high‐lying triplet excited states between PT‐1 and PT‐2 leads to a significant difference in the electroluminescence performance. Moreover, the non‐doped OLED based on PT‐1 exhibits maximum external quantum efficiency (η ext ) of 6.63% with a low efficiency roll‐off. In addition, the authors employ PT‐1 as the phosphorescent host materials to fabricate two‐color hybrid white OLEDs (WOLEDs), from which they can realize the transformation from warm‐white to quasi‐white light by tuning the thickness of emission layer, with maximum η ext and power efficiency (η p ) of 23.93%/84.37 lm W −1 and 10.49%/33.96 lm W −1 , respectively. These results deeply demonstrate the effects of high‐lying excited states on electroluminescence and facilitate the preparation of functional OLEDs.
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