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Stable Orthorhombic CsPbBr3 Light Emitters: Encapsulation-Assisted In Situ Synthesis
Cited 2 time in
Web of Science
Cited 2 time in Scopus
- Authors
- Issue Date
- 2023-08
- Publisher
- American Chemical Society
- Citation
- Chemistry of Materials, Vol.35 No.16, pp.6266-6273
- Abstract
- Metal halide perovskite nanocrystals (PeNCs) are promisingcandidatesfor achieving Rec. 2020 with high color purity. However, the stabilityof PeNCs is inferior to that of conventional inorganic quantum dotemitters. Here, we developed a simple method using perhydropolysilazane(PSZ) to synthesize chemically stable CsPbBr3 PeNCs whilesimultaneously encapsulating them in a SiO2 matrix. Duringthe synthesis, PSZ converts to SiO2, encapsulates PeNCs,and forms stable Pb-O bonds with the orthorhombic CsPbBr3 crystal. Unlike cubic CsPbBr3 PeNCs synthesizedby conventional colloidal synthesis, this encapsulation-assisted insitu synthesis provided orthorhombic CsPbBr3 crystals withgood control over the crystallization and with an average crystalsize of 34.7 nm. Surprisingly, the resulting PeNC-PSZ compositesshowed a high photoluminescence quantum yield (PLQY) of 84.7% evenwithout the use of organic ligands surrounding the PeNCs. The orthorhombicCsPbBr(3) PeNCs in situ-synthesized using PSZ assistanceshowed higher chemical stability than cubic CsPbBr3 PeNCssynthesized by the conventional hot-injection method during storageunder ambient conditions and in water and under continuous externalenergy (100 & DEG;C hot plate, UV excitation). Contrary to the commonbelief regarding the low stability of ionic perovskites in water,orthorhombic CsPbBr3 PeNC in situ-synthesized using PSZassistance retained >60% of the initial PL intensity even afterlongstorage in water for >1100 h, which is more than 600 times longerthan those of emitters that use PeNCs synthesized using the conventionalhot-injection method.
- ISSN
- 0897-4756
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