Wang Peijun, Wang Bolun, Liu Yucheng, Li Lin, Zhao Hua, Chen Yonghua, Li Jiyang, Liu Shengzhong Frank, Zhao Kui
Dalian National Laboratory for Clean Energy, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China.
Angew Chem Int Ed Engl. 2020 Dec 14;59(51):23100-23106. doi: 10.1002/anie.202011203. Epub 2020 Oct 15.
Metal halide perovskites have been widely applied in optoelectronic fields, but their poor stability hinders their actual applications. A perovskite-zeolite composite was synthesized via in situ growth in air from aluminophosphate AlPO-5 zeolite crystals and perovskite nanocrystals. The zeolite matrix provides quantum confinement for perovskite nanocrystals, achieving efficient green emission, and it passivates the defects of perovskite by H-bonding interaction, which leads to a longer lifetime compared to bulk perovskite film. Furthermore, the AlPO-5 zeolite also acts as a protection shield and enables ultrahigh stability of perovskite nanocrystals under 150 °C heat stress, under a 15-month long-term ambient exposure, and even in water for more than 2 weeks, respectively. The strategy of in situ passivation and encapsulation for the perovskite@AlPO-5 composite was amenable to a range of perovskites, from MA- to Cs-based perovskites. Benefiting from high stability and photoluminescence performance, the composite exhibits great potential to be virtually applied in light-emitting diodes (LEDs) and backlight displays.
金属卤化物钙钛矿已广泛应用于光电子领域，但其稳定性较差阻碍了它们的实际应用。通过在空气中由磷酸铝AlPO-5沸石晶体和钙钛矿纳米晶体原位生长合成了一种钙钛矿-沸石复合材料。沸石基质为钙钛矿纳米晶体提供量子限制，实现高效的绿色发射，并且通过氢键相互作用钝化钙钛矿的缺陷，与块状钙钛矿薄膜相比，这导致更长的寿命。此外，AlPO-5沸石还充当保护屏障，分别使钙钛矿纳米晶体在150°C热应力下、15个月的长期环境暴露下甚至在水中超过2周时具有超高稳定性。钙钛矿@AlPO-5复合材料的原位钝化和封装策略适用于一系列钙钛矿，从基于MA的到基于Cs的钙钛矿。受益于高稳定性和光致发光性能，该复合材料在发光二极管（LED）和背光显示器的实际应用中显示出巨大潜力。
