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Ceramic-like stable CsPbBr₃ nanocrystals encapsulated in silica derived from molecular sieve templates.

ABSTRACT: Achieving good stability while maintaining excellent properties is one of the main challenges for enhancing the competitiveness of luminescent perovskite CsPbX₃ (X=Cl, Br, I) nanocrystals (NCs). Here, we propose a facile strategy to synthesize ceramic-like stable and highly luminescent CsPbBr₃ NCs by encapsulating them into silica derived from molecular sieve templates at high temperature (600-900 ^oC). The obtained CsPbBr₃-SiO₂ powders not only show high photoluminescence quantum yield (~71%), but also show an exceptional stability comparable to the ceramic Sr₂SiO₄:Eu²⁺ 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 CsPbX₃ NCs to be practically applied in LEDs and backlight displays.

SUBMITTER: Zhang Q

PROVIDER: S-EPMC6946649 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Ceramic-like stable CsPbBr3 nanocrystals encapsulated in silica derived from molecular sieve templates.

Zhang Qinggang Q Wang Bo B Zheng Weilin W Kong Long L Wan Qun Q Zhang Congyang C Li Zhichun Z Cao Xueyan X Liu Mingming M Li Liang L

Nature communications 20200107 1

Achieving good stability while maintaining excellent properties is one of the main challenges for enhancing the competitiveness of luminescent perovskite CsPbX3 (X=Cl, Br, I) nanocrystals (NCs). Here, we propose a facile strategy to synthesize ceramic-like stable and highly luminescent CsPbBr3 NCs by encapsulating them into silica derived from molecular sieve templates at high temperature (600-900 oC). The obtained CsPbBr3-SiO2 powders not o ...[more]

PMID: 31911597

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Project description:Recently, CsPbX3 (X= Cl, Br, I) nanocrystals (NCs) have evolved as a potential contender for various optoelectronic applications due to some of their excellent photophysical properties. Their superior non-linear optical properties enable them to take part in bioimaging applications due to their longer penetration depth and less scattering effect in living cells. However, the poor stability of perovskite NCs in aqueous media still remains a great challenge for practical usage. Comparatively stable silica-coated NCs have a tendency to agglomerate among other NCs and transform into bigger particles. Such big particles clog the inside of narrow channels during the uptake and can't effectively reach the targeted cells. To tackle such issues, we introduce a fast and reproducible synthesis process of CsPbBr3 NCs that are coated with different long-chained organic ligands/polymers and compared their photophysical properties. Among them, polyvinylpyrrolidone (PVP) encapsulated NCs are highly luminescent in the green spectral region and showed a maximum photoluminescence quantum yield (PLQY) of up to 84%. The incorporation of n-isopropyl acrylamide (NIPAM) along with PVP further improves the stability of the PVP-coated NCs against heat and moisture. These NCs exhibit higher water stability compared to silica-coated NCs and maintained their emission properties for about one week in DI water. The smaller particle size, uniform size distribution, higher structural stability, and better dispersivity of polymer-coated NCs in the aqueous media enable them to perform as fluorescent probes for live cell imaging in mammalian Chinese Hamster Ovary (CHO-K1) cells. There is no adverse affect in the cells' viability and morphology even after long incubation periods (∼72 hours). The dosage of Pb-ions contained in the polymer-coated NCs is calculated as below 5 μg mL-1, which is suitable for live cell imaging. This work provides insight for expanding the use of these NCs significantly into bioimaging applications with higher sensitivity.

Dataset Information

Ceramic-like stable CsPbBr₃ nanocrystals encapsulated in silica derived from molecular sieve templates.

Publications

Ceramic-like stable CsPbBr<sub>3</sub> nanocrystals encapsulated in silica derived from molecular sieve templates.

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