研究目的
Investigating the design and luminescence properties of a broadband NIR phosphor for security-monitoring LEDs, focusing on the tunable photoluminescence properties and enhanced thermal stability through chemical composition modification.
研究成果
The study successfully designed a broadband NIR phosphor LaSc2.93-yGayB4O12(LSGB): 0.07Cr3+ (y = 0.6) with tunable photoluminescence properties and enhanced thermal stability, making it suitable for blue-pumped security-monitoring LEDs. The results demonstrate the potential of chemical composition modification in optimizing Cr3+-doped borate NIR phosphors.
研究不足
The study focuses on the chemical composition modification to enhance luminescence properties and thermal stability, but further optimization and application in practical devices are needed.
1：Experimental Design and Method Selection
The study involves the synthesis of LaSc3-xB4O12(LSB): xCr3+ (0 ≤ x ≤ 0.09) and LaSc2.93-yGayB4O12(LSGB): 0.07Cr3+ (0 ≤ y ≤ 1.6) phosphors by solid-state reaction at high temperature. The methodology includes phase formation measurement, Rietveld refinement of XRD patterns, and examination of excitation and emission spectra.
2：Sample Selection and Data Sources
Raw materials include La2O3 (99.99%), Sc2O3 (99.99%), Ga2O3 (99.99%), H3BO3 (A.R.), and Cr2O3 (99.95%).
3：List of Experimental Equipment and Materials
MiniFlex 600 X-ray powder diffractometer (XRD) (Rigaku, Japan), spectrofluorometer (FluoroMax-4, Horiba, Japan), FLS-980 lifetime and steady state spectrometer (Edinburgh Instruments Ltd., UK).
4：Experimental Procedures and Operational Workflow
Mixtures were ground, heated at 1200 °C for 3 h, and cooled to room temperature. Phase formation was measured by XRD, and luminescence properties were examined by spectrofluorometer and FLS-980 spectrometer.
5：Data Analysis Methods
Rietveld refinement was performed using the Gsas program. The luminescence properties were analyzed based on excitation and emission spectra, decay curves, and temperature-dependent emission spectra.
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