清华大学段炼团队开发了用于窄带OLEDs的具有宽范围颜色可调性的均三甲基官能化多共振有机硼延迟荧光框架。相关研究成果于2022年6月26日发表在《德国应用化学》。
环异质硼多共振(MR)发射体在高色纯有机电致发光二极管（OLED）中具有广阔的应用前景。
该文中，与最常见的杂原子三元掺杂（X/B/N）框架不同，报道了一种二元掺杂（B/N）框架，其具有大的能带以实现宽范围的颜色可调性。基于这一母段，开发了一种“一锅”无催化剂硼酰化方法，该方法可从现成的起始材料生成深蓝至纯绿色MR发射器，峰值在426-532 nm，半高宽为27-38 nm。令人印象深刻的是，在国际照明委员会坐标为（0.14，0.16）的相应设备中，记录到近40%的最大外部量子效率，代表了最先进的性能。
该项工作为硼氮掺杂磁共振发射体的合成提供了一个新的范例，并将推动其他新型框架的研究。
附：英文原文
Title: Mesityl-Functionalized Multi-Resonance Organoboron Delayed Fluorescent Frameworks with Wide-range Color Tunability for Narrowband OLEDs
Author: 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
Issue&Volume: 2022-06-26
Abstract: Polycyclo-heteraborin multi-resonance (MR) emitters are promising for high color-purity organic light-emitting diodes (OLEDs). Here, unlike the most common heteroatoms ternary-doped (X/B/N) frameworks, a binary-doped (B/N) skeleton is reported with large energy band for wide-range color tunability. Based on this parent-segment, an “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.
DOI: 10.1002/anie.202206916
Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202206916
