Water-driven CsPbBr3 nanocrystals and poly(methyl methacrylate)-CsPbBr3 nanocrystal films with bending-endurable photoluminescence
| Autor: | Nadeesha Lakmali Kothalawala, Dali Qian, Yulin Zhang, Xiaobing Tang, Doo Young Kim, Fuqian Yang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Liquid-crystal display Photoluminescence General Chemical Engineering Bilayer General Chemistry Poly(methyl methacrylate) Industrial and Manufacturing Engineering law.invention chemistry.chemical_compound chemistry Chemical engineering Nanocrystal law Flexible display visual_art visual_art.visual_art_medium Environmental Chemistry Methyl methacrylate Perovskite (structure) |
| Zdroj: | Chemical Engineering Journal. 425:131456 |
| ISSN: | 1385-8947 |
| Popis: | Perovskite nanocrystals are regarded as next-generation functional materials for display applications, especially for flexible liquid crystal displays (LCDs). As a potential component of flexible LCD backlights, perovskite nanocrystal films are facing a challenge issue of deformation-induced shift of photoluminescence, leading to an image distortion. To date, most synthesis methods have involved the use of organic solvent in precursor solutions, such as N,N-dimethylformamide and dimethyl sulfoxide, which poses a potential threat to the environment, health and security. In this work, we demonstrate the feasibility to produce microsized CsPbBr3 crystals with deionized water as the precursor solvent via an environmental-friendly and cost-efficient approach and CsPbBr3 nanocrystals with green (~522 nm) and blue (~493 nm) emissions from the microsized CsPbBr3 crystals in toluene under sonication. The blue-emitting nanocrystals exhibit a photoluminescence (PL) quantum yield of 80%, much larger than 61.4% of the CsPbBr3 nanocrystals made by an anti-solvent method; the green-emitting nanocrystals exhibit better stability than those made by the antisolvent method over 9 days. Using the green-emitting CsPbBr3 nanocrystals, we prepare a bilayer structure with a poly(methyl methacrylate)-CsPbBr3 nanocrystal film on a polyethylene terephthalate plate. The films exhibit bending-endurable photoluminescence, i.e. the wavelength of the PL peak remains unchanged, for local radius of curvature of the bilayer up to 10.07 mm under bending. This study opens a new avenue to potentially produce microsized perovskite crystals without harmful organic solvents and bending-endurable backlight films for the applications in flexible display. |
| Databáze: | OpenAIRE |
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