Preparation method of LED remote excitation fluorescent powder layer
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A phosphor layer and remote excitation technology, which is applied to semiconductor devices of light-emitting elements, light sources, lighting and heating equipment, etc. problems such as light extraction efficiency, to avoid yellowing and light decay, simplify the packaging process, and improve the effect of small production capacity
Inactive Publication Date: 2018-03-06
北国之光(辽宁)科技有限公司
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The main problems of the white light obtained in this way are: the mixed white light has uneven spatial chromaticity, macular and blue spots; The effect of heat on the surface of the chip makes the phosphor decay faster, resulting in the bluer the white light color will be as the usage time is longer.
These methods have certain limitations and disadvantages. For example, when spraying, self-sedimentation, and screen printing methods are used, they can only be carried out on a flat surface, but cannot be carried out on a curved or spherical surface. It is necessary to add a transparent cover or milky white protective cover outside the shell, which will reduce the light extraction efficiency. In addition, the service life of the organic resin will also affect the reliability and long-term stability of the lamp product
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Embodiment 1
[0032] A preparation method for LED remote excitation phosphor layer, characterized in that: the method comprises the following steps:
[0033] (1) Preparation of alumina suspension: mix alumina and deionized water according to the required ratio to obtain a suspension with uniform dispersion of alumina;
[0034](2) Configure the adhesive: according to the needs, select the surface adhesive material used to configure the transparent colloid with the required concentration;
[0035] (3) Configure surfactant: obtain a certain concentration of surfactant solution;
[0036] (4) Prepare phosphor powder paste: according to the required luminescent characteristics, weigh a certain amount of phosphor powder, add the three solutions prepared in steps (1), (2), and (3), and stir well to obtain Phosphor paste required;
[0037] (5) Phosphor powder slurry coating and drying: use the selected coating method to coat the phosphor powder slurry on the inner wall of the lampshade, and then d...
Embodiment 2
[0040] According to the preparation method of the LED remote excitation phosphor layer described in Example 1, in the step (1), the alumina used is ultrafine nanometer γ-phase alumina, and its particle size is nano-scale particle size distribution , the concentration of the prepared alumina suspension is 10%~20%.
Embodiment 3
[0042] According to the preparation method of LED remote excitation phosphor layer described in embodiment 1 or 2, in step (2), the binder used is a water-soluble binder, mainly including polyethylene oxide, polyvinyl alcohol, hydroxyl One or more of ammonium methylcellulose, polyacrylic acid, ammonium polyacrylate, and polymethacrylic acid are mixed, and the concentration of the prepared water-soluble binder is 1% to 10%.
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Abstract
The invention discloses a preparation method of an LED remote excitation fluorescent powder layer. The preparation method is characterized by comprising the following steps that (1), aluminum oxide suspension is prepared; (2), a bonding agent is prepared; (3), a surfactant is prepared; (4), fluorescent powder slurry is prepared, specifically, a certain mass of fluorescent powder is weighed according to the needed luminescent characteristics, the three solutions prepared in the step (1), the step (2) and the step (3) are added, full and uniform stirring is conducted, and the needed fluorescentpowder slurry is obtained; (5), the fluorescent powder slurry is applied and dried, specifically, the fluorescent powder slurry is applied to the inner wall of a lampshade through a selected applyingmethod and then dried, and a fluorescent powder colloid layer with the uniformly-dispersed fluorescent powder is obtained; and (6), the temporary bonding agent is removed, specifically, the organic temporary bonding agent in the fluorescent powder colloid layer is removed as needed, and the final needed fluorescent powder layer is obtained. According to the preparation method, the process is simple, the operability is high, the production efficiency can be improved to a great extent, and the product property can be improved.
Description
technical field [0001] The present invention relates to the field of optoelectronic technology, in particular to a technique for preparing a phosphor layer in a direction far away from the surface of an LED chip, a white light LED light color mixing technique for phosphor conversion, a light extraction technique for improving light extraction efficiency, and an improvement in the space color of white light. White light technology with uniformity. Background technique [0002] LED is the abbreviation of light emitting diode. In 1993, a breakthrough was made in blue LED technology using GaN as the light-emitting material, and on this basis, LED white light emission was realized in 1996. Because LED has the advantages of low-voltage drive, full solid-state, high luminous efficiency, low power consumption, and high reliability, the application research of white LED devices in lighting-related fields has also been highly valued by academia and industry. It is an environmentally ...
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