Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 12, Pages 14303-14311Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c03937
Keywords
organic-inorganic hybrid perovskite; luminescent film; in situ crystallization; calcium halide; tunable emitting
Funding
- National Natural Science Foundation of China [21871008, 51872315]
- Key Research Program of Frontier Science, Chinese Academy of Sciences [QYZDJ-SSW-JSC013]
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Confining organometal halide perovskite nanocrystals in an inorganic matrix can enhance the photoluminescence quantum yield and achieve pure blue emission, improving the performance of organic-inorganic hybrid perovskite electroluminescence devices.
Organometal halide perovskite nanocrystals show near-unity photoluminescence quantum yield which decrease dramatically in thin films because of nonradiative losses. Here, we demonstrate a solution-processed highly luminescent perovskite film by confining the MAPbBr(3) nanocrystals into the inorganic CaBr2 matrix in situ. The confinement of the exciton in small nanograins facilitates radiative recombination. Meanwhile, part of the lattice-incorporated calcium ions could alter the electronic band structures and then increase the exciton binding energy of MAPbBr(3) perovskite. The synergism of morphology control and structural regulation leads to efficient radiative recombination and the enhancement of photoluminescence quantum yield from 4.2% to 45.6%. Moreover, the chloride could also be introduced and stabilized into the perovskite lattice through the calcium incorporation. Desirable pure blue (<480 nm) emission was obtained in situ through manipulating the calcium and chloride ions in the precursor solutions without the assistance of bulky ligands. Our strategies of locally creating luminescent color-tunable perovskite films are promising for further improving the performance of organic-inorganic hybrid perovskite electroluminescence devices.
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