Graduate School at Shenzhen , Tsinghua University , Shenzhen 518055 , China.
School of Photovoltaic and Renewable Energy Engineering , University of New South Wales , Sydney 2052 , Australia.
ACS Appl Mater Interfaces. 2018 May 9;10(18):15888-15894. doi: 10.1021/acsami.8b02857. Epub 2018 Apr 30.
CsPbBr perovskite quantum dots (PQDs)/ethylene vinyl acetate (EVA) composite films were prepared via a one-step method; on the basis of this, both supersaturated recrystallization of CsPbBr PQDs and dissolution of EVA were realized in toluene. The prepared films display outstanding green-emitting performance with high color purity of 92% and photoluminescence (PL) quantum yield of 40.5% at appropriate CsPbBr PQD loading. They possess long-term stable luminescent properties in the air and in water, benefiting from the effective protection of CsPbBr PQDs by the EVA matrix. Besides, the prepared CsPbBr PQDs/EVA films are flexible enough to be repeatedly bent for 1000 cycles while keeping unchanged the PL intensity. The optical properties of the CsPbBr PQDs/EVA films in white light-emitting diodes were also studied by experiments and theoretical simulation. Overall, facile preparation process, good long-term stability, and high flexibility allow our green-emitting CsPbBr PQDs/EVA films to be applied in lighting applications and flexible displays.
钙钛矿量子点（CsPbBr PQDs）/乙烯-醋酸乙烯共聚物（EVA）复合膜通过一步法制备；在此基础上，在甲苯中实现了 CsPbBr PQDs 的过饱和再结晶和 EVA 的溶解。所制备的薄膜在适当的 CsPbBr PQD 负载下显示出出色的绿色发光性能，具有 92%的高光色纯度和 40.5%的光致发光（PL）量子产率。它们在空气中和水中具有长期稳定的发光性能，得益于 EVA 基质对 CsPbBr PQDs 的有效保护。此外，所制备的 CsPbBr PQDs/EVA 薄膜具有足够的柔韧性，可反复弯曲 1000 次，而 PL 强度保持不变。还通过实验和理论模拟研究了 CsPbBr PQDs/EVA 薄膜在白光发光二极管中的光学性能。总体而言，简便的制备工艺、良好的长期稳定性和高柔韧性使得我们的绿色发光 CsPbBr PQDs/EVA 薄膜能够应用于照明应用和柔性显示器。
