Modulating Luminescence of Double Perovskites by Intrinsic Strain Effect and Applications in White Light Emitting Devices,Advanced Optical Materials

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Modulating Luminescence of Double Perovskites by Intrinsic Strain Effect and Applications in White Light Emitting Devices
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2024-01-22 , DOI: 10.1002/adom.202302494
Ying Wang ₁ , Haoyu Wang ₁ , Fan Zhang ₁ , Xingchen Dong ₁ , Wei Guan ₁ , Peng Wang ₁ , Shuo Zhang ₁ , Lina Sui ₁ , Zhixing Gan _{2,

3} , Lifeng Dong ₁ , Liyan Yu ₁

Affiliation

Double perovskite (DP) is considered as a promising candidate for single-component white-light emitters. However, the photoluminescence (PL) efficiency of the small sized DP, such as microcrystals and nanocrystals, is generally unsatisfactory. In this work, by comparing the Sb/Bi co-doped Cs₂NaInCl₆ microcrystals prepared at different conditions, it is revealed that the PL spectral profile and efficiency are highly dependent on intrinsic strain effect. All the Sb/Bi co-doped Cs₂NaInCl₆ DPs exhibit blue PL at ≈445 nm and yellow PL at ≈560 nm. When the crystal size decreases, the release of local strain results in a significant quenching in the emission intensity. Accordingly, by optimizing the reaction conditions to introduce sufficient lattice mismatch, high PL quantum yields (QYs) of 76.38% and 86.44% are obtained for blue and yellow PL, respectively. Moreover, a white light-emitting convertor with a high colour rendering index (CRI) of 90.0 is fabricated, which shows a luminous efficiency of 40.4 lm W⁻¹.

中文翻译：

本征应变效应调控双钙钛矿发光及其在白光发射器件中的应用

双钙钛矿（DP）被认为是单组分白光发射器的有前途的候选者。然而，小尺寸DP（例如微晶和纳米晶）的光致发光（PL）效率普遍不令人满意。在这项工作中，通过比较在不同条件下制备的Sb/Bi共掺杂Cs ₂ NaInCl ₆微晶，发现PL光谱轮廓和效率高度依赖于本征应变效应。所有Sb/Bi共掺杂Cs ₂ NaInCl ₆ DPs在约445 nm处呈现蓝色PL，在约560 nm处呈现黄色PL。当晶体尺寸减小时，局部应变的释放导致发射强度显着淬灭。因此，通过优化反应条件以引入足够的晶格失配，蓝色和黄色PL分别获得了76.38%和86.44%的高PL量子产率（QY）。此外，制造出具有90.0的高显色指数(CRI)的白光发光转换器，其发光效率为40.4lm W ^-1。

更新日期：2024-01-22

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