A white light LED device with uniform light emitting color temperature in a spatial solid angle and a packaging method thereof

A LED device, three-dimensional technology, applied in the direction of semiconductor devices, electrical components, circuits, etc., can solve the problems of increasing the complexity and incompatibility of the packaging process, and achieve the effect of improving the extraction ability, expanding the divergence angle, and improving the reflection ability

Inactive Publication Date: 2017-12-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slurry method, electrophoresis method and thermal evaporation method are not compatible with the equipment currently used by LED packaging companies, and significantly increase the complexity of the packaging process

Method used

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  • A white light LED device with uniform light emitting color temperature in a spatial solid angle and a packaging method thereof
  • A white light LED device with uniform light emitting color temperature in a spatial solid angle and a packaging method thereof
  • A white light LED device with uniform light emitting color temperature in a spatial solid angle and a packaging method thereof

Examples

Experimental program
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Effect test

Embodiment ( 1

[0047] In this embodiment, a total of 9 groups of samples are designed, of which groups 1 to 8 are LED devices with a double-layer structure, and group 9 is a reference sample with a single-layer structure. First, mix A and B silica gel according to the ratio of 1:1, stir evenly, vacuum defoam and put it into the syringe. Set the air pressure of the dispenser to 330Kpa and the time to 0.1s. For 1 to 8 groups of samples, drop 3 drops of silica gel on the top of the LED blue light chip, and then move the LED bracket attached to the silica gel into a 150°C vacuum drying oven. Set the baking time to 2 hours. Among them, the first sample has been dried upright; the second group of samples was firstly dried in the reverse direction for 10 minutes, and then forwardly dried; the third group of samples was first reversely dried for 20 minutes, and then forwardly dried; the fourth group of samples First dry in the reverse direction for 30 minutes, and then dry in the forward direction;...

Embodiment ( 2

[0060] For samples 1# to 8#, replace the upper layer of phenyl high-refractive index silica gel with methyl low-refractive index silica gel to construct a gradient refractive index, and use the same method as Example (1) to package white LED devices; 9# sample is the upper layer and the lower layer Both are methyl low-refractive-index silica gels, and are packaged with white light LED devices in the same way as in Example (1). Figure 9-10 A comparison of the luminous intensity of a white LED device with a double-layer structure with a gradient refractive index structure packaged by the present invention as a function of current and a white LED device with a uniform refractive index structure is given. Such as Figure 9 For groups 1 to 4 of samples that were reverse-dried for 0, 10, 20 and 30 minutes and then forward-dried, the luminous intensity is almost higher than that of the 9# sample with a single refractive index, and the greater the current, the greater the effect mor...

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Abstract

The invention discloses a white LED device of uniform illuminant color temperature at the spatial solid angle and a packaging method of the LED device. The white LED device comprises an LED support with a reflector lamp cup, the reflector lamp cup is internally provided with an LED chip, and a rotary table structure is arranged on the LED support; and the rotary table structure is formed by fitting a lower layer planar concave lens layer and an upper layer planar convex lens layer. The invention also provides a packaging method of the white LED device. The planar concave lens layer is conducive to increasing the light emitting divergence angle of the LED, and the inverted planar convex lens is also conducive to increasing the light emitting divergence angle of the LED, so that white light which is highly uniform in the divergence angle range of a stereo space can be obtained; and the lower-layer planar concave lens layer and the upper-layer planar convex lens layer can be packaged by high-refraction silica gel and low-reflectivity silica gel respectively, and the gradient index structure from the chip to the external air layer is conducive to improving the extraction rate of emitted light of the white LED device.

Description

technical field [0001] The invention relates to a white light LED device, its encapsulation structure and manufacturing method. Specifically, a layer of high-refractive silica gel layer without phosphor powder is first coated on the top of the chip, and a planar concave lens structure with a concave upper surface is formed by placing it upright or upside down for different times, and then injecting a mixture of phosphor powder into the upper layer of the concave structure. Low refractive index silica gel or silica gel with the same refractive index, after curing, an inverted planar convex lens structure phosphor layer with a horizontal upper surface and a convex lower surface is formed. This double-lens structure not only helps to improve the uniformity of color temperature, but also helps to improve the extraction rate of emitted light from the LED device with the gradient refractive index structure from inside to outside. Background technique [0002] As a new type of lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/58H01L33/54H01L33/60H01L33/50H01L33/00
CPCH01L33/005H01L33/505H01L33/54H01L33/58H01L33/60H01L2933/0025H01L2933/005H01L2933/0058
Inventor 陈雷赵二龙张昭陈秀玲费米
Owner HEFEI UNIV OF TECH
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