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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AI-Extracted 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 conduciv...

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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.

Application Domain

Semiconductor devices

Technology Topic

FluorescenceAbsorption effect +9

Image

Examples

Experimental program(8)
Comparison scheme(1)

Example Embodiment

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

[0041] S1. Apply phosphor glue. The phosphor colloid 1003 is dispensed directly above the LED chip 1002 through the dispensing equipment 1007, covering the LED chip 1002 to form a hemispherical or spherical shape, and then placed in an oven, heated at 150°C for 1 hour , to cure the phosphor glue;

[0042] S2, preparing a quantum dot light-transmitting shell. After mixing 2 mL of methyl methacrylate solution with 0.01 g of azobisisobutyronitrile powder, quantum dots were added, and ultrasonically oscillated for 10 minutes. Then the mixed solution was water-bathed at 70 °C for 10 minutes, and then 3~3~ 40 μL was injected into the inner surface of the light-transmitting shell 1006, and then placed in a heating box at 45°C for 12 hours to cure the solution;

[0043] S3, the package of composite white LED. The light-transmitting housing 1006 obtained in S2 is mounted on the substrate 1001 to complete the encapsulation of the composite white LED.

Example Embodiment

[0044]Example 1

[0045] S1. Apply phosphor glue. In this example, phosphor particles with a particle size of 12 μm and an emission wavelength of 555 nm are used, and the colloid of the phosphor glue adopts A/B component thermosetting silica gel, and the curing temperature is 150°C. The size of the chip used is 0.5mm×0.5mm×0.1mm. First, mix 0.1g phosphor particles with 0.5g A glue and 0.5g B glue and stir evenly, and then put it into a vacuum box and vacuumize for 30 minutes; then apply the prepared phosphor colloid on the top of the LED to form a radius It is a hemispherical shape of 1.5mm; it is then placed in an oven and heated at 150°C for 1 hour to solidify the phosphor colloid;

[0046] S2, preparing the quantum dot shell. In this embodiment, a light-transmitting casing with a diameter of 30 mm is used, and the material is polycarbonate (PC), and the light transmittance is 95%. The quantum dot composition is CdSe/ZnS, and the emission wavelength is 630 nm. First, take 2 mL of methyl methacrylate solution and mix it with 0.01 g of azobisisobutyronitrile powder, add 3 mg of quantum dots, ultrasonically vibrate for 10 minutes, then put the mixed solution in a water bath at 70 °C for 10 minutes, and then draw from the mixed solution 20 μL was injected into the inner surface of the light-transmitting shell with the opening facing upward, and then put it into a heating box at 45°C for 12 hours to cure the solution; the middle thickness and edge thickness of the quantum dot film in the final prepared quantum dot shell were both about 0.9 mm;

[0047] S3, the package of composite white LED. The quantum dot shell obtained in S2 is mounted on the substrate to complete the encapsulation of the composite white light LED. Its preparation process is as figure 2 As shown, the resulting composite white LED is as figure 1 shown.

Example Embodiment

[0048] Example 2

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

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PUM

Property	Measurement	Unit
Thickness	0.05 ~ 3.0	mm
Luminous wavelength	450.0 ~ 700.0	nm
Base radius	0.7 ~ 1.5	mm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Improve light extraction efficiency
Reduce total reflection

Composite white light LED and preparation method

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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