研究目的
To realize all-inorganic perovskite-phase RbPbBr3 and investigate its crystal structure, phase transition, band gap, and optical properties for potential use in optoelectronic devices.
研究成果
Perovskite-phase RbPbBr3 was realized through a chemical vapor deposition and a high-temperature annealing process. It can serve as a gain medium and microcavity to achieve single-mode lasing with a high Q of about 2100. The lasing wavelength can be tuned continuously from blue to green (475–540 nm) by modulating the microcavity size and/or the ratio of monovalent cation.
研究不足
Perovskite-phase RbPbBr3 is unstable at room temperature and transforms to a PL-inactive non-perovskite structure when exposed to a natural environment.
1：Experimental Design and Method Selection:
A dual-source chemical vapor deposition and a high-temperature annealing process were developed to realize perovskite-phase RbPbBr
2：Sample Selection and Data Sources:
Non-perovskite RbPbBr3 microspheres were prepared first through a dual-source chemical vapor process, then annealed at 290 °C for 1 h to obtain perovskite structures.
3：List of Experimental Equipment and Materials:
Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and photoluminescence (PL) spectroscopy were used.
4：Experimental Procedures and Operational Workflow:
The phase transition from non-perovskite to perovskite was confirmed by XRD. PL and absorption spectra of perovskite-phase RbPbBr3 were measured.
5：Data Analysis Methods:
The crystal structures, XRD patterns, and band structures were theoretically analyzed using density functional theory (DFT).
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