6533b825fe1ef96bd128321b
RESEARCH PRODUCT
CsPbX3/SiOx (X = Cl, Br, I) monoliths prepared via a novel sol-gel route starting from Cs4PbX6 nanocrystals
Zhiya DangLuca De TrizioFrancisco PalazonMai Ngoc AnMai Ngoc AnRoman KrahneGuilherme AlmeidaDavide SpiritoDavide SpiritoLiberato MannaSung Wook ParkSung Wook Parksubject
Materials scienceNanocompositeNanotecnologiaPhosphor02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesTetraethyl orthosilicatechemistry.chemical_compoundColloidchemistryChemical engineeringNanocrystalSemiconductorsNitric acidThermal stabilityGeneral Materials Science0210 nano-technologySol-geldescription
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).
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-01-01 |