具有深蓝色发射的金属有机框架中无铅 Cs3Cu2I5 量子点的自发形成,Small

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具有深蓝色发射的金属有机框架中无铅 Cs3Cu2I5 量子点的自发形成
Small ( IF 13.0 ) Pub Date : 2022-05-08 , DOI: 10.1002/smll.202107161
Yuqing Zhang ₁ , Yong He ₁ , Zhenyu Tang ₁ , Wenjin Yu ₁ , Zehao Zhang ₁ , Zhijian Chen ₁ , Lixin Xiao ₁ , Jun-Jie Shi ₁ , Shufeng Wang ₁ , Bo Qu ₁

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全无机无铅Cs ₃ Cu ₂ I ₅ 钙钛矿衍生物量子点（QDs）由于其无毒和独特的光电特性而引起了极大的关注。然而，传统的热注射方法需要高温和多个配体来限制量子点的生长。本文报道了一种在室温（RT）下在金属-有机框架（MOFs）MOF-74中自发合成超小Cs ₃ Cu ₂ I _{5 QDs的策略，平均直径为4.33 nm。}得到的Cs ₃ Cu ₂ I ₅ 由于强量子限制效应，量子点表现出明显的深蓝色发射，国际照明委员会坐标为 (0.17, 0.07)。由于MOF-74的保护，Cs ₃ Cu ₂ I ₅ QDs表现出优异的稳定性，在相对湿度超过70%的环境下储存1440 h后，光致发光量子产率仍保持在初始值的89%。_{此外，在 Cs 3} Cu ₂ I ₅的复合材料中观察到三重态-三重态湮没上转换发射@MOF-74，它带来了明显的温度依赖性光致发光。这项研究揭示了一种在室温下制造超小型无铅钙钛矿衍生物量子点的简便方法，无需多个配体。_{此外，Cs 3} Cu ₂ I ₅ @MOF-74的温度依赖性光致发光可能为开发温度传感器或其他相关光电器件的应用开辟一条新途径。

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Spontaneous Formation of Lead-Free Cs3Cu2I5 Quantum Dots in Metal–Organic-Frameworks with Deep-Blue Emission

All-inorganic lead-free Cs₃Cu₂I₅ perovskite-derivant quantum dots (QDs) have attracted tremendous attention due to their nontoxicity and unique optoelectronic properties. However, the traditional hot-injection method requires high temperatures and multiple ligands to confine the growth of QDs. Herein, a strategy is reported to spontaneously synthesize ultrasmall Cs₃Cu₂I₅ QDs within metal–organic-frameworks (MOFs) MOF-74 at room temperature (RT) with an average diameter of 4.33 nm. The obtained Cs₃Cu₂I₅ QDs exhibit an evident deep-blue emission with Commission Internationale de L'Eclairage coordinates of (0.17, 0.07), owing to the strong quantum confinement effect. Due to the protection of MOF-74, the Cs₃Cu₂I₅ QDs demonstrate superior stability, and the photoluminescence quantum yield retains 89% of the initial value after the storage of 1440 h under the environment with relative humidity exceeding 70%. Besides, triplet–triplet annihilation upconversion emission is observed within the composite of Cs₃Cu₂I₅@MOF-74, which brings out apparent temperature-dependent photoluminescence. This study reveals a facile method for fabricating ultrasmall lead-free perovskite-derivant QDs at RT without multiple ligands. Besides, the temperature-dependent photoluminescence of Cs₃Cu₂I₅@MOF-74 may open up a new way to develop the applications of temperature sensors or other related optoelectronic devices.

更新日期：2022-05-08

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