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
View PDF4 Cites 19 Cited by
  • 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 conduciv

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composite white light LED and preparation method
  • Composite white light LED and preparation method
  • Composite white light LED and preparation method

Examples

Experimental program
Comparison scheme
Effect test

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...

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, ta...

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.

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
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Luminous wavelengthaaaaaaaaaa
Base radiusaaaaaaaaaa
Login to view more

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

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
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap