研究目的
Investigating the Dy-doped YAG transparent ceramic as an ultraviolet excited single-phase white-emitting phosphor for high-power LEDs applications.
研究成果
The Dy-doped YAG transparent ceramic exhibits high quantum efficiency and good optical and thermal properties, making it suitable for high-power LEDs applications. The CIE coordinate is close to the standard equal energy white light illumination.
研究不足
The study is limited to room temperature measurements and does not explore the performance under varying temperature conditions. The quantum efficiency decreases with increasing Dy concentration, indicating concentration quenching.
1：Experimental Design and Method Selection:
The Dy-doped YAG transparent ceramics were synthesized using the vacuum reactive sintering method. A reverse strike coprecipitation method was adopted to prepare the Y2O3 and Dy2O3 powders.
2：Sample Selection and Data Sources:
The commercial Al2O3 (
3：99% purity, α-phase) were used as the raw materials. List of Experimental Equipment and Materials:
UV-VIS-NIR spectrometer (Carry 5000, Agilent), Scanning electron microscope (S-4800, Hitachi), fluorescence spectrometer (FLS920P, Edinburgh), heat-flow method detector (DRL-III, XiangYi), 365 nm UV-LED chip, spectrometer (PR650, Photo Research), digital camera (D90, Nikon).
4：Experimental Procedures and Operational Workflow:
The powders were weighed, mixed, dried, sieved, pressed, CIPed, sintered, and annealed. All measurements were conducted at room temperature.
5：Data Analysis Methods:
The fluorescence lifetime and quantum efficiency were measured and analyzed.
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UV-VIS-NIR spectrometer
Carry 5000
Agilent
Measuring transmittance and absorption spectra
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Scanning electron microscope
S-4800
Hitachi
Examining microstructure of the samples
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Fluorescence spectrometer
FLS920P
Edinburgh
Recording steady fluorescence intensity, excitation spectra and fluorescence decay curves
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Heat-flow method detector
DRL-III
XiangYi
Measuring thermal conductivities
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UV-LED chip
365 nm
Electroluminescence characterization
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Spectrometer
PR650
Photo Research
Detecting Commission Internationale de l’éclairage (CIE)
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Digital camera
D90
Nikon
Recording photographs
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