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One Hundred‐Nanometer‐Sized CsPbBr 3 /m‐SiO 2 Composites Prepared via Molten‐Salts Synthesis are Optimal Green Phosphors for LCD Display Devices
Author(s) -
Liu Zheming,
Sinatra Lutfan,
Lutfullin Marat,
Ivanov Yurii P.,
Divitini Giorgio,
De Trizio Luca,
Manna Liberato
Publication year - 2022
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202201948
Subject(s) - materials science , phosphor , photoluminescence , optoelectronics , composite number , nanometre , glaze , liquid crystal display , quantum yield , nanotechnology , optics , composite material , fluorescence , ceramic , physics
The exploitation of the optimal optical properties of lead halide perovskite nanocrystals in optoelectronic devices is mainly hindered by the low stability of such materials. Here, a molten‐salts approach is developed to encapsulate CsPbBr 3 nanocrystals (together with KNO 3 , NaNO 3 , and KBr inorganic salts) inside different nanoscale mesoporous SiO 2 host matrices, having sizes between 100 and 300 nm. The comparison between optical properties and stability of the products, including the previously reported ≥600‐nm‐sized CsPbBr 3 /m‐SiO 2 composite, indicates that 100‐nm‐sized CsPbBr 3 /m‐SiO 2 particles feature the best stability against humidity, light irradiation and heat, and exhibit a green (peaked at 517 nm) narrow photoluminescence (full width at half maximum of 18 nm) with high quantum yield (77%). Such properties make these composite particles optimal green phosphors for down conversion liquid crystal displays (LCDs). Indeed, the authors demonstrate that a proof‐of‐concept 7‐in. LCD in which the green color conversion layer is a polymer film loaded with 100‐nm‐sized CsPbBr 3 /m‐SiO 2 particles, features an optimal white emission (with correlated color temperature of 6861 K), that is close to the reference white point of NTSC, and covers 92% of NTSC standard color gamut area of CIE1931, higher than that of a reference commercial LCD (Dell XPS 15 7590 laptop).