有机发光二极管
共发射极
电致发光
光电子学
兴奋剂
材料科学
荧光
蓝移
二极管
溶剂化
电效率
光致发光
化学
光学
功率(物理)
纳米技术
分子
物理
有机化学
量子力学
图层(电子)
作者
Youwen Deng,Mo Chen,Liwei Mao,Jinjiang Wang,Liezun Chen,Liya Zhong,Ying Zhu,Zui Liu,Jianxin Tang
标识
DOI:10.1016/j.jlumin.2022.119443
摘要
Emission spectral shift has a significant influence on the color purity of organic light-emitting diodes (OLEDs) for the applications in full-color displays and solid-state lighting. However, the controllable shift of the emission spectra from one color to another provides a promising method to solve the problem in high-performance blue emitters. Here, we demonstrate the tunable emission colors from green to blue with the use of a green emitter of 2,4,5,6-tetrakis(carbazol-9-yl)-1,3-dicyanobenzene (4CzIPN) with different doping concentrations. Upon an optimal 4CzIPN doping concentration of 1 wt%, the OLED achieves a blue emission at 488 nm with the maximum current efficiency of 41.69 cd/A, the maximum power efficiency of 43.66 lm/W, and Commission International de I'Eclairage (CIE) coordinates of (0.19, 0.39). By investigating the factors of the polarity of the host materials and the use of electron-transport layers, it has been clarified that the electroluminescence spectral shift arises from the synergistical effects of solid-state solvation and microcavity. These findings pave the way for the development of high-efficiency blue OLEDs without blue materials.
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