Fluorescent and transparent polycarbonate grating for LED (light-emitting diode) and preparation method for same

A polycarbonate, transparent technology, applied in the direction of electrical components, circuits, grain processing, etc., can solve the problems of polycarbonate composition light transmittance drop, visual fatigue, human eye irritation, etc., to improve glare and uneven light distribution , improve yield and consistency, solve the effect of uneven coating

Inactive Publication Date: 2013-04-17
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, domestic enterprises generally adopt high-power white LEDs, mainly by adding phosphor powder on blue LED chips to achieve white light. However, it is difficult to control the coating thickness and shape of phosphor powder in this packaging process, resulting in the uniformity of color temperature of LED devices. Still not ideal, even the angular color temperature difference of a single LED can be as large as 800K, while the color temperature difference that human eyes can distinguish is 50-100K
On the other hand, the existing LED lamp beads / luminaires generally use the LED light source to emit directly toward the lighting space (usually the ground), because the light emitted by the LED is not uniform, which is irritating to the human eye and seriously affects the LED lamps. The lighting effect is easy to cause visual fatigue or even vision loss. This is the light pollution that often exists in LED lamp beads / luminaires - the glare problem
[0003] Chinese invention patent CN102337017A discloses a polycarbonate composition with LED light conversion function and its application, which is characterized in that polycarbonate resin, additives (additives include: phosphor, flame retardant, antioxidant, mold release agent, weather resistance agent) mixed in a certain proportion and melted and extruded by a screw extruder. There is no coupling agent and dispersant in these additives, which will lead to uneven dispersion of phosphor powder during the extrusion molding process, resulting in polycarbonate The light transmittance of the ester composition decreases, it is difficult to obtain a light conversion material with excellent performance, and it will adversely affect the optical performance of the material after long-term use

Method used

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  • Fluorescent and transparent polycarbonate grating for LED (light-emitting diode) and preparation method for same

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preparation example Construction

[0051] The preparation method of the fluorescent transparent polycarbonate grating for LED of the present invention, comprises the following steps:

[0052] A) Sieve material, use a 150-mesh test to screen out polycarbonate powder with a particle size of 30-90um

[0053] B) Prepare materials, weigh polycarbonate powder and fluorescent powder with a particle size of 30-90um according to the mass ratio, and obtain raw materials

[0054] C) Mixing, put the weighed raw materials into the frequency conversion planetary ball mill for mixing, the speed of the frequency conversion planetary ball mill is 160-250r / min, and the mixing time is 1-5h to obtain the mixture

[0055] D) Drying, putting the mixed material into a vacuum constant temperature drying oven for drying, the drying temperature is 50-120° C., and the drying time is 3-20 hours to obtain a dried mixed material. The maximum moisture content of polycarbonate powder is <0.020%

[0056] E) Compounding additives, weigh tetra...

Embodiment 1

[0063] Embodiment 1: Prepare the raw materials required for preparing the product of the present invention: polycarbonate powder, yellow fluorescent powder, antioxidant 1010, antioxidant 168, organic silicon light diffusing agent, the specific ratio of each component is as described in Table 1 . The implementation steps are as follows:

[0064] A) Sieve material, use a 150-mesh test to screen out polycarbonate powder with a particle size of 30-90um

[0065] B) Prepare materials, according to the mass ratio of the components in Example 1 in Table 1, weigh polycarbonate and yellow phosphor with a particle size of 30-90um

[0066] C) Mixing, put the weighed polycarbonate powder and fluorescent powder into a variable frequency planetary ball mill for mixing, the speed of the variable frequency planetary ball mill is 160-250r / min, and the mixing time is 1-5h to obtain a mixture

[0067] D) Drying, putting the mixed material into a vacuum constant temperature drying oven for dryin...

Embodiment 2

[0077] Only the ingredients in steps B) and E) in Example 1 are changed to the ingredients according to the mass ratio of the components in Example 2 in Table 1, and the rest are the same as the description in Example 1.

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Abstract

The invention provides a preparation method for a fluorescent and transparent polycarbonate grating for an LED (light-emitting diode). The materials of the fluorescent and transparent polycarbonate grating for an LED are composed of polycarbonate, fluorescent powder, an antioxidant, a coupling agent and a light dispersing agent. The fluorescent and transparent polycarbonate grating for an LED is formed by performing the preparation processes of sieving, preparing, mixing, drying, matching with auxiliaries, mixing, banburying, forming, annealing, cutting, etching and the like on the composition materials. The fluorescent and transparent polycarbonate grating can be used for an LED lamp bead / lamp, for adjusting the colour temperature of the LED, and solving the problems of the glare of the LED, the non-uniform distribution of the traditional silica gel fluorescent powder, and the like. The problem of non-uniform coating of the fluorescent powder is effectively solved, so that the light-emitting efficiency, the service life and the light spectrum stability of the white-light LED are improved; and moreover, the fluorescent and transparent polycarbonate grating is relatively simple in structure and preparation process, high in reliability, low in cost, good in plasticity and capable of being widely applied to LED manufacturing, as well as opens up unprecedented flexibility and creativity for the field of light sources.

Description

technical field [0001] The invention relates to the preparation of LED light-emitting materials and semiconductor lighting, in particular to a fluorescent transparent polycarbonate grating which can be used in the high-power LED light-emitting field and a preparation method thereof. Background technique [0002] White LED is considered as a "green lighting source" because of its significant advantages such as high efficiency, low power consumption, long life, solid-state energy saving, and environmental protection. It is expected to become the third-generation lighting source after incandescent lamps and fluorescent lamps. development potential. At present, domestic enterprises generally adopt high-power white LEDs, mainly by adding phosphor powder on blue LED chips to achieve white light. However, it is difficult to control the coating thickness and shape of phosphor powder in this packaging process, resulting in the uniformity of color temperature of LED devices. Still no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08K13/02C08K5/54C08K5/13C08K5/134C08K5/526B29B7/28B29C35/02B29C43/02B29C59/16B29B13/06B02C17/10H01L33/58H01L33/50
Inventor 肖瑶范广涵郑树文张涛皮辉陈志武贺龙飞
Owner SOUTH CHINA NORMAL UNIVERSITY
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