Sun Wei, Zhou Nonglin, Xiao Yin, Wang Shirong, Li Xianggao
Tianjin University, School of Chemical Engineering and Technology, Tianjin, 300072, China.
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China.
Chem Asian J. 2017 Dec 5;12(23):3069-3076. doi: 10.1002/asia.201701292. Epub 2017 Oct 30.
Typical π-π stacking and aggregation-caused quenching could be suppressed in the film-state by the spiro conformation molecular design in the field of organic light-emitting diodes (OLEDs). Herein, a novel deep-blue fluorescent material with spiro conformation, 1-(4-(tert-butyl)phenyl)-2-(4-(10-phenyl-10H-spiro[acridine-9,9'-fluoren]-2-yl)phenyl)-1H-phenanthro[9,10-d]imidazole (SAF-BPI), was designed and synthesized. The compound consists of spiro-acridine-fluorene (SAF) as donor part and phenanthroimidazole (BPI) as acceptor part. Owing to the rigid SAF skeleton, this compound exhibits a high thermal stability with a glass transition temperature (T ) of 198 °C. The compound exhibits bipolar transporting characteristics demonstrated by the single-carrier devices. The non-doped OLEDs based on the SAF-BPI as the emitting layer shows maximum emission at 448 nm, maximum luminance of 2122 cd m , maximum current efficiency (CE) of 3.97 cd A , and a maximum power efficiency of 2.08 lm W . The chromaticity coordinate is stable at (0.15, 0.10) at the voltage of 7-11 V. The device shows a slow efficiency roll-off with CE of 3.35 and 2.85 cd A at 100 and 1000 cd m , respectively.
在有机发光二极管（OLED）领域，通过螺环构象分子设计，可在薄膜状态下抑制典型的π-π堆积和聚集诱导猝灭。在此，设计并合成了一种具有螺环构象的新型深蓝色荧光材料1-(4-(叔丁基)苯基)-2-(4-(10-苯基-10H-螺[吖啶-9,9'-芴]-2-基)苯基)-1H-菲并[9,10-d]咪唑（SAF-BPI）。该化合物由螺环吖啶-芴（SAF）作为供体部分和菲并咪唑（BPI）作为受体部分组成。由于刚性的SAF骨架结构，该化合物具有较高的热稳定性，玻璃化转变温度（Tg）为198℃。单载流子器件表明该化合物具有双极传输特性。以SAF-BPI作为发光层的非掺杂OLED在448nm处有最大发射，最大亮度为2122cd m-2，最大电流效率（CE）为3.97cd A-1，最大功率效率为2.08lm W-1。在7-11V电压下，色度坐标稳定在（0.15,0.10）。该器件效率滚降缓慢，在100和1000cd m-2时CE分别为3.35和2.85cd A-1。
