Mesityl‐Functionalized Multi‐Resonance Organoboron Delayed Fluorescent Frameworks with Wide‐Range Color Tunability for Narrowband OLEDs. Issue 38 (10th August 2022)

• Record Type: Journal Article
• Authors: Wang, Xiang; Zhang, Yuewei; Dai, Hengyi; Li, Guomeng; Liu, Meihui; Meng, Guoyun; Zeng, Xuan; Huang, Tianyu; Wang, Lu; Peng, Qian; Yang, Dezhi; Ma, Dongge; Zhang, Dongdong; Duan, Lian
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 38(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-10
• Subjects: Deep Blue Color -- Multiresonance Emitters -- Organic Light-Emitting Diodes -- Organoboron Emitters -- Thermally Activated Delayed Fluorescence; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202206916
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Polycyclo‐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. Abstract : Deep blue to pure green boron‐ and nitrogen‐embedded multi‐resonance (MR) emitters with a binary‐doped B/N skeleton have been developed that exhibit high photoluminescence quantum yields up to unity, narrow band widths (FWHM <40 nm), and fast radiative decay rates of about 10 8 s −1 . The materials show maximum external quantum efficiencies up to 39.8 % and CIEy coordinates of 0.05 when used as emitters in organic light‐emitting diodes.