講演情報
[9p-C309-2]In-situ growth of titanium alkoxide network encapsulated perovskite
nanograin for robust light emission
〇(D)Liu Yunlong1,2, Yingbo Zhao1, Zhijun Ning1, Qing Shen2 (1.Shanghai Tech Univ., 2.The Univ. of Electro-Communications)
キーワード：
Perovskite、Light-emitting Diodes、Metal Organic Framework
Perovskite light-emitting diodes (PeLEDs) have achieved remarkable efficiencies; however, poor operational stability caused by environmental degradation and ion migration remains a major challenge. Metal–organic framework (MOF)-based materials offer new opportunities for constructing protection layers beyond conventional additives.A titanium alkoxide network (TAN), a titanium-based MOF-like coordination network, was employed as an in-situ encapsulation layer. During film formation, DG serves as a precursor for TAN formation, enabling selective growth around perovskite grains. AFM-IR mapping reveals that TAN is localized at grain boundaries and surrounds individual grains, providing the first direct evidence of a shell-like encapsulation structure formed by an in-situ grown coordination network in perovskite films.TAN encapsulation improves both optical properties and stability. The photoluminescence quantum yield increases from 33.45% to 88.13%, while the films exhibit enhanced humidity, thermal, and solvent stability. More importantly, the ion migration activation energy increases from 0.29 eV to 0.77 eV. The increased migration barrier reduces ion-induced degradation and accounts for the improved stability.These results establish a customizable MOF-based grain-level encapsulation strategy that simultaneously enhances luminescence and stability, providing a new route toward highly stable PeLEDs.