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Method and device for improving color temperature consistency of white light LED (Light Emitting Diode) lighting device

A technology of LED lighting and consistency, applied in the direction of electric solid-state devices, semiconductor devices, electrical components, etc., can solve the problems of difficulty in adjusting the thickness of LED chip phosphors, high consistency, and the inability to meet the luminous color temperature of array LED devices in large quantities, etc. Achieve the effect of improving color temperature (or wavelength) consistency and improving color temperature consistency

Active Publication Date: 2012-12-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, it is difficult to adjust the thickness of the phosphor required for each LED chip in the array by the above method of prefabricating the film, and it is impossible to control the emission wavelength of the LED lighting device on-line in real time during the manufacturing process, and it is impossible to meet the emission color temperature of the array LED device lighting in large batches. , high consistency, low cost requirements

Method used

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  • Method and device for improving color temperature consistency of white light LED (Light Emitting Diode) lighting device
  • Method and device for improving color temperature consistency of white light LED (Light Emitting Diode) lighting device

Examples

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Effect test

Embodiment 1

[0030] Example 1: Implementation of phosphor powder coating method for improving color temperature consistency of single-chip LED lighting devices

[0031] Such as figure 1 As shown, it is assumed that the manufacturing target of the LED lighting device is: the color temperature range is K 0 ±Δk. For example: positive white LED: 6250±250k. (White LED lighting devices manufactured by traditional methods have a color temperature range of 3200-7000k, and rely on subsequent sorting to classify devices with various color temperatures to obtain devices with a specific color temperature range, such as: 6250±250k But such a method has low yield and high cost. By adopting the method of the present invention, LED lighting devices with a color temperature of 6250±250k can be directly obtained without sorting.)

[0032] For the LED chips fixed on the substrate, cover the light-transmitting mirror and spray silica gel on the light-transmitting mirror, using glue spraying, rolling coatin...

Embodiment 2

[0038] Example 2: Implementation of phosphor powder coating method for improving color temperature consistency of array chip LED lighting devices

[0039] Assume that the manufacturing target of LED lighting devices is: the range of light wave color temperature is K 0 ±Δk. For example: positive white LED: 6250±250k.

[0040] Such as figure 2 As shown, for the LED array chip fixed on the substrate, first, cover the light-transmitting mirror and evenly spray silica gel on the light-transmitting mirror with a thickness of 500 microns, and then evenly spray phosphor powder with a thickness of 50 microns on the light-transmitting mirror.

[0041] ① Detection: After spraying, power on the LED chips fixed on the substrate; use the movable probe of the fiber-optic color temperature or wavelength detection equipment to detect the light wave color temperature of each LED chip through the light-transmitting mirror and phosphor powder, and Record the test results in the control softwa...

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Abstract

The invention discloses a method and a device for improving the color temperature consistency of a white light LED (Light Emitting Diode) lighting device. The method comprises the following steps: step 1, firstly covering a light transmitting lens on an LED chip fixed on a substrate and spraying a layer of silica gel on the light transmitting lens, wherein the thickness of the silica gel is 10-1000 micron, and the LED chip is a blue light chip; step 2, spraying and fixing a layer of yellow fluorescent powder on the silica gel; step 3, supplying power to the LED chip so that the LED chip emits light, and detecting the color temperature of the light which transmits through the transmitting lens, the silica gel and the fluorescent powder by using a probe of color temperature detecting equipment; and if a preset light wave length range or a color temperature range is achieved, stopping the fluorescent powder spraying process and carrying out a next step, or else turning back to the step 2. By adoption of the method and the device for improving the color temperature consistency of the white light LED lighting device, the color temperature of the LED lighting device can be regulated on line, and the precision is high.

Description

technical field [0001] The invention relates to a method and a device for improving the color temperature consistency of a white LED lighting device. Background technique [0002] In order to make LEDs produce white light that can be used for lighting, the traditional method is to spot silica gel containing yellow phosphor powder on the blue light chip. After curing, the blue light excites the yellow phosphor powder and mixes colors to produce white light. However, this method is difficult to control the absolute consistency of the amount of glue dispensed and the amount of phosphor powder, and can only dispense glue one by one. Therefore, the consistency and speed are poor, which seriously restricts the development of LED lighting. [0003] In order to improve efficiency, Chinese patents CN101295755A, 101521257A, 101533882A, 101101946A, 200910026812.2 propose to mix colloid and phosphor together to prepare a large-area phosphor film and then cut it into small pieces as requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/48H01L33/50H01L25/075
CPCH01L2224/48091H01L2924/16195H01L2924/00014
Inventor 王福亮邓圭玲李涵雄
Owner CENT SOUTH UNIV
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