CsPbX3/SiOx (X = Cl, Br, I) monoliths prepared via a novel sol-gel route starting from Cs4PbX6 nanocrystals
| Autor: | Zhiya Dang, Luca De Trizio, Francisco Palazon, Mai Ngoc An, Roman Krahne, Guilherme Almeida, Davide Spirito, Liberato Manna, Sung Wook Park |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanocomposite Nanotecnologia Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Tetraethyl orthosilicate chemistry.chemical_compound Colloid chemistry Chemical engineering Nanocrystal Semiconductors Nitric acid Thermal stability General Materials Science 0210 nano-technology Sol-gel |
| Zdroj: | Park, Sungwook An, Mai Ngoc Almeida, Guilherme Palazón Huet, Francisco Spirito, Davide Krahne, Roman Dang, Zhiya De Trizio, Luca Manna, Liberato 2019 CsPbX3/SiOx (X = Cl, Br, I) monoliths prepared via a novel sol-gel route starting from Cs4PbX6 nanocrystals Nanoscale 11 18739 18745 RODERIC: Repositorio Institucional de la Universitat de Valéncia Universitat de València Nanoscale RODERIC. Repositorio Institucional de la Universitat de Valéncia instname |
| Popis: | We developed a facile synthesis of nanocomposite powders of CsPbX3 nanocrystals (NCs) embedded in silica. The synthesis starts from colloidal Cs4PbX6 NCs that are mixed with tetraethyl orthosilicate in the presence of nitric acid, which triggers the sol-gel reaction yielding the formation of SiOx and the conversion of starting NCs into CsPbX3 ones. The overall reaction delivers CsPbX3 NCs encased in a silica matrix. The resulting CsPbX3/SiOx nano-composite powders exhibited enhanced moisture and thermal stability in air. Also, when mixing different CsPbX3/SiOx 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). |
| Databáze: | OpenAIRE |
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