研究目的
The high-precision patterning of metal halide perovskites (MHPs) is of paramount importance for their device application. The study aims to demonstrate the femtosecond (fs)-laser-assisted formation of three-dimensional MHP nanocrystal (NC) patterns with strong blue photoluminescence (PL) inside an oxide glass.
研究成果
The study successfully demonstrates the laser printing of perovskite NCs with blue emission inside a borosilicate glass, enabling the localized formation of CsPb(Cl/Br)3 NCs with switchable PL. This approach offers a simple strategy for creating emissive patterns inside a stable and transparent solid matrix, with potential applications in information storage, three-dimensional displays, and information security protection.
研究不足
The study does not explicitly mention limitations, but potential areas for optimization could include the resolution of the patterns and the efficiency of the laser-induced crystallization process.
1：Experimental Design and Method Selection
The methodology involves the use of femtosecond laser irradiation and subsequent thermal treatment to induce the localized crystallization of CsPb(Cl/Br)3 NCs inside a borosilicate glass. The process enables the crystallization and erasing of NCs localized around the laser focal area.
2：Sample Selection and Data Sources
Precursor glass samples were prepared using the melting-quenching method with reagent grade SiO2, B2O3, ZnO, NaCl, NaBr, Cs2CO3, and PbO as raw materials.
3：List of Experimental Equipment and Materials
A regeneratively amplified Ti:sapphire laser with a central wavelength at 800 nm, pulse duration of 130 fs, and a repetition rate of 1 kHz was used for laser patterning. The glass samples were cut and polished for fs laser processing and optical measurements.
4：Experimental Procedures and Operational Workflow
The laser beam was focused to 500 μm beneath the glass surface through a 10× objective lens. After laser irradiation, the glass samples were annealed at different temperatures for CsPb(Cl/Br)3 NC formation. The erasing of NC patterns was carried out by using the same femtosecond laser, and the recovery process was conducted by annealing the glass samples.
5：Data Analysis Methods
Optical and fluorescent images were captured using a Nikon microscope. PL spectra were collected by a spectrometer. Absorption spectra were recorded on a spectrophotometer, and Raman spectra were measured with a Raman spectrometer.
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