铯铅卤（CsPbX，X=Br 和 I）钙钛矿纳米晶体中组成依赖性的热载流子弛豫动力学。
Composition-Dependent Hot Carrier Relaxation Dynamics in Cesium Lead Halide (CsPbX , X=Br and I) Perovskite Nanocrystals.
机构信息
Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
Device Laboratory, Samsung Advanced Institute of Technology, Suwon, Gyeonggi-do, 16676, Republic of Korea.
出版信息
Angew Chem Int Ed Engl. 2017 Apr 3;56(15):4160-4164. doi: 10.1002/anie.201611916. Epub 2017 Mar 20.
Cesium-based perovskite nanocrystals (NCs) have outstanding photophysical properties improving the performances of lighting devices. Fundamental studies on excitonic properties and hot-carrier dynamics in perovskite NCs further suggest that these materials show higher efficiencies compared to the bulk form of perovskites. However, the relaxation rates and pathways of hot-carriers are still being elucidated. By using ultrafast transient spectroscopy and calculating electronic band structures, we investigated the dependence of halide in Cs-based perovskite (CsPbX with X=Br, I, or their mixtures) NCs on the hot-carrier relaxation processes. All samples exhibit ultrafast (<0.6 ps) hot-carrier relaxation dynamics with following order: CsPbBr (310 fs)>CsPbBr I (380 fs)>CsPbI NC (580 fs). These result accounts for a reduced light emission efficiency of CsPbI NC compared to CsPbBr NC.
基于铯的钙钛矿纳米晶体（NCs）具有出色的光物理性质，可提高照明设备的性能。对钙钛矿 NCs 中激子特性和热载流子动力学的基础研究进一步表明，与钙钛矿的体相形式相比，这些材料表现出更高的效率。然而，热载流子的弛豫速率和途径仍在阐明之中。通过使用超快瞬态光谱和计算电子能带结构，我们研究了卤化物在基于铯的钙钛矿（CsPbX，其中 X=Br、I 或其混合物）NCs 中对热载流子弛豫过程的依赖关系。所有样品均表现出超快（<0.6 ps）的热载流子弛豫动力学，其顺序为：CsPbBr（310 fs）>CsPbBr I（380 fs）>CsPbI NC（580 fs）。这些结果表明，与 CsPbBr NC 相比，CsPbI NC 的光发射效率降低。
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