Method for controlling thickness of coating fluorescent dye for white light LED
A coating thickness and control method technology, which is applied in the field of white LED phosphor coating thickness control, can solve the problems of uneven thickness of phosphor powder, angular color temperature difference, etc., and achieve the effect of uniform powder layer and high yield
Inactive Publication Date: 2008-08-27
JIANGSU SUN & MOON LIGHTING
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Problems solved by technology
[0003] The object of the present invention is to provide a method for controlling the coating thickness of fluorescent powder, which can solve the problem of angular color temperature difference caused by uneven thickness of fluorescent powder
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0011] The method for coating the thickness of the white light LED fluorescent powder of the present invention,
[0012] 1. Take YAG fluorescent powder for ball milling to make the particle size 3-8um.
[0013] 2. Use 250-mesh and 300-mesh nylon nets to remove the finer or coarser phosphor particles in the ball-milled YAG phosphor.
[0014] 3. Mix epoxy resin glue with fluorescent powder, the specific gravity of the mixed colloid is 1.50-1.55g / cm 3 , The viscosity is 43S.
[0015] 4. Preheat the chip with hot air at 40-45°C before coating.
[0016] 5. Dry the colloid-coated chip for 5 seconds at 40-45°C.
[0017] The color coordinates of the large-sized LED produced by the method of the invention are (0.3192, 0.3361), very close to the ideal white light point (0.33, 0.33), the color rendering index is about 80, and the color temperature is in the range of 5000-10000K.
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Abstract
Issue of uneven thickness of coated LED phosphor powder used by people currently is main reason to cause difference of angle color temperature of white light LED. The invention realizes even thickness for coating LED phosphor powder through following technical handlings: controlling granularities of phosphor powder at 3-8 micros; controlling specific gravity and viscosity of admixture of gelatin powder at 1.25-1.60g / cm3, and 20-60S; carrying out preheating by hot air under 30-90 deg.C before coating chip; drying through a certain time under 30-90 deg.C after coating. The invention possesses features of high yield, and even powder layer.
Description
Technical field [0001] The invention relates to a method for controlling the coating thickness of white LED fluorescent powder, and belongs to the technical field of optoelectronic luminescence. Background technique [0002] LED (light-emitting diode, Light-Emitting Diode) is a type of light-emitting device that can directly convert electrical energy into visible light and radiant energy. It has low operating voltage, low power consumption, high luminous efficiency, extremely short luminous response time, and pure light color. , Strong structure, shock resistance, vibration resistance, stable and reliable performance, light weight, small size, low cost and a series of characteristics, the development is advancing by leaps and bounds. Among them, white LEDs based on gallium nitride GaN blue chips are a research and development hotspot for compound semiconductors and even the entire optoelectronics and semiconductor industry. White LED is a new type of semiconductor all-solid...
Claims
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IPC IPC(8): H01L33/00
Inventor 徐向阳唐建华
Owner JIANGSU SUN & MOON LIGHTING