High-Performance Dibenzoheteraborin-Based Thermally Activated Delayed Fluorescence Emitters: Molecular Architectonics for Concurrently Achieving Narrowband Emission and Efficient Triplet-Singlet Spin Conversion
作者:In Seob Park、Kyohei Matsuo、Naoya Aizawa、Takuma Yasuda
DOI:10.1002/adfm.201802031
日期:2018.8
strategy of TADF emitters is established to fulfill these requirements. Here, an epoch‐making design strategy is proposed for producing high‐performance TADF emitters that concurrently exhibiting high ΦPL values close to 100%, narrow emission bandwidths, and short emission lifetimes of ≈1 µs, with a fast reverse intersystem crossing rate of over 106 s−1. A new family of TADF emitters based on dibenzoheteraborins
作为有机发光二极管(OLED)的第三代发射器,有望取代传统的荧光和磷光材料的热激活延迟荧光(TADF)材料能够完全收集单重态和三重态激发态用于发光。高光致发光量子产率(Φ PL),窄带发射(或高色纯度),和短延迟荧光寿命都强烈期望在实际应用中。但是,迄今为止,还没有建立合理的TADF发射器设计策略来满足这些要求。在这里,一个划时代的设计策略提出了一种用于生产高性能TADF发射器并发地呈现高Φ PL值接近100%,发射带宽窄,发射寿命短约≈1 µs,系统间反向反向快速穿越速率超过10 6 s -1。引入了一个新的基于二苯并杂硼酸酯的TADF发射体系列,它使掺杂和未掺杂的TADF-OLED都能实现显着高的外部电致发光量子效率,超过20%,并且在实用的高亮度下效率可以忽略不计。本文报道了这些基于二苯并杂丁香的TADF发射器的系统光物理和理论研究以及器件评估。