The pursuit of ideal narrowband yellow multiple resonance (MR) emitters is hampered by the mutual constraints of effective spectral redshift and maintaining a small full width at half maximum (FWHM) value. Here, a novel multiple fusion molecular design strategy is reported to break this trade-off. Compared with the selected narrowband parent core, the specific multiple MR effects in target molecules can simultaneously extend the π-conjugation length, increase the rigidity of the structure, and reduce the vibrational frequency. Proof-of-the-concept emitters BN-DICz and DBN-ICz show bright yellowish green to yellow emissions in dilute toluene solutions with peaks at 533–542 nm and extremely small FWHMs of ≤20 nm. Notably, BN-DICz-based electroluminescent device exhibits excellent efficiencies of 37.4%, 136.6 cd A⁻¹, and 119.2 lm W⁻¹ with an FWHM of merely 23 nm, representing the best performance for yellow MR organic light-emitting diodes.

中文翻译：

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高性能黄色 OLED 的多重融合策略，半峰全宽低至 23 nm，外量子效率高达 37.4%

有效光谱红移和保持较小的半峰全宽 (FWHM) 值的相互制约阻碍了对理想窄带黄色多共振 (MR) 发射器的追求。在这里，据报道一种新颖的多重融合分子设计策略可以打破这种权衡。与选定的窄带母核相比，目标分子中特定的多重磁共振效应可以同时延长π共轭长度，增加结构刚性，降低振动频​​率。概念验证发射体 BN-DICz 和 DBN-ICz 在稀释的甲苯溶液中显示出明亮的黄绿色到黄色发射，峰值在 533-542 nm 和极小的 FWHMs ≤ 20 nm。^{值得注意的是，基于 BN-DICz 的电致发光器件表现出 37.4%、136.6 cd A -1}的出色效率, 和 119.2 lm W ^-1，FWHM 仅为 23 nm，代表黄色 MR 有机发光二极管的最佳性能。