Optical Property Behaviors of CsPbBr3 Colloidal Nanoparticles in a Ligand-Assisted Reprecipitation Process
Optical Property Behaviors of CsPbBr3 Colloidal Nanoparticles in a Ligand-Assisted Reprecipitation Process
复制标题
CsPbBr3 胶体纳米粒子在配体辅助再沉淀过程中的光学性质行为
DOI：
10.1021/acs.cgd.0c00143
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发表时间：
2020-08-05
影响因子：
3.8
通讯作者：
Cao, Dawei
中科院分区：
文献类型：
--
作者：
Chen, Mingming;Yuan, Youwen;Cao, Dawei
最近，全无机铯铅卤化物钙钛矿CsPbX 3（X = Cl、Br和I）胶体纳米颗粒（NP）因其在发光器件中的潜在应用而引起了人们的极大关注。更好地理解胶体纳米粒子在生长过程中的光学性质行为对于可控合成具有所需发光性能的CsPbX 3至关重要。在这项工作中，生长的CsPbBr3纳米粒子在配体辅助再沉淀过程中的光学性质的行为进行了研究，通过原位光致发光（PL）光谱。结果表明，生长温度和时间等生长参数对CsPbBr3纳米粒子的光学性质有重要影响。具体而言，生长的CsPbBr3纳米颗粒发射的高能光子具有广泛的半峰全宽（fwhm）的早期阶段的增长，而延长生长时间导致的PL光谱变窄和红移的光子发射。同时，这种PL发射演化行为可以通过调节生长温度来进一步调制。在此基础上，提出了制备具有不同发光性能的CsPbBr3纳米颗粒的最佳生长参数，包括生长温度和时间。
Recently, all-inorganic cesium lead halide perovskite CsPbX3 (X = CI, Br, and I) colloidal nanoparticles (NPs) have attracted tremendous attention owing to their potential applications in light-emitting devices. A better understanding of optical property behaviors of the colloidal NPs during the growth process is of vital importance toward the controllable synthesis of CsPbX3 with desired luminescence properties. In this work, the optical property behaviors of as-grown CsPbBr3 NPs in the ligand-assisted reprecipitation process have been investigated via in situ photoluminescence (PL) spectroscopy. It showed that the growth parameters including growth temperature and time play important roles in determining the optical properties of the CsPbBr3 NPs. Specifically, the as-grown CsPbBr3 NPs emitted high-energy photons with a broad full width at half-maximum (fwhm) within the early stage of growth, while prolonging the growth duration led to a narrowing of PL spectra and a redshift of photon emission. Meanwhile, such PL emission evolution behaviors can be further modulated by tuning the growth temperature. On this basis, the optimized growth parameters including growth temperature and time for the fabrication of CsPbBr3 NPs with various luminescence properties were finally proposed.