CsPbX3/SiOx (X = Cl, Br, I) monoliths prepared via a novel sol–gel route starting from Cs4PbX6 nanocrystals. Issue 40 (8th October 2019)

• Record Type: Journal Article
• Authors: Park, Sungwook; An, Mai Ngoc; Almeida, Guilherme; Palazon, Francisco; Spirito, Davide; Krahne, Roman; Dang, Zhiya; De Trizio, Luca; Manna, Liberato
• Is Part Of: Nanoscale. Volume 11:Issue 40(2019)
• Page Start: 18739
• Page End: 18745
• Publication Date: 2019-10-08
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr07766a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : We developed a facile synthesis of nanocomposite powders of CsPbX3 nanocrystals (NCs) embedded in silica. Abstract : We developed a facile synthesis of nanocomposite powders of CsPbX3 nanocrystals (NCs) embedded in silica. The synthesis starts from colloidal Cs4 PbX6 NCs that are mixed with tetraethyl orthosilicate in the presence of nitric acid, which triggers the sol–gel reaction yielding the formation of SiO x and the conversion of starting NCs into CsPbX3 ones. The overall reaction delivers CsPbX3 NCs encased in a silica matrix. The resulting CsPbX3 /SiO x nano-composite powders exhibited enhanced moisture and thermal stability in air. Also, when mixing different CsPbX3 /SiO x samples having diverse anion compositions, no interparticle anion exchange processes were observed, which is a further indication that the silica matrix acts as a robust barrier surrounding the NCs. Finallly, we used these composites as down-converter phosphors on top of a blue light-emitting diode (LED), delivering nearly ideal white light emission with the Commission Internationale de l'Eclairage (CIE) color coordinates (0.32, 0.33).