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Integrating the Emitter and Host Characteristics of Donor–Acceptor Systems through Edge‐Spiro Effect Toward 100% Exciton Harvesting in Blue and White Fluorescence Diodes
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-04-10 , DOI: 10.1002/adom.201800165
Xialei Lv 1 , Wenzhi Zhang 1 , Dongxue Ding 2 , Chunmiao Han 2 , Zhi Huang 1 , Songpo Xiang 1 , Qing Zhang 1 , Hui Xu 2 , Lei Wang 1
Affiliation  

Herein, by utilizing edge‐spiro effect to modulate intramolecular charge transfer and intermolecular interactions, emitter and host characteristic are integrated in simple donor–acceptor systems named SFInxTz. As emitter, SFI34pTz realizes true‐blue thermally activated delayed fluorescent (TADF) diodes with an external quantum efficiency (EQE) of 25.3% and Commission Internationale de L'Eclairage (CIE) coordinates of (0.15, 0.20). As host, it can endow the yellow devices with the maximum EQE about 18%. When SFI34pTz serves as both blue emitter and yellow host material in pure fluorescence white device, the maximum efficiencies are as high as 22.9% for EQE and 52.4 lm W−1 for power efficiency, and stable electroluminescence spectra are successfully realized with CIE coordinates of (0.32 ± 0.01, 0.42 ± 0.02). Above all, SFI34pTz manifests the effectiveness of the edge‐spiro strategy in developing host‐featured blue TADF dyes for high‐performance blue devices and white organic light‐emitting diodes (WOLEDs). More importantly, a novel blue–orange–blue sandwich device structure consisting of all‐TADF materials for high‐efficiency pure fluorescence WOLEDs is proposed.

中文翻译:

通过边缘螺旋效应将施主-受主系统的发射体和宿主特征集成在一起,以实现蓝色和白色荧光二极管中100%激子的收集

在这里,通过利用边缘螺线效应来调节分子内电荷转移和分子间的相互作用,将发射体和宿主的特征整合到名为SFI nx Tz的简单供体-受体系统中。作为发射器,SFI34pTz实现了真蓝热激活延迟荧光(TADF)二极管,其外部量子效率(EQE)为25.3%,国际照明委员会(CIE)坐标为(0.15,0.20)。作为主机,它可以使黄色设备的最大EQE约为18%。当SFI34pTz在纯荧光白色器件中同时用作蓝色发射体和黄色主体材料时,EQE和52.4 lm W -1的最大效率高达22.9%为了提高功率效率,成功地实现了CIE坐标为(0.32±0.01,0.42±0.02)的稳定电致发光光谱。最重要的是,SFI34pTz在开发用于高性能蓝色设备和白色有机发光二极管(WOLED)的具有主体功能的蓝色TADF染料方面证明了边缘螺旋策略的有效性。更重要的是,提出了一种新颖的蓝橙色蓝夹层器件结构,该结构由全TADF材料组成,用于高效纯荧光WOLED。
更新日期:2018-04-10
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