AI 中文总结
研究探讨平面微腔对有机半导体发射的影响，通过嵌入ZnPc:TPBi混合物，抑制非辐射激基复合物形成等，提高光致发光量子产率超四十倍，揭示腔可调控激发态，为有机光电器件发展开辟新途径。
AI 中文摘要
光学微腔被广泛用于控制有机半导体的发射，但它们重塑发射前分子路径的能力在很大程度上仍未被探索。本文表明，将ZnPc:TPBi混合物嵌入平面法布里-珀罗微腔中，可以抑制非辐射激基复合物的形成，并消除高激发密度下的双分子湮灭，在连续波激发下，光致发光量子产率提高了四十多倍。这种增强远大于弱珀塞尔效应的预期。瞬态光谱、功率依赖光致发光和动力学建模表明，腔诱导的激发态布居重新平衡：从ZnPc单体到发射聚集体的长程福斯特能量转移增强，使其能够胜过向暗激基复合物的电荷转移。电磁计算预测，在相关距离处，FRET增强可达约400倍，与观察到的激基复合物介导的损失抑制一致。我们的结果表明，光学腔不仅可以控制分子的发射方式，还可以控制它们形成的激发态，为提高有机光电器件和光子器件的效率和降低滚降开辟了一条途径。
英文摘要
Optical microcavities are widely used to control the emission of organic semiconductors, but their ability to reshape the molecular pathways that precede emission remains largely unexplored. Here we show that embedding a ZnPc:TPBi blend in a planar Fabry-Pérot microcavity suppresses the formation of non-radiative exciplexes and removes bimolecular annihilation at high excitation densities, increasing the photoluminescence quantum yield by more than forty-fold under continuous-wave excitation. This enhancement is far larger than expected from the weak Purcell effect. Instead, transient spectroscopy, power-dependent photoluminescence and kinetic modelling point to a cavity-induced rebalancing of excited-state populations: long-range Förster energy transfer from ZnPc monomers to emissive aggregates is enhanced, allowing it to outcompete charge transfer to dark exciplexes. Electromagnetic calculations predict FRET enhancements of up to ~400-fold at relevant distances, consistent with the observed suppression of exciplex-mediated losses. Our results show that optical cavities can control not only how molecules emit, but also which excited states they form, opening a route to improved efficiency and reduced roll-off in organic optoelectronic and photonic devices.
Comments23 pages, 4 figures
