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A kind of white light led fluorescent film and LED based on fluorescent film

A fluorescent film and LED chip technology, which is applied to electrical components, circuits, semiconductor devices, etc., can solve problems such as poor uniformity, poor consistency of light emission and color temperature of devices, and lower price, and achieve strong light transmittance and stability , Avoid the rise of working temperature, the effect of controllable shape and thickness

Active Publication Date: 2018-06-15
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this process will directly conduct the heat generated by the chip to the phosphor layer, as the application of high-power chips becomes more and more common, this process will cause the phosphor adhesive layer to change color due to thermal degradation and aging, directly affecting the powder layer. The light output rate, which in turn limits the luminous efficiency of the LED lamp, and even causes the entire LED to fail to emit light and lose the lighting or display function.
[0004] In the existing reports of LED fluorescent film, the luminescent material is mainly phosphor powder, and the film prepared in this way may have poor uniformity due to the precipitation of phosphor powder and separation caused by the film being placed for too long. Poor, which in turn leads to poor luminous consistency and color temperature consistency of the device, making it difficult to meet customer needs
[0005] In addition, the luminescent material used in the currently reported white LED fluorescent film is still mainly YAG yellow phosphor. The main component of the phosphor is rare earth elements, which are non-renewable resources, and the price is relatively high, which makes the production cost of LED higher.
Moreover, in recent years, due to the large-scale production of LEDs, the reserves have continued to increase, and the selling price has continued to decrease. This trend is not conducive to the development of the LED lighting industry.

Method used

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  • A kind of white light led fluorescent film and LED based on fluorescent film
  • A kind of white light led fluorescent film and LED based on fluorescent film
  • A kind of white light led fluorescent film and LED based on fluorescent film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A new type of white LED fluorescent film excited by ultraviolet light is formed by mixing and curing two-component organic silica gel, fluorescent carbon dot solution and red phosphor powder.

[0035] A new type of white light LED based on the above-mentioned fluorescent film, which mainly includes: an ultraviolet LED chip 1, a fluorescent film 2 and a wire 3. The positive and negative electrodes are drawn out from the ultraviolet LED chip 1 through the wire 3 to prepare for electrification. Chip type" packaging method is directly packaged on the ultraviolet LED chip 1 to form an LED that emits white light under ultraviolet excitation.

[0036] The preparation method of the above-mentioned novel white light LED comprises the following steps:

[0037] (1) Preparation of carbon dot fluorescent materials

[0038] During the stirring process, 0.05 mL of ethylenediamine (AR, content ≥ 99 (%)) was added dropwise to 20 mL of citric acid aqueous solution with a concentration o...

Embodiment 2

[0046] (1) Preparation of carbon dot fluorescent materials

[0047] The preparation process of the carbon dot fluorescent material in this example is the same as that in Example 1.

[0048] (2) Pretreatment of carbon dot fluorescent materials

[0049] The pretreatment process of the carbon dot fluorescent material in this example is the same as the pretreatment process in Example 1.

[0050] (3) Preparation of fluorescent film

[0051] Measure 10 ml of the solution outside the bag after the above dialysis treatment in a beaker, and evaporate to remove 90% of the water. At the same time, weigh 2.500g of type A integrated silica gel, 2.500g of type B integrated silica gel, and 0.002g of R6733 commercial red powder and mix them evenly. The first curing is carried out in a drying oven, wherein the first curing condition is 75°C for 90 minutes, and the second curing is carried out after the mold is removed, and the condition is 130°C for 6 hours to obtain a fluorescent film. Th...

Embodiment 3

[0055] (1) Preparation of carbon dot fluorescent materials

[0056] The preparation process of the carbon dot fluorescent material in this example is the same as that in Example 1.

[0057] (2) Pretreatment of carbon dot fluorescent materials

[0058] The pretreatment process of the carbon dot fluorescent material in this example is the same as the pretreatment process in Example 1.

[0059] (3) Preparation of fluorescent film

[0060] Measure 10 ml of the solution outside the bag after the above dialysis treatment in a beaker, and evaporate to remove 90% of the water. At the same time, weigh 2.500g of type A integrated silica gel, 2.500g of type B integrated silica gel, and 0.002g of R6733 commercial red powder and mix them evenly. The first curing is carried out in a drying oven, wherein the first curing condition is 75°C for 90 minutes, and the second curing is carried out after the mold is removed, and the condition is 130°C for 6 hours to obtain a fluorescent film. Th...

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PUM

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Abstract

The invention discloses a novel white light LED fluorescent film excited by ultraviolet light. The LED based on the fluorescent film and its preparation method comprises mixing and curing two-component organic silica gel, fluorescent carbon dot solution and red fluorescent powder, vacuumizing and removing bubbles, and slowly Pour it into a mold, put it in an oven to cure at 75°C, remove the mold and then cure it at 130°C to obtain a fluorescent film. The above fluorescent film is packaged on the ultraviolet LED chip by "chip type". The fluorescent film of the present invention greatly reduces the amount of fluorescent powder used, has the advantages of simple preparation process, controllable shape and thickness, uniform material dispersion, low cost, etc. "type" package on the ultraviolet LED chip, has considerable application prospects.

Description

technical field [0001] The invention relates to the technical field of LEDs, in particular to a novel white LED fluorescent film excited by ultraviolet rays, an LED based on the fluorescent film and a preparation method thereof. Background technique [0002] White LED is the fourth-generation lighting source after incandescent lamps, fluorescent lamps and energy-saving lamps. Compared with the previous three generations of lighting sources, white LEDs have the advantages of high luminous efficiency, high color rendering, long life, energy saving and environmental protection, etc., which continue to attract the research interest of scientists. [0003] Most of the white light LEDs currently sold in the market are packaged by directly dispensing phosphor layers. Since this process will directly conduct the heat generated by the chip to the phosphor layer, as the application of high-power chips becomes more and more common, this process will cause the phosphor adhesive layer t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/50
CPCH01L33/502H01L2933/0041
Inventor 陈叶青陈世旺岑国标王超何鑫张梅
Owner WUYI UNIV
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