材料科学
磷光
有机发光二极管
深铬移
兴奋剂
重氮甲烷
八面体
蓝移
光化学
光电子学
光致发光
结晶学
晶体结构
光学
纳米技术
有机化学
化学
荧光
物理
图层(电子)
作者
Hea Jung Park,Jee‐Hun Jang,Jeong‐Hwan Lee,Do‐Hoon Hwang
标识
DOI:10.1021/acsami.2c06891
摘要
Compared to Ir(III) complexes with octahedral geometries, Pt(II) complexes with square planar geometries show superior optical properties because their flat shapes lead to an orientation that enhances the outcoupling of organic light-emitting diodes (OLEDs). However, the flat shapes of Pt(II) complexes typically induce a bathochromic shift, limiting their application in high-performance deep-blue phosphorescent OLEDs with high color purity. In this study, bulky trimethylsilyl (TMS)-substituted blue phosphorescent Pt(II) complex (PtON7-TMS) is successfully synthesized to improve color purity. The TMS substituent containing Si atom effectively suppresses intermolecular interaction and aggregation even when the complex concentration in the film state is higher than 30 wt %. As a result, the PtON7-TMS-based OLEDs exhibit a maximum external quantum efficiency of 21.4%, along with a pure-blue color of CIE (0.14, 0.09) at 20 wt % doping concentration and a full-width at half maximum of 30 nm. The pure blue color is maintained at a higher doping concentration (>30 wt %).
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