Highly Efficient and Stable Blue
<scp>OLEDs</scp>
Based on B—N Bonds Embedded 6,
<scp>12‐Diphenyl</scp>
‐5,11‐dihydroindolo[3,2‐
<i>b</i>
]carbazole with Narrowband Emission and Extended Lifetime
<sup>†</sup>
作者:Hengyi Dai、Jianping Zhou、Guoyun Meng、Lu Wang、Lian Duan、Dongdong Zhang
DOI:10.1002/cjoc.202200693
日期:2023.3.15
12-diphenyl-5,11-dihydroindolo[3,2-b]carbazole derivatives (tPh[BN] and Cz[BN]) containing two B—N covalent bonds are easily constructed through amine-directed double borylation strategy. Both emitters behaved bright blue emission with full-width-at-half-maximum (FWHM) of 20—27 nm in solution, high fluorescence quantum efficiency over 90%, and excellent stability toward moisture. By employing triplet-triplet
由于平板显示和固态照明领域对超高清显示器的需求不断增长,窄带光谱发射器在当今非常重要。尽管已报道的多共振 (MR) 发射器已被广泛研究,具有极其尖锐的光谱和颜色可调的发射,但亲电硼化合成策略和稳定的窄带蓝色器件仍然面临巨大挑战。在此,利用传统吲哚并咔唑骨架的MR效应和B—N共价键易接近的优点,线性叔丁基苯和咔唑基团修饰的6,12-二苯基-5,11-二氢吲哚[3,2- b]咔唑衍生物(tPh[BN] 和 Cz[BN])含有两个 B—N 共价键,很容易通过胺导向的双硼化策略构建。两种发射体均表现出明亮的蓝色发射,在溶液中半峰全宽 (FWHM) 为 20-27 nm,荧光量子效率超过 90%,并且对水分具有出色的稳定性。通过采用三重态-三重态湮灭电致发光机制,基于它们的蓝色 OLED 器件显示出 48 nm 的小 FWHM 和约 7.1% 的最大外量子效率,效率滚降可忽略不计,并且在 87 小时的长工作寿命