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White light LED and preparation method thereof

An LED chip, white light technology, applied in semiconductor devices, electrical components, circuits, etc., can solve the problems of uncontrolled quantum dot film morphology, poor color uniformity and optical consistency, low utilization rate of quantum dot film, etc. Improve optical consistency, improve color uniformity, save quantum dot material effect

Inactive Publication Date: 2016-03-30
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to cut the flat film to fit the size of the LED chip, and remove the uneven area on the edge, so the utilization rate of the quantum dot film is low, the quantum dot material is wasted, and the production cost is increased.
At the same time, because the spatial distribution of the light emitted by the LED chip is Lambertian, which is strong in the middle and weak on both sides, directly encapsulating the planar quantum dot film on the LED chip will also make the light emission of the white LED show the characteristics of strong in the middle and weak at the edge. , so color uniformity and optical consistency are poor
Although methods such as magnetron sputtering and electrospinning can directly prepare curved films on the surface of LED chips, these methods not only require the use of expensive precision equipment, but also the morphology of quantum dot films cannot be freely controlled. The chip is covered with a thin film. Once the preparation fails, the chip will be wasted, thereby increasing the production cost.

Method used

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  • White light LED and preparation method thereof
  • White light LED and preparation method thereof
  • White light LED and preparation method thereof

Examples

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preparation example Construction

[0042] The preparation method of this white light LED comprises the following steps, such as figure 1 Shown:

[0043] S1. Coating quantum dot colloid with a volume of 10% to 77.5% of the volume of the transparent housing 1004 on the inner surface of the transparent housing 1004, or spot-coating on the top of the transparent housing 1004, Make it infiltrate the inner surface of the light-transmitting shell; wherein, the light transmittance of the light-transmitting shell is greater than 90%, and its shape is hemispherical, equi-polygonal, cylindrical or spherical, with a diameter of 0.3mm-1.0mm glue injection hole; the quantum dot colloid includes quantum dot particles with a mass fraction of 0.05%-1%, a polymer matrix with a mass fraction of 10%-50%, and a mass fraction of 49%-89.5% An organic solvent, the polymer matrix is ​​one or more of polymethyl methacrylate, polycarbonate, polystyrene or silica gel, and the organic solvent is one of toluene, methylene chloride or chlor...

Embodiment 1

[0050] S1. This embodiment adopts a hemispherical curved surface mold with an inner surface radius of 3mm. The mold material is polycarbonate (PC), the light transmittance is 95%, and a glue injection hole with a diameter of about 0.3mm is opened on the top. The composition of quantum dots is CdSe / ZnS, the emission wavelength is 650nm, and the mass fraction of quantum dots is 0.1%. The organic solvent component is toluene, and the mass fraction is 87.5%. The polymer matrix component is PMMA with a mass fraction of 12.4%. First, place the curved surface mold 1004 with the opening facing upward on the constant temperature heating substrate 1006, heat the constant temperature heating substrate 1006 to 40°C, wait for 30 minutes and then the temperature of the curved surface mold is stable, and then use the dispensing equipment 1007 to dispense 15 μl of quantum dot glue 1003 On the inner surface of the curved surface mold 1004, the quantum dot colloid will wet the inner surface of...

Embodiment 2

[0054] Repeat Example 1 with the same steps as described, the difference is that the CdSSe / ZnS quantum dots with a luminous wavelength of 650nm are used to replace the CdSe / ZnS quantum dots, the volume of the quantum dot colloid is 20 μl, and due to the large volume of the quantum dot colloid, the obtained The middle thickness of the film is about 0.9mm, and the edge thickness is about 0.7mm, such as image 3 As shown, this morphology is suitable for COB-packaged white light LEDs. Covering a nearly uniform quantum dot film on top of COB LEDs can match the luminous characteristics of the COB module, which is strong in the middle and weak at the edges, and obtain uniform spatial color and high color rendering index. Higher white LEDs.

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Abstract

The invention discloses a white light LED. The white light LED comprises a substrate, an LED chip and a transmitting shell, wherein the bottom of the LED chip is fixed on the surface of the substrate; the upper part of the LED chip is sleeved by the transmitting shell; a quantum dot thin film is adhered to the inner surface of the transmitting shell; and encapsulation glue is filled between the transmitting shell and the substrate. The invention furthermore discloses a preparation method of the white light LED. According to the white light LED and the preparation method, the operation method is simple, the cost is low, and the thickness, morphology and ingredients of the quantum dot thin film can be flexibly controlled, so that the optical consistency and space color uniformity of the white light quantum dot LED are improved; and the quantum dot thin film is prepared on a batch produced curved surface die, but not directly dispensed on the LED chip, so that the rejection rate of the quantum dot LED products is effectively decreased and the preparation method is suitable for the large-scale production of white light quantum dot LEDs.

Description

technical field [0001] The invention belongs to the field of quantum dot LED packaging, and more specifically relates to a white light LED and a preparation method thereof. Background technique [0002] Semiconductor lighting is a new lighting technology based on high-efficiency white light-emitting diodes (WhiteLightEmittingDiode, WLED). Compared with traditional lighting sources, it has the advantages of high luminous efficiency, low power consumption, high reliability and long life, and is recognized as one of the most promising high-tech fields in the 21st century. At the same time, flat panel display technology based on white LED backlight has developed rapidly in recent years and has become a new economic growth point. It is estimated that by 2020, my country's white light LED-related output value is expected to reach one trillion yuan. [0003] In the prior art, when encapsulating quantum dot white light LEDs, a planar quantum dot film is usually prepared first, and...

Claims

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Application Information

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IPC IPC(8): H01L33/48H01L33/50
CPCH01L33/483H01L33/502H01L33/507H01L2933/0033H01L2933/0041
Inventor 罗小兵谢斌余兴建商博锋马预谱程焱华
Owner HUAZHONG UNIV OF SCI & TECH
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