Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
We have developed an easy synthesis protocol of nanocomposite powder of CsPbX3 nanocrystals (NCs) embedded in silica. Synthesis of CsPbX3/SiOx starts from colloidal Cs4PbX6 NC mixed with tetraethyl orthosilicate in the presence of nitric acid, which leads to a sol-gel reaction, which leads to the formation of SiOx and the conversion of the starting Cs4PbX6 to CsPbX3. The overall reaction gives CsPbX3 NC surrounded by a silica matrix. The resulting CsPbX3 / SiOx nano-composite powders show improved moisture and thermal stability. In addition, when mixing of CsPbX3 / SiOx samples with various anion compositions, no anion exchange process between particles was observed, which is further evidence that the silica shell acts as a barrier surrounding the NC. Finally, this composite was used as a down converter phosphor on a blue light emitting diode (LED) to emit nearly ideal white light with the Commission Internationale de l'Eclairage (CIE) color coordinates (0.32, 0.33).
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