有机发光二极管
共发射极
材料科学
光电子学
接受者
偶极子
量子效率
半最大全宽
电致发光
跃迁偶极矩
物理
纳米技术
凝聚态物理
量子力学
图层(电子)
作者
Hyoungcheol Lim,Hyung Jin Cheon,Seung‐Je Woo,Soon‐Ki Kwon,Yun‐Hi Kim,Jang‐Joo Kim
标识
DOI:10.1002/adma.202004083
摘要
New blue (DBA-SAB) and deep-blue (TDBA-SAF) thermally activated delayed fluorescence (TADF) emitters are synthesized for blue-emitting organic-light emitting diodes (OLEDs) by incorporating spiro-biacridine and spiro-acridine fluorene donor units with an oxygen-bridged boron acceptor unit, respectively. The molecules show blue and deep-blue emission because of the deep highest occupied molecular energy levels of the donor units. Besides, both emitters exhibit narrow emission spectra with the full-width at half maximum (FWHM) of less than 65 nm due to the rigid donor and acceptor units. In addition, the long molecular structure along the transition dipole moment direction results in a high horizontal emitting dipole ratio over 80%. By combining the effects, the OLED utilizing DBA-SAB as the emitter exhibits a maximum external quantum efficiency (EQE) of 25.7% and 1931 Commission Internationale de l'éclairage (CIE) coordinates of (0.144, 0.212). Even a higher efficiency deep blue TADF OLED with a maximum EQE of 28.2% and CIE coordinates of (0.142, 0.090) is realized using TDBA-SAF as the emitter.
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