Air-stable high-PLQY cesium lead halide perovskites for laser-patterned displays,Journal of Materials Chemistry C

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Air-stable high-PLQY cesium lead halide perovskites for laser-patterned displays
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2023-01-09 , DOI: 10.1039/d2tc04445e
Ping Liu _{1,

2} , Boyang Yu ₃ , Wanqing Cai ₄ , Xiongxian Yao _{1,

2} , Kai Chang ₃ , Xinyan Zhao ₃ , Zhichun Si ₂ , Weiwei Deng ₃ , Yuanyuan Zhou _{5,

6} , Guangmin Zhou _{1,

2} , Guodan Wei _{1,

2}

Affiliation

Metal halide perovskites (MHPs) have emerged as attractive building blocks for advanced photoluminescence display applications. But the practical deployment of MHP displays is hindered by the relatively low air stability, which can cause difficulty in high-precision film patterning under ambient conditions while achieving high photoluminescence quantum yields (PLQYs). Here we incorporate a polymer additive of poly(2-ethyl-2-oxazoline) (PEtOx) in the solution processing of quasi-2D phenylbutylamine bromide/cesium lead halide (PBABr/CsPbBr_0.6I_2.4) perovskite films, which not only results in a high PLQY of 91%, but more importantly improves the ambient stability via Lewis base–acid interaction of oxygen functional groups of the polymer and Pb of the perovskite. Using time-resolved optical spectroscopy and femtosecond transient absorption spectroscopy, we find that in the PEtOx-stabilized quasi-2D perovskite film, the trap-assisted nonradiative recombination rate is reduced while the radiative recombination is significantly promoted, underpinning the PLQY improvements. Via mask-less laser direct-write patterning onto this air-stable high-PLQY perovskite film, we have achieved complex-patterned displays on both rigid and flexible substrates, with anti-counterfeiting encryption code as a proof-of-concept demonstration. This work opens new opportunities for engineering perovskites to multifunctional display applications.

中文翻译：

用于激光图案化显示器的空气稳定的高 PLQY 铯铅卤化物钙钛矿

金属卤化物钙钛矿 (MHP) 已成为先进光致发光显示应用的有吸引力的构建块。但是 MHP 显示器的实际应用受到相对较低的空气稳定性的阻碍，这可能导致在环境条件下难以进行高精度薄膜图案化，同时实现高光致发光量子产率 (PLQY)。在这里，我们在准二维苯基丁胺溴化物/铯铅卤化物 (PBABr/CsPbBr _0.6 I _2.4 ) 钙钛矿薄膜的溶液处理中加入聚（2-乙基-2-恶唑啉）（PEtO x ）的聚合物添加剂，这不仅导致在 91% 的高 PLQY 中，但更重要的是通过提高环境稳定性聚合物的氧官能团和钙钛矿的 Pb 的路易斯碱-酸相互作用。使用时间分辨光谱和飞秒瞬态吸收光谱，我们发现在 PEtO x稳定的准二维钙钛矿薄膜中，陷阱辅助非辐射复合率降低，同时辐射复合率显着提高，支持 PLQY 改进。通过在这种空气稳定的高 PLQY 钙钛矿薄膜上进行无掩模激光直写图案化，我们在刚性和柔性基板上实现了复杂图案显示，并使用防伪加密代码作为概念验证演示。这项工作为将钙钛矿工程化为多功能显示应用开辟了新的机会。

更新日期：2023-01-09

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