Fluorescent powder coating liquid of white light emitting diode as well as preparation method and coating method thereof

A technology of light-emitting diodes and phosphors, applied in luminescent coatings, devices for coating liquid on the surface, coatings, etc., can solve the problem of further migration, sedimentation or agglomeration of phosphors, inability to effectively protect against ultraviolet radiation, and LED color drift etc. to improve reliability and stability, reduce attenuation, and reduce thermal quenching

Active Publication Date: 2011-04-06
FOSHAN NATIONSTAR OPTOELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned traditional phosphor coating methods are prone to the following problems: 1. Organic colloids (such as epoxy and silicone) cannot effectively protect against ultraviolet radiation, resulting in damage to the phosphor, such as aging attenuation, color drift, etc.
The literature "Research on Phosphor Powder Aging in White LED" (Foshan Institute of Science and Technology (Natural Science Edition), 2007, 25(4), 6-8) analyzed and confirmed that the attenuation of the conversion rate of phosphor powder under thermal effect and current effect is One of the important factors affecting the aging of white light LED; patent CN201062757Y (Zhu Jianping) is to change the phosphor layer to the l

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0025] Embodiment 1: Phosphor powder coating solution is composed of silica sol, phosphor powder and deionized water with weight percentages of 60%, 35% and 5%, respectively. Among them, the silica sol is an inorganic compound nano-silica sol; the function of deionized water is to adjust the viscosity of the coating solution. In other embodiments, distilled water can be used instead of deionized water; in further embodiments, reinforcing agents, plasticizers and dispersants can also be added as additives.

[0026] The silica sol in this embodiment belongs to the nano glue, and the nano glue itself has a "coating" effect on the phosphor powder, which reduces the damage of ultraviolet radiation to the phosphor powder and reduces the thermal quenching of the phosphor powder, thereby reducing the phosphor powder. Attenuation and color drift of light-emitting diodes and improve the aging resistance of light-emitting diodes. The phosphor powder coating liquid of the white light emi...

Example Embodiment

[0028] Example 2: At room temperature, slowly pour 60% of neutral silica sol, 5% of deionized water, and other additives (such as reinforcing agent, plasticizer, and dispersant) into a ball mill filled with 35% phosphor In the tank, add a certain amount of grinding balls to mix the mill. Wherein the weight ratio of the agate grinding balls whose diameters are respectively φ6, φ10, φ15 depends on the required particle size, and the preferred ratio of this example is 2:1:1. The speed of the ball mill is 90n / min, and the grinding time is about 4 hours. The silica sol in this embodiment is an inorganic polymer after being cured, which does not generate segmental thermal movement, and has better compatibility with the inorganic phosphor. The reliability and stability of the LED are thus improved.

[0029] An embodiment of the present invention provides a coating method based on the above-mentioned phosphor coating liquid for white light emitting diodes. The coating liquid is adde...

Example Embodiment

[0030]Embodiment 3: Add the prepared coating solution to the liquid precision quantitative dispensing device to dispensing and coating the LED chip, and place the coated chip in an oven at 100-150°C for 20-30 minutes to let the solvent evaporate completely , and then resin encapsulation process. Among them, an oven curing condition of 120° C. and 20-30 minutes is the preferred solution. Compared with traditional organic packaging materials, the above coating liquid has a higher refractive index, which can further improve the light extraction efficiency of packaging devices.

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Abstract

The invention provides a method for configuring a fluorescent powder coating liquid of a white light emitting diode. The fluorescent powder coating liquid of the white light emitting diode includes the fluorescent powder and a binder, wherein the binder is an inorganic compound nanometer silica sol, and the inorganic compound nanometer silica sol and the fluorescent powder have weight percentage ratios of 60-85% and 40-15%. The method includes: slowly pouring the silica sol into a ball mill with 15%-40% of fluorescent powder, then adding ball mill balls with diameters of phi6, phi10, phi15 and a weight ratio of 2:1:1 for mixing and milling. The fluorescent powder coating liquid has the advantages that the membrane enveloping effect on the fluorescent powder is realized by utilizing the nano silica sol; the damage of the harmful ultraviolet radiation on the fluorescent powder is reduced; and the hot quenching property of the fluorescent powder is lowered so that the attenuation of the fluorescent powder and the color bleaching of the light emitting diode are reduced, and the aging resistance property of the light emitting diode is improved.

Description

technical field [0001] The invention relates to the technical field of packaging of white light emitting diodes, in particular to a white light emitting diode fluorescent powder coating solution and a preparation method and coating method thereof. Background technique [0002] Light-emitting diodes (LEDs) have the advantages of high efficiency, energy saving, and environmental protection. The technological progress of white LEDs has created conditions for LEDs to enter the field of general lighting. LEDs are generally considered by the industry to be the main lighting source in the 21st century. Technically, the realization of white light LED mainly includes: use RGB (red, green, blue) three primary colors multiple chips or multiple devices to emit light and mix them into white; apply RGB phosphor powder on the ultraviolet light chip, and use purple light to excite the phosphor powder Produce three-primary color mixing to form white light, or coat YAG (yttrium aluminum garn...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D5/22C09D7/12B05C9/14H01L33/00
Inventor 余彬海李绪锋李程陈灿伟
Owner FOSHAN NATIONSTAR OPTOELECTRONICS CO LTD
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