研究目的
To solve the problem of low color rendering index (CRI) in current mainstream WLEDs based on blue chip and Y3Al5O12:Ce3+ yellow phosphor by designing a novel yellowish-green phosphor Ca1.5Y1.5Al3.5Si1.5O12:Ce3+ (CYAS:Ce3+) based on garnet structure.
研究成果
The CYAS:Ce3+ phosphor exhibits potential in the warm WLED application due to its efficient and thermal-stable yellowish-green emission, robust luminescence intensity, and color stability resistance to temperature. A good warm white light with low CCT (3210 K), high CRI (85.1) and luminous efficacy (88.5 lm/W) has been achieved by fabricating the CYAS:Ce3+, red phosphor CaAlSiN3:Eu2+ with blue LED chip.
研究不足
The study focuses on the luminescence properties and thermal stability of CYAS:Ce3+ phosphor, but the practical application in WLED devices may require further optimization in terms of efficiency and cost.
1：Experimental Design and Method Selection:
The CYAS:Ce3+ samples were prepared via a conventional solid state method. The raw materials were weighed, ground, and sintered in a tube furnace at 1400 oC for 5h under a reducing atmosphere of N2-H
2：Sample Selection and Data Sources:
Stoichiometric proportions of the raw materials including CaCO3, Y2O3, Al2O3, H2SiO3, and CeO2 were used.
3：List of Experimental Equipment and Materials:
X-ray Diffractometer (Bruker D2 PHASER), scanning electron microscopy (SEM; Hitachi S-4800), transmission electron microscopy (TEM, FEI Tecnai F30), UV-vis spectrophotometer (PE lambda950), spectrofluorometer (Horiba Jobin Yvon, Fluorolog-3).
4：3).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The samples were characterized by XRD, SEM, TEM, DRS, PL, and PLE spectra measurements. High temperature spectra measurements were carried out using an aluminum plaque with cartridge heaters.
5：Data Analysis Methods:
The total energy, band structure and elastic moduli of CYAS were calculated according to the density functional theory (DFT).
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