Double-layer YAG:Ce/(Gd,Y)AG:Ce composite transparent ceramic phosphor for white light LED packaging, and preparation method thereof
A technology of LED encapsulation and transparent ceramics, applied in ceramic layered products, chemical instruments and methods, energy-saving lighting, etc., can solve the problems of reducing white light luminous efficiency, low color rendering index, lack of red light, etc., and achieve high optical transmission The effect of high efficiency, good repeatability and simple process
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[0037] Another aspect of the present invention provides a preparation method of the composite transparent ceramic phosphor. As an example, the following steps may be included.
[0038] (1) Preparation of raw material mixed powder.
[0039] In one example, the raw material mixed powder can be prepared by a solid phase method. Specifically, using yttrium oxide (Y 2 o 3 ), alumina (Al 2 o 3 ), gadolinium oxide (Gd 2 o 3 ), cerium oxide (CeO 2 ) as raw material, according to (Ce x Y 1-x ) 3 Al 5 o 12 and (Ce y Gd z Y 1-y-z ) 3 Al 5 o 12 (where 0.0005≤x≤0.05, 0.0005≤y≤0.05, 0.25≤z≤0.75) composition Accurately weigh two kinds of powder raw materials, use absolute ethanol or deionized water as the dispersion medium to carry out wet ball milling and mix evenly, ball milling The rotation speed can be 80-200rmp / min, and the ball milling time can be 5-12 hours; then the mixed powders are dried and sieved to obtain YAG:Ce powder and (Gd,Y)AG:Ce powder. In order to remo...
Embodiment 1
[0050] Using yttrium oxide (Y 2 o 3 ), alumina (Al 2 o 3 ), gadolinium oxide (Gd 2 o 3 ), cerium oxide (CeO 2 ) as raw material, according to (Ce 0.001 Y 0.999 ) 3 Al 5 o 12 and (Ce 0.001 Gd 0.25 Y 0.749 ) 3 Al 5 o 12 Composition Accurately weigh 60g of each of the two powder materials, and then use absolute ethanol as the dispersion medium for ball milling and mixing. After ball milling for a certain period of time, the two powders are dried, sieved, and calcined at 600°C for 4 hours; It was pressed into tablets, and subjected to 200MPa cold isostatic pressing to form a green body; then it was put into a vacuum or hot-pressed sintering furnace and sintered at 1780 ° C and 1720 ° C for 20 hours, so as to obtain (Ce 0.001 Y 0.999 ) 3 Al 5 o 12 and (Ce 0.001 Gd 0.25 Y 0.749 ) 3 Al 5 o 12 Transparent ceramics, the obtained two transparent ceramic materials are polished to obtain ceramics with high optical quality. The lower layer (Ce 0.001 Gd 0.50 Y ...
Embodiment 2
[0052] For (Ce 0.001 Y 0.999 ) 3 Al 5 o 12 and (Ce 0.001 Gd 0.25 Y 0.749 ) 3 Al 5 o 12 Holding temperature is 1780 ℃ and 1720 ℃ respectively, and holding time is 10 hours, and other conditions are the same as embodiment 1, can obtain equally (Ce 0.001 Y 0.999 ) 3 Al 5 o 12 and (Ce 0.001 Gd 0.25 Y 0.749 ) 3 Al 5 o 12 Transparent ceramic. The lower layer (Ce 0.001 Gd 0.50 Y 0.449 ) 3 Al 5 o 12 The transparent ceramic is ground and polished to 0.3mm, the upper layer (Ce 0.001 Y 0.999 ) 3 Al 5 o 12 The transparent ceramics are ground and polished to 0.3 mm, and their composite structure is obtained by adding commercial silica gel to two ceramic sheets. Under the excitation of 465nm blue light, high-quality white light with soft color and high luminous efficiency can be obtained. The color temperature of this composite transparent ceramic phosphor is 4299K and the luminous efficiency is 131lm / w when it is excited by an 80mA blue light chip at room te...
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