Dynamic bond interactions fine-tune the properties of multiple resonance emitters towards highly efficient narrowband green OLEDs,Chemical Science

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Dynamic bond interactions fine-tune the properties of multiple resonance emitters towards highly efficient narrowband green OLEDs
Chemical Science ( IF 7.6 ) Pub Date : 2023-02-28 , DOI: 10.1039/d3sc00246b
Yang Zou ₁ , Mingxin Yu ₁ , Jingsheng Miao ₁ , Taian Huang ₁ , Shuokun Liao ₁ , Xiaosong Cao ₁ , Chuluo Yang ₁

Affiliation

Multiple resonance (MR) molecules based on a B/N polycyclic aromatic framework are the cutting-edge materials in the field of organic light-emitting diodes (OLEDs) owing to their superb photophysical properties. Tailoring the MR molecular framework with various functional groups toward ideal properties has become an emerging topic in the field of materials chemistry. Dynamic bond interactions are versatile and powerful tools in regulating the properties of materials. Herein, the pyridine moiety, which presents high affinity to form dynamic bond interactions such as hydrogen bonds and N→B dative bonds, was introduced into the MR framework for the first time, and the designed emitters are synthesized in a feasible way. The introduction of the pyridine moiety not only maintained the conventional MR properties of the emitters, but also endowed the emitters with tunable emission spectra, narrowed emission, enhanced photoluminescence quantum yield (PLQY), and intriguing supramolecular assembly in the solid state. Thanks to the overall superior properties brought by the hydrogen-bond promoted molecular rigidity, green OLEDs based on the emitter exhibit excellent device performance with external quantum efficiency (EQE) up to 38% and a small FWHM of 26 nm, together with good roll-off performance.

中文翻译：

动态键相互作用微调多个共振发射器的特性以实现高效窄带绿色 OLED

基于 B/N 多环芳烃骨架的多共振 (MR) 分子由于其卓越的光物理特性而成为有机发光二极管 (OLED) 领域的前沿材料。定制具有各种官能团的 MR 分子框架以实现理想的性能已成为材料化学领域的一个新兴课题。动态键相互作用是调节材料性能的通用且强大的工具。在此，首次将具有高亲和力以形成氢键和N→B配位键等动态键相互作用的吡啶部分引入MR框架中，并以可行的方式合成了设计的发射体。吡啶部分的引入不仅保持了发射体的常规 MR 特性，而且还赋予了发射器可调谐发射光谱、窄发射、增强的光致发光量子产率 (PLQY) 以及有趣的固态超分子组装。由于氢键促进分子刚性带来的整体优越性能，基于发射极的绿色 OLED 表现出优异的器件性能，外部量子效率 (EQE) 高达 38%，FWHM 小至 26 nm，同时具有良好的滚动性能。关闭性能。

更新日期：2023-02-28

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