作者:Ping-I Shih、Chen-Han Chien、Chu-Ying Chuang、Ching-Fong Shu、Cheng-Han Yang、Jian-Hong Chen、Yun Chi
DOI:10.1039/b616043c
日期:——
We report the synthesis and characterization of a novel silane–fluorene hybrid, triphenyl-(4-(9-phenyl-9H-fluoren-9-yl)phenyl)silane (TPSi-F), used as the host material for blue phosphorescent devices. TPSi-F is constructed by linking p-substituted tetraphenylsilane to the fluorene framework through a non-conjugated, sp3-hybridized carbon atom (C-9) to enhance thermal and morphological stabilities, while maintaining the much needed higher singlet and triplet energy gap. Highly efficient sky-blue phosphorescent OLEDs were obtained when employing TPSi-F as the host and iridium(III) bis[(4,6-difluorophenyl)pyridinato-N,C2′] (FIrpic) as the guest. The maximum external quantum efficiency (max. E.Q.E.) of this device reached as high as 15% (30.6 cd A−1). Furthermore, upon switching the guest from FIrpic to a new blue phosphor FIrfpy, better blue-emitting OLEDs were produced with a max. E.Q.E. of 9.4% (15.1 cd A−1). These TPSi-F based blue phosphorescent devices show a 2-fold enhancement in device efficiency compared with reference devices based on the conventional host material 1,3-bis(9-carbazolyl)benzene (mCP).
我们报告了一种新型硅烷-芴杂化物--三苯基-(4-(9-苯基-9H-芴-9-基)苯基)硅烷(TPSi-F)的合成和表征,它可用作蓝色磷光器件的宿主材料。TPSi-F 是通过一个非共轭、sp3 杂化碳原子(C-9)将对取代的四苯基硅烷连接到芴框架上,从而增强了热稳定性和形态稳定性,同时保持了急需的较高单线能隙和三线能隙。采用 TPSi-F 作为宿主,双[(4,6-二氟苯基)吡啶-N,C2′]铱(III)(FIrpic)作为客体,获得了高效的天蓝色磷光 OLED。该装置的最大外部量子效率(max. E.Q.E.)高达 15%(30.6 cd A-1)。此外,将客体从 FIrpic 换成一种新的蓝色荧光粉 FIrfpy 后,生产出了更好的蓝色发光有机发光二极管,其最大 E. Q. E. 为 9.5 cd A-1。E.Q.E.为 9.4% (15.1 cd A-1)。与基于传统主材料 1,3-双(9-咔唑基)苯(mCP)的参考器件相比,这些基于 TPSi-F 的蓝色磷光器件的器件效率提高了 2 倍。