Ceramic-like stable CsPbBr<sub>3</sub> nanocrystals encapsulated in silica derived from molecular sieve templates.
basic_science · Level V
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- Record sourced from PubMed, PMID 31911597.
- Also identified by DOI 10.1038/s41467-019-13881-0 and PMC identifier 6946649.
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Abstract
Achieving good stability while maintaining excellent properties is one of the main challenges for enhancing the competitiveness of luminescent perovskite CsPbX<sub>3</sub> (X=Cl, Br, I) nanocrystals (NCs). Here, we propose a facile strategy to synthesize ceramic-like stable and highly luminescent CsPbBr<sub>3</sub> NCs by encapsulating them into silica derived from molecular sieve templates at high temperature (600-900 <sup>o</sup>C). The obtained CsPbBr<sub>3</sub>-SiO<sub>2</sub> powders not only show high photoluminescence quantum yield (~71%), but also show an exceptional stability comparable to the ceramic Sr<sub>2</sub>SiO<sub>4</sub>:Eu<sup>2+</sup> green phosphor. They can maintain 100% of their photoluminescence value under illumination on blue light-emitting diodes (LEDs) chips (20 mA, 2.7 V) for 1000 h, and can also survive in a harsh hydrochloric acid aqueous solution (1 M) for 50 days. We believe that the above robust stabilities will significantly enhance the potential of perovskite CsPbX<sub>3</sub> NCs to be practically applied in LEDs and backlight displays.