Water-driven CsPbBr3 nanocrystals and poly(methyl methacrylate)-CsPbBr3 nanocrystal films with bending-endurable photoluminescence
Water-driven CsPbBr3 nanocrystals and poly(methyl methacrylate)-CsPbBr3 nanocrystal films with bending-endurable photoluminescence
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DOI：
10.1016/j.cej.2021.131456
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发表时间：
2021-12
影响因子：
15.1
通讯作者：
Xiaobing Tang;N. Kothalawala;Yulin Zhang;D. Qian;D. Kim;Fuqian Yang
中科院分区：
文献类型：
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作者：
Xiaobing Tang;N. Kothalawala;Yulin Zhang;D. Qian;D. Kim;Fuqian Yang
Percords纳米晶体被认为是下一代显示应用的功能材料，特别是用于柔性液晶显示器（LCD）。作为柔性LCD背光源的潜在组件，钙钛矿型OLED薄膜正面临着光致发光位移的挑战，导致图像失真。迄今为止，大多数合成方法涉及在前体溶液中使用有机溶剂，例如N，N-二甲基甲酰胺和二甲基亚砜，这对环境、健康和安全构成潜在威胁。在这项工作中，我们证明了以去离子水为前体溶剂通过环境友好和成本有效的方法制备微米级CsPbBr 3晶体的可行性，并在超声处理下从甲苯中的微米级CsPbBr 3晶体制备具有绿色（~522 nm）和蓝色（~493 nm）发射的CsPbBr 3纳米晶体。蓝色发光纳米晶体表现出80%的光致发光（PL）量子产率，远大于61.4%的CsPbBr 3纳米晶体由反溶剂法;绿色发光纳米晶体表现出更好的稳定性比那些由反溶剂法超过9天。使用绿色发光的CsPbBr 3纳米晶体，我们制备了一个双层结构的聚（甲基丙烯酸甲酯）-CsPbBr 3纳米薄膜上的聚对苯二甲酸乙二醇酯板。该薄膜表现出弯曲耐受的光致发光，即PL峰的波长保持不变，为局部曲率半径的双层弯曲下高达10.07毫米。这项研究开辟了一条新的途径，有可能生产微尺寸的钙钛矿晶体，没有有害的有机溶剂和弯曲耐用的背光薄膜的应用在柔性显示器。
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 CsPbBr3crystals with deionized water as the precursor solvent via an environmental-friendly and cost-efficient approach and CsPbBr3nanocrystals with green (~522 nm) and blue (~493 nm) emissions from the microsized CsPbBr3crystals in toluene under sonication. The blue-emitting nanocrystals exhibit a photoluminescence (PL) quantum yield of 80%, much larger than 61.4% of the CsPbBr3nanocrystals 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 CsPbBr3nanocrystals, we prepare a bilayer structure with a poly(methyl methacrylate)-CsPbBr3nanocrystal 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.