Encapsulating all-inorganic perovskite quantum dots into mesoporous metal organic frameworks with significantly enhanced stability for optoelectronic applications

By Jiejun Ren, Tian Li, Xiaopeng Zhou, Xuan Dong, A. V. Shorokhov, M. Semenov, V. Krevchik, Yuhua Wang. Chemical Engineering Journal, 2019

199 citations recorded by the source corpus.

Abstract CsPbX3 (X = Cl, Br, and I) perovskite quantum dots (PeQDs) possess outstanding optical properties. However, the poor stability hinders the application of CsPbX3 PeQDs. Here we report a new strategy to enhance the stability of the PeQDs by embedding CsPbX3 PeQDs into the mesostructure zinc-based metal organic framework (MOF-5) crystals. First, the pore structure of MOF-5 crystals is expanded to mesopores by using templating agents cetyltrimethylammonium bromide and 1,3,5-trimethylbenzene. And then, the CsPbX3/MOF-5 composites are obtained by the physical mixing of CsPbX3 PeQDs with the mesoporous MOF-5 crystals in solution. The mesoporous structured MOF-5 crystals worked as an excellent dispersion medium to endow CsPbX3 PeQDs with improved stability (thermal-stability, photo-stability and long-term stability) and the property against anion exchange. Using CsPbX3/MOF-5 composites, a warm white LED is obtained with the color temperature of 3607 K and a wide color gamut (124% of National Television Standards Committee). This study proposes a new strategy to improve the stability of PeQDs, which eliminates the obstacles to the applications of PeQDs.

Subfields: Electrical and Electronic Engineering, Inorganic Chemistry, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/639d34727001a75176d891cff085a34d6a60c434