具有增强稳定性和发射的 FAPbBr3/Cs4PbBr6 核/壳钙钛矿纳米晶体：对 LED 的影响,ACS Applied Nano Materials

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具有增强稳定性和发射的 FAPbBr3/Cs4PbBr6 核/壳钙钛矿纳米晶体：对 LED 的影响
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-07-14 , DOI: 10.1021/acsanm.2c01772
Yicheng Zeng ₁ , Weiwei Chen _{2,

3} , Yuan Deng ₁ , Wanying Gu ₁ , Chenxi Wu ₁ , Yating Guo ₁ , Pan Huang ₁ , Fangze Liu ₁ , Hongbo Li ₁

Affiliation

甲脒溴化铅 (FAPbBr _{3 ) 纳米晶体 (NCs) 已被证明在 530 nm 处表现出理想的超纯绿色发光，并通过潜在地克服溴化铅铯 (CsPbBr}₃ ) NCs面临的困难而在发光二极管中保持巨大潜力。然而，与全无机卤化铅钙钛矿 NCs 相比，有机-无机杂化 FAPbBr _{3 NCs 由于其由有机阳离子（FA}⁺ ）引起的固有不稳定性而对水分、氧气和热敏感。_{在此，我们提出了一种外延生长方法，用于在 FAPbBr 3}表面过度生长大带隙铯铅卤化物 (Cs ₄ PbBr _{6 ) 壳层。}NC。所得核/壳 NC 显示出 97.1% 的近单位光致发光量子产率 (PLQY)、半峰全宽为 88 meV 的发射和长期环境稳定性。在FAPbBr ₃ NCs中引入Cs ⁺可以抑制FA ⁺的迁移并抑制60℃时从立方相到四方相的相变。此外，壳层的存在可以提供更强的激子限制，提高FAPbBr ₃ NCs的热稳定性。本研究开发的核壳型钙钛矿NCs具有PLQY高、稳定性好等优点，有望为发光二极管（LEDs）领域做出贡献。

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FAPbBr3/Cs4PbBr6 Core/Shell Perovskite Nanocrystals with Enhanced Stability and Emission: Implications for LEDs

Formamidinium lead bromide (FAPbBr₃) nanocrystals (NCs) have been demonstrated to exhibit ideal ultrapure green luminescence at 530 nm and to hold great potential in light-emitting diodes, by potentially overcoming the difficulties facing cesium lead bromide (CsPbBr₃) NCs. However, compared to all-inorganic lead halide perovskite NCs, organic–inorganic hybrid FAPbBr₃ NCs are sensitive to moisture, oxygen, and heat due to their intrinsic instability caused by the organic cations (FA⁺). Herein, we present an epitaxial growth method for the overgrowth of a large-band-gap cesium lead halide (Cs₄PbBr₆) shell on the surface of FAPbBr₃ NCs. The resulting core/shell NCs show a near-unity photoluminescence quantum yield (PLQY) of 97.1%, the emission with full width at half-maxima of 88 meV, and long-term environmental stability. The introduction of Cs⁺ into FAPbBr₃ NCs can inhibit the migration of FA⁺ and suppress the phase transformation from cubic phase to tetragonal phase at 60 °C. Furthermore, the existence of shell can provide stronger exciton confinement and improve the thermal stability of FAPbBr₃ NCs. The core/shell perovskite NCs developed in this study have the advantages of high PLQY and good stability and may contribute to the field of light-emitting diodes (LEDs).

更新日期：2022-07-14

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