Synergetic Insulation and Induction Effects Selectively Optimize Multiresonance Thermally Activated Delayed Fluorescence.

IF 10.7

Research (Washington, D.C.) Pub Date : 2022-06-02 eCollection Date: 2022-01-01 DOI:10.34133/2022/9838120

Jinkun Bian, Su Chen, Lili Qiu, Nan Zhang, Jing Zhang, Chunbo Duan, Chunmiao Han, Hui Xu

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引用次数: 2

Abstract

Multiresonance (MR) emitters featuring narrowband emissions and theoretically 100% exciton harvesting are great potential for organic light-emitting diode (OLED) applications. However, how to functionalize MR molecules without scarifying emission color purity is still a key challenge. Herein, we report a feasible strategy for selective optimization of MR molecules, which is demonstrated by a blue MR emitter tCBNDASPO substituted with a diphenylphosphine oxide (DPPO) group. Compared to its DPPO-free parent molecule, tCBNDASPO preserves narrowband feature with full widths at half maximum (FWHM) values of 28 nm in film and 32 nm in OLEDs and achieves 40% increased photoluminescence (92%) and electroluminescence quantum efficiencies (28%). It is showed that insulation effect of P=O effectively confines the singlet excited state on MR core to keep emission color purity, and its induction effect enhances singlet radiation and triplet-to-singlet conversion. This synergism for selective optimization is based on rational linkage between MR core and functional groups.

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协同绝缘和感应效应选择性优化多共振热激活延迟荧光。

多共振(MR)发射器具有窄带发射和理论上100%激子捕获的特点，在有机发光二极管(OLED)应用中具有很大的潜力。然而，如何在不影响发射色纯度的情况下功能化MR分子仍然是一个关键的挑战。在此，我们报告了一种可行的MR分子选择性优化策略，该策略通过用二苯基氧化膦(DPPO)基取代蓝色MR发射器tCBNDASPO来证明。与不含dppo的母体分子相比，tCBNDASPO保留了薄膜中28 nm和oled中32 nm的全宽半最大值(FWHM)的窄带特征，光致发光(92%)和电致发光量子效率(28%)分别提高了40%和40%。结果表明，P=O的绝缘效应有效地限制了磁铁芯上的单线态激发态以保持发射色纯度，其感应效应增强了单线态辐射和三重态到单线态的转换。这种选择性优化的协同作用是基于MR核心和官能团之间的合理联系。

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Research (Washington, D.C.)

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