有机发光二极管
共发射极
材料科学
电致发光
溶解过程
光电子学
兴奋剂
咔唑
二极管
热稳定性
接受者
激子
光化学
图层(电子)
纳米技术
化学
有机化学
物理
量子力学
凝聚态物理
作者
Taweesak Sudyoadsuk,Sujinda Petdee,Pongsakorn Chasing,Pattarawadee Therdkatanyuphong,Chokchai Kaiyasuan,Wijitra Waengdongbung,Supawadee Namuangruk,Vinich Promarak
标识
DOI:10.1016/j.dyepig.2021.109712
摘要
Most highly efficient hybridized local and charge-transfer (HLCT)-based organic light‐emitting diodes (OLEDs) are multi-layer devices fabricated by thermal vacuum evaporation techniques, which are inappropriate for the simplified device fabrication process. However, there are only a couple of reported examples of solution-processed HLCT OLEDs, particularly deep-blue OLEDs. Herein, we design and synthesize a solution-processable HLCT emitter, CPPI, in which 1,2-diphenyl-phenanthroimidazole (PI) as an acceptor core is substituted by three 3,6-di-tert-butyl-N-phenyl-carbazole (CP) moieties as a donor and hole-transporting/solubilizing unit. The HLCT and photophysical properties are thoroughly examined by theoretical and experimental methods. CPPI exhibits HLCT characteristics with intense deep-blue color emission, high thermal and electrochemical stability, and decent hole-transporting ability. The molecule is successfully fabricated as a solution-processed non-doped emitter in organic light-emitting diodes (OLED). The solution-processed OLED retains efficient and stable deep-blue color emission (CIE coordinates of (0.157, 0.089)) with a narrow FWHM of 66 nm, an EQEmax of 3.39% and a high exciton utilization efficiency of 42.4%. Crucially, this result signifies an advance in developing a solution-processable HLCT molecule as an emitter for solution-processed non-doped OLEDs.
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