Mesityl‐Functionalized Multi‐Resonance Organoboron Delayed Fluorescent Frameworks with Wide‐Range Color Tunability for Narrowband OLEDs

• DOI: 10.1002/anie.202206916
• Publication Date: 2022-06-27T02:28:48Z
• Authors: Xiang Wang; Yuewei Zhang; Hengyi Dai; Guomeng Li; Meihui Liu; Guoyun Meng; Xuan Zeng; Tianyu Huang; Lu Wang; Qian Peng; Dezhi Yang; Dongge Ma; Dongdong Zhang; Lian Duan
• Keywords: 02 engineering and technology; 0210 nano-technology

AbstractPolycyclo‐heteraborin multi‐resonance (MR) emitters are promising for high color‐purity organic light‐emitting diodes (OLEDs). Here, unlike the most common heteroatom ternary‐doped (X/B/N) frameworks, a binary‐doped (B/N) skeleton is reported with a large energy band for wide‐range color tunability. Based on this parent‐segment, a “one‐pot” catalyst‐free borylation method is developed which generates deep blue to pure green MR emitters from readily available starting materials, with peaks at 426–532 nm and full‐width‐at‐half‐maxima of 27–38 nm. Impressively, a maximum external quantum efficiency of nearly 40 % is recorded for the corresponding device with Commission Internationale de l′Eclairage coordinates of (0.14, 0.16), representing the state‐of‐the‐art performances. This work presents a new paradigm and synthesis of B/N‐doped MR emitters and will motivate the study of other novel frameworks.