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 the phosphor powder of the LED chip, high consistency, and the inability to meet the luminous color temperature of the 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: 2015-07-15
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

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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: Embodiment of a phosphor coating method for improving the color temperature consistency of a single-chip LED lighting device

[0031] like 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 of various color temperatures, in order to obtain devices with a specific range of color temperature, such as: 6250±250k However, this method has low yield and high cost. By using 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 chip fixed on the substrate, cover the light-transmitting mirror and spray silica gel on the light-transmitting mirror. The thickness is 500 microns by ...

Embodiment 2

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

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

[0040] like figure 2 As shown in the figure, 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 uniformly spray the light-transmitting mirror with phosphor powder with a thickness of 50 microns.

[0041] ①Detection: After spraying, power on the LED chips fixed on the substrate; use the optical fiber color temperature or the movable probe of the 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 t...

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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 light LED lighting device. Background technique [0002] In order to make LEDs generate white light that can be used for lighting, the traditional method is to dot silica gel containing yellow phosphors on the blue light chip. After curing, the blue light excites the yellow phosphors and mixes colors to generate 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 LED. 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 to prepare a large-area phosphor film, then cut into small pieces as needed, and install ...

Claims

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Application Information

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