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Core/Shell Perovskite Nanocrystals: Synthesis of Highly Efficient and Environmentally Stable FAPbBr3/CsPbBr3 for LED Applications
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-06-02 , DOI: 10.1002/adfm.201910582 Chengxi Zhang 1 , Sheng Wang 1 , Xiaomin Li 1 , Mingjian Yuan 2 , Lyudmila Turyanska 3 , Xuyong Yang 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-06-02 , DOI: 10.1002/adfm.201910582 Chengxi Zhang 1 , Sheng Wang 1 , Xiaomin Li 1 , Mingjian Yuan 2 , Lyudmila Turyanska 3 , Xuyong Yang 1
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Lead halide perovskite nanocrystals (PeNCs) are promising materials for applications in optoelectronics. However, their environmental instability remains to be addressed to enable their advancement into industry. Here the development of a novel synthesis method is reported for monodispersed PeNCs coated with all inorganic shell of cesium lead bromide (CsPbBr3) grown epitaxially on the surface of formamidinium lead bromide (FAPbBr3) NCs. The formed FAPbBr3/CsPbBr3 NCs have photoluminescence in the visible range 460–560 nm with narrow emission linewidth (20 nm) and high optical quantum yield, photoluminescence quantum yield (PLQY) up to 93%. The core/shell perovskites have enhanced optical stability under ambient conditions (70 d) and under ultraviolet radiation (50 h). The enhanced properties are attributed to overgrowth of FAPbBr3 with all‐inorganic CsPbBr3 shell, which acts as a protective layer and enables effective passivation of the surface defects. The use of these green‐emitting core/shell FAPbBr3/CsPbBr3 NCs is demonstrated in light‐emitting diodes (LEDs) and significant enhancement of their performance is achieved compared to core only FAPbBr3‐LEDs. The maximum current efficiency observed in core/shell NC LED is 19.75 cd A‐1 and the external quantum efficiency of 8.1%, which are approximately four times and approximately eight times higher, respectively, compared to core‐only devices.
中文翻译：
核/壳钙钛矿纳米晶体：用于LED应用的高效且环保的FAPbBr3 / CsPbBr3的合成
卤化钙钛矿型纳米晶体（PeNCs）是光电子应用中有希望的材料。然而，它们的环境不稳定性仍需解决，以使其能够进入工业。在这里，报道了一种新的合成方法的开发，该方法适用于在甲酰胺溴化铅（FAPbBr 3）NC的表面上外延生长的所有铯溴化铅（CsPbBr 3）无机壳包覆的单分散PeNC 。形成的FAPbBr 3 / CsPbBr 3NC在460-560 nm的可见光范围内具有光致发光，具有窄的发射线宽（20 nm）和高的光量子产率，光致发光量子产率（PLQY）高达93％。核/壳钙钛矿在环境条件（70 d）和紫外线辐射（50 h）下具有增强的光学稳定性。增强的性能归因于FAPbBr 3的全无机CsPbBr 3壳的过度生长，该壳充当保护层并能够有效钝化表面缺陷。这些发光绿色的核/壳FAPbBr 3 / CsPbBr 3 NC在发光二极管（LED）中得到了证明，与仅核的FAPbBr 3相比，其性能得到了显着提高。‐LED。在核心/外壳NC LED中观察到的最大电流效率为19.75 cd A -1，外部量子效率为8.1％，与仅核心器件相比，分别高出约4倍和约8倍。
更新日期：2020-08-03
中文翻译：
核/壳钙钛矿纳米晶体：用于LED应用的高效且环保的FAPbBr3 / CsPbBr3的合成
卤化钙钛矿型纳米晶体（PeNCs）是光电子应用中有希望的材料。然而，它们的环境不稳定性仍需解决，以使其能够进入工业。在这里，报道了一种新的合成方法的开发，该方法适用于在甲酰胺溴化铅（FAPbBr 3）NC的表面上外延生长的所有铯溴化铅（CsPbBr 3）无机壳包覆的单分散PeNC 。形成的FAPbBr 3 / CsPbBr 3NC在460-560 nm的可见光范围内具有光致发光，具有窄的发射线宽（20 nm）和高的光量子产率，光致发光量子产率（PLQY）高达93％。核/壳钙钛矿在环境条件（70 d）和紫外线辐射（50 h）下具有增强的光学稳定性。增强的性能归因于FAPbBr 3的全无机CsPbBr 3壳的过度生长，该壳充当保护层并能够有效钝化表面缺陷。这些发光绿色的核/壳FAPbBr 3 / CsPbBr 3 NC在发光二极管（LED）中得到了证明，与仅核的FAPbBr 3相比，其性能得到了显着提高。‐LED。在核心/外壳NC LED中观察到的最大电流效率为19.75 cd A -1，外部量子效率为8.1％，与仅核心器件相比，分别高出约4倍和约8倍。
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