Preparation and Optical Properties of Y2MgAl4SiO12:Ce3+ Fluorescent Ceramics by Pressureless Sintering
Y3Al5O12∶Ce3+(YAG∶Ce)phosphor is the main luminous material for white light emitting diode(LED)or laser diode(LD)at present,but it has some drawbacks such as aging due to poor heat dissipation.In this paper,Y2MgAl4SiO12∶Ce3+(YMAS∶Ce)transparent ceramic fluorophores were prepared by simple pressureless sintering,which can replace traditional fluorescent powder and regulate luminescence performance.The precursor powder was prepared by chemical coprecipitation method and calcined at high temperature.Green body disks were formed by cold isostatic pressing using the sintered powder.Finally,transparent fluorescent ceramics were prepared by calcin-ing the disks at 1 600℃temperature in a muffle furnace.The effect of Ce3+ doping concentration and sample thick-ness on the properties of the material was studied.The sample doped 0.5%of Ce3+ possessed 56%transmittance at 800 nm,and its luminescence intensity at 450 K is still maintain 84%of that at room temperature.The device com-bined with the fluorescent ceramics can emit white light under the excitation of blue LEDs/LDs.The corresponding CIE chromaticity coordinates were(0.307 6,0.332 9)and(0.308 0,0.331 6),and the luminous efficiency was 62.6 lm/W and 146.3 lm/W,respectively.The results show that YMAS∶Ce fluorescent ceramics can be applied to white LEDs/LDs.
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