研究目的
To solve the problem of achieving white light with high luminance and high directionality from laser-driven solid-state lighting by introducing uniform spherical pores into phosphor ceramics to act as light scattering centers.
研究成果
The introduction of uniform spherical pores into phosphor ceramics effectively confines the luminescent spot size, enhances the central illuminance, and improves the directionality and uniformity of laser-driven white light. A porosity of 15% was found to be optimal, achieving a 46% reduction in light spot diameter and a 156% increase in central illuminance. The high-scattering ceramics show great potential for use in high-luminance laser-driven lighting and projection applications.
研究不足
The study primarily focuses on the optical and thermal properties of YAG:Ce ceramics with controlled porosity. The practical application in laser-driven lighting systems may require further optimization of the ceramic's mechanical properties and long-term stability under continuous laser irradiation.
1：Experimental Design and Method Selection:
The study involved the fabrication of YAG:Ce ceramics with controlled porosity to act as color converters for laser-driven lighting. The ceramics were designed to have varying levels of porosity to study the effect on light confinement and directionality.
2：Sample Selection and Data Sources:
High-purity Al2O3, Y2O3, and CeO2 powders were used to fabricate the YAG:Ce ceramics. PMMA particles were introduced as pore-forming agents to control porosity.
3：List of Experimental Equipment and Materials:
Equipment included a high-resolution field emission scanning electron microscope, confocal laser scanning microscope, steady-state fluorescence spectrometer, absolute PL quantum yield spectrometer, UV–vis spectrophotometer, and a home-made measurement system for thermal quenching behavior. Materials included high-purity powders, PMMA particles, and silicone resin.
4：Experimental Procedures and Operational Workflow:
The ceramics were fabricated by ball milling, pressing into disks, sintering under controlled atmospheres, and bonding to Ag-coated Al substrates. The optical and thermal properties were then characterized.
5：Data Analysis Methods:
The light confinement ability was quantified by measuring the luminescent spot size and central illuminance. The thermal conductivity and conversion efficiency were also analyzed.
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Absolute PL quantum yield spectrometer
C11347
Hamamatsu
Used to measure the internal quantum efficiency and absorption efficiency at the excitation of 450 nm.
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UV–vis spectrophotometer
UV-3600Plus
Shimadzu
Used to obtain transmittance spectra of the YAG:Ce ceramics.
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CCD spectrometer
USB2000+
Ocean optics
Part of a home-made measurement system used to measure thermal quenching behavior.
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Microscope digital camera
DP74
Olympus
Used to measure the light confinement ability of YAG:Ce ceramics.
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Imaging colorimeter
ProMetric IC-PMI16
Radiant
Used to measure the luminance distribution of the YAG:Ce ceramics in a transmissive configuration.
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CCD spectrometer
HR4000
Ocean Optics
Connected to the integrating sphere to measure optical properties.
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Laser power meter
F100A-PF-DIF-33
Ophir
Used to measure the optical power of the blue laser.
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IR thermal imager
TIX580
Fluke
Used to measure the surface temperature of YAG:Ce ceramics.
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Silicone resin
OE-6630A, B
Dow Corning
Binding material used to bond YAG:Ce ceramics to Ag-coated Al substrates.
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High-resolution field emission scanning electron microscope
SU-70
Hitachi
Used for microstructure observations of the YAG:Ce ceramics.
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Confocal laser scanning microscope
TCS SP8
LEICA
Used to observe the distribution of pores in the ceramic.
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Steady-state fluorescence spectrometer
FLS980
Edinburgh Instruments
Used to record photoluminescence excitation and emission spectra at room temperature.
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Al2O3
TAIMEI Chemical Co. Ltd.
High-purity powder used in the fabrication of YAG:Ce ceramics.
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Y2O3
Aladdin
High-purity powder used in the fabrication of YAG:Ce ceramics.
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CeO2
Aladdin
High-purity powder used in the fabrication of YAG:Ce ceramics.
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TEOS
Aladdin
Sintering aid used in the fabrication of YAG:Ce ceramics.
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PVB
Aladdin
Adhesive used in the fabrication of YAG:Ce ceramics.
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PMMA
Kbsphere
Pore-forming agent used to control porosity in YAG:Ce ceramics.
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Ag-coated Al substrates
MIRO-SILVER 4 4400AG
Alanod
Highly reflective substrates used in the fabrication of YAG-Al plates and phosphor wheels.
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Cooling/heating stage
THMS600E
Linkam Scientific Instruments
Part of a home-made measurement system used to measure thermal quenching behavior.
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