Rao Jiancheng, Zhao Chenyang, Wang Yanping, Bai Keyan, Wang Shumeng, Ding Junqiao, Wang Lixiang
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
ACS Omega. 2019 Jan 23;4(1):1861-1867. doi: 10.1021/acsomega.8b03296. eCollection 2019 Jan 31.
A deep-blue thermally activated delayed fluorescence (TADF) emitter TXADO-spiro-DMACF has been reported for nondoped organic light-emitting diodes (OLEDs) by integrating an appropriate blocking unit with the donor (D)-acceptor (A)-donor (D)-type TADF emitter via a spiro linkage. Benefiting from the characteristic perpendicular arrangement, the intermolecular interactions are expected to be weakened to some degree. As a result, TXADO-spiro-DMACF shows a very small bathochromic shift of 8 nm associated with a narrowed full width at half maximum of 54 nm on going from solution to the film. The corresponding nondoped device successfully achieves a bright deep-blue emission, revealing Commission Internationale de l'Eclairage coordinates of (0.16, 0.09) and a peak external quantum efficiency of 5.3% (5.3 cd/A, 5.9 lm/W). The results clearly indicate that spiro-blocking is a promising strategy to develop deep-blue TADF emitters capable of nondoped OLEDs.
通过将合适的阻挡单元与供体（D）-受体（A）-供体（D）型热激活延迟荧光（TADF）发射体TXADO-spiro-DMACF经由螺环连接整合，已报道了用于非掺杂有机发光二极管（OLED）的深蓝色TADF发射体。受益于特征性的垂直排列，分子间相互作用有望在一定程度上减弱。结果，TXADO-spiro-DMACF从溶液到薄膜时显示出非常小的8 nm红移，半高宽变窄至54 nm。相应的非掺杂器件成功实现了明亮的深蓝色发射，显示出国际照明委员会坐标为（0.16, 0.09），峰值外量子效率为5.3%（5.3 cd/A，5.9 lm/W）。结果清楚地表明，螺环阻挡是开发能够用于非掺杂OLED的深蓝色TADF发射体的一种有前景的策略。
