Effects Of Dopant On The Luminescence Of YAG:Ce³⁺ Phosphors

Rare earth luminescent materials are widely used in lighting, display, imaging, medicalradiology images, the detection of the radiation field and records and other fields. YAG:Ce3+phosphor is a kind of yellow fluorescent material. It has high efficiency, energy saving, longlife and other characteristics, is extensively researched and applied. Combustion method hasthe advantages of simple, efficient, energy-saving, there is great value in the synthesis andpreparation of new materials.This article uses the nitrate, urea as raw materials, combustion method synthesis ofYAG:Ce3+, and study the impact of urea concentration and different levels of Ti4+, Li+,Gd3+and B3+doping and the dosage of drugs and the improve of furnace temperature and heattreatment on YAG:Ce3+luminescence characteristics. The samples were characterized byXRD analysis and fluorescence spectroscopy to determine the structure and luminescenceproperties. The XRD analysis showed that the main phase of sample is Y3Al5O12. Thefluorescence spectrum showed that the sample was excited under the blue light wavelength ofabout456nm, the sample emits yellow light of the main peak at about535nm. Thephotoluminescence spectrum of crystalline YAG：Ce3+phosphors showed the high emissionintensity when the urea concentration was the1.2molar ratio with the stoiehiometric YAG：Ce3+composition．By doping experiments Ti4+, Li+and B3+do not make the YAG: Ce3+emission spectrum of the blue shift or red shift. The color-rendering index of YAG:Ce3+phosphors after doping Gd3+. Doping of Ti4+the fluorescence intensity will be reduced, andthe Li+B3+and Gd3+doped appropriate the fluorescence intensity can be enhanced, whereinGd3+/H3BO3co-doped phosphors enhanced performance for the most obvious. By dopingexperiments, it was concluded that YAG:Ce3+yellow phosphor with high emission intensityand high the color-rendering index can be synthesized by Gd-H3BO3co-doped. Throughspectral image analysis can be obtained: when content of Ti4+doping is1.0%, thefluorescence intensity of the sample is the strongest; when content of Li+doping is0.5%, thefluorescence intensity of the sample is the strongest; and when content of B3+doping is0.8%,the fluorescence intensity of the sample is the strongest; when content of Gd3+doping is1.5%, the fluorescence intensity of the sample is the strongest. Experiments show that the increasein the amount of drugs can enhance the YAG:Ce3+luminous intensity. But improve furnacetemperature for the improvement of fluorescence intensity of the sample is not obvious. Afterheat treatment, the fluorescence intensity of the sample has greatly improved.