Composite white light LED and preparation method

A technology of LED chips and white light, which is applied in the direction of electrical components, circuits, semiconductor devices, etc., can solve the problems of energy loss, low luminous efficiency of composite white light LED, unfavorable light energy extraction, etc., achieve low cost, save quantum dot materials, Reduce the effect of total reflection

Inactive Publication Date: 2016-10-26
TIANJIN ZHONGHUAN QUANTUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing package structure of composite white light LED, the morphology of the quantum dot layer and the phosphor layer is mostly planar without special design, which is not conducive to the extraction of light energy; and the mutual absorption between the quantum dot and phosphor layer The effect leads to energy loss, resulting in low luminous efficiency of composite white LED

Method used

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  • Composite white light LED and preparation method
  • Composite white light LED and preparation method
  • Composite white light LED and preparation method

Examples

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preparation example Construction

[0040] The preparation method of this composite white light LED comprises the following steps, such as figure 2 Shown:

[0041] S1. Apply fluorescent powder glue. Apply the fluorescent powder colloid 1003 directly above the LED chip 1002 through the dispensing device 1007 to cover the LED chip 1002 to form a hemispherical or spherical shape, then put it into an oven, and heat at 150°C for 1 hour , to cure the phosphor glue;

[0042] S2. Prepare the quantum dot light-transmitting shell. Mix 2mL of methyl methacrylate solution with 0.01g of azobisisobutyronitrile powder, add quantum dots, and ultrasonically oscillate for 10 minutes, then place the mixed solution in a water bath at 70°C for 10 minutes, and then absorb 3~ 40 μL was injected into the inner surface of the light-transmitting housing 1006, and then placed in a heating box at 45°C for 12 hours to solidify the solution;

[0043] S3. Package of compound white light LED. The light-transmitting housing 1006 obtained ...

Embodiment 1

[0045] S1. Apply fluorescent powder glue. In this embodiment, phosphor particles with a particle size of 12 μm and a light emission wavelength of 555 nm are used. The colloid of the phosphor glue is heat-curable silica gel of A / B component, and the curing temperature is 150° C. The chip size used is 0.5 mm x 0.5 mm x 0.1 mm. First, mix 0.1g of phosphor particles with 0.5g of glue A and 0.5g of glue B and stir them evenly, then put them into a vacuum box to vacuum for 30 minutes; then apply the prepared phosphor colloid on the top of the LED to form a radius Hemispherical shape of 1.5mm; put it into an oven and heat at 150°C for 1 hour to solidify the phosphor colloid;

[0046] S2. Prepare the quantum dot shell. In this embodiment, a light-transmitting housing with a diameter of 30 mm is used, and its material is polycarbonate (PC), with a light transmittance of 95%. The composition of quantum dots is CdSe / ZnS, and the emission wavelength is 630nm. First, mix 2mL of methyl ...

Embodiment 2

[0049] Repeat Example 1 with the same steps as described, the difference is that the phosphor powder adopts an average particle diameter of 18um, and the phosphor powder with a luminous wavelength of 540nm, and the quantum dot adopts a CdSSe / ZnS quantum dot with a luminous wavelength of 630nm; 0.2g phosphor powder The particles are mixed with 0.5g glue A and 0.5g glue B to make phosphor colloid, and then the prepared phosphor colloid is spot-coated on the LED to form a spherical shape with a bottom radius of 1.5mm and a height of 1.2mm ; After mixing 2mL methyl methacrylate solution with 0.01g azobisisobutyronitrile powder, add 5mg quantum dots to prepare a mixed solution, take 30 μL mixed solution and inject it into the light-transmitting shell, and finally obtain the quantum dots in the quantum dot shell. The middle thickness of the dot film is about 1.2mm, and the edge thickness is about 0.9mm. The resulting composite white LED such as image 3 shown.

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Abstract

The invention discloses a composite white light LED which comprises a substrate, an LED chip and a transparent casing. The bottom of the LED chip is fixed to the surface of the substrate. The upper part of the substrate is sleeved by a transparent shell. The upper part of the LED chip is covered with phosphor colloid. The inner surface of the transparent shell is attached with a quantum dot film. An air gap is between the quantum dot film and the phosphor colloid. The invention also discloses a preparation method of the composite white light LED. Since the air gap is between the phosphor colloid and a quantum dot shell, the air gap can prevent the absorption effect between quantum dot emitting light and fluorescent powder emitting light, the quantum dot film and a fluorescent powder layer are curved surface topographies, the removal of light energy is facilitated, and thus the light emitting efficiency of the composite white light LED is improved significantly. The operation method is simple, the cost is low, the thicknesses, topographies and compositions of the phosphor colloid and the quantum dot film can be flexibly controlled, thus the composite white light LED with high color performance is obtained, and the composite white light LED is suitable for mass production.

Description

technical field [0001] The invention belongs to the field of LED packaging, and more specifically relates to a composite 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. 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] The current commercialized white light LEDs use blue LED chips to excite yellow phosphors, and the transmitted blue light is mixed with the excited yellow li...

Claims

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Application Information

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IPC IPC(8): H01L33/48H01L33/50
CPCH01L33/48H01L33/483H01L33/505H01L2933/0033H01L2933/0041
Inventor 安娜马昊玥卢睿杨磊唐秀梅李春峰边盾
Owner TIANJIN ZHONGHUAN QUANTUM TECH CO LTD
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