《High-Performance Ultraviolet Organic Light-Emitting Diode Enabled by High-Lying Reverse Intersystem Crossing》 was written by Zhang, Han; Li, Ganggang; Guo, Xiaomin; Zhang, Kai; Zhang, Bing; Guo, Xuecheng; Li, Yuxuan; Fan, Jianzhong; Wang, Zhiming; Ma, Dongge; Tang, Ben Zhong. Formula: C7H4FNThis research focused onUV organic emitter light emitting diode color purity; OLEDs; UV emission; hybridized local and charge-transfer state; record-high EQE; reverse intersystem crossing. The article conveys some information:
UV organic emitters that can open up applications for future organic light-emitting diodes (OLEDs) are of great value but rarely developed. Here, we report a high-quality UV emitter with hybridized local and charge-transfer (HLCT) excited state and its application in UV OLEDs. The UV emitter, 2BuCz-CNCz, shows the features of low-lying locally excited (LE) emissive state and high-lying reverse intersystem crossing (hRISC) process, which helps to balance the color purity and exciton utilization of UV OLED. Consequently, the OLED based on 2BuCz-CNCz exhibits not only a desired narrowband UV electroluminescent (EL) at 396 nm with satisfactory color purity (CIEx, y=0.161, 0.031), but also a record-high maximum external quantum efficiency (EQE) of 10.79 % with small efficiency roll-off. The state-of-the-art device performance can inspire the design of UV emitters, and pave a way for the further development of high-performance UV OLEDs. In the part of experimental materials, we found many familiar compounds, such as 4-Fluorobenzonitrile(cas: 1194-02-1Formula: C7H4FN)
4-Fluorobenzonitrile(cas: 1194-02-1) is used as chemical intermediate, solvent for perfumes and pharmaceuticals, stabilizer for chlorinated solvents, HPLC analysis, catalyst and component of transition-metal complex catalysts.Formula: C7H4FN
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts