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A white LED light source with continuously adjustable color temperature

A technology of LED light source and color temperature, which is applied in the field of white LED light source, can solve the problems such as the inability to achieve a single color temperature light-emitting surface, the inability to achieve focused ideal mixed light, etc., and achieve the effect of good color temperature uniformity

Active Publication Date: 2020-06-12
北京宇极芯光光电技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method effectively reduces the distance between the cool white / warm white light-emitting surfaces and achieves a better color mixing effect. However, in essence, it still uses two different colors of light-emitting surfaces to mix and adjust light, and cannot achieve an ideal single-color temperature light-emitting surface.
Especially in applications such as spotlights, when the lens is used to condense light, the light spot is separated into two color temperature colors, which cannot achieve ideal light mixing when focusing

Method used

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  • A white LED light source with continuously adjustable color temperature
  • A white LED light source with continuously adjustable color temperature
  • A white LED light source with continuously adjustable color temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] figure 1 Schematic diagram of the structure of the SMD sample used for the implementation of the present invention, wherein the dispensing area c is the light-emitting area, and the electrodes are divided into two channels. The purple light chip and the blue light chip each use a channel, that is, the blue light channel a and the purple light channel b. Implement the device packaging process as follows:

[0035] 1. Die-bonding: use ordinary crystal-bonding glue to fix the blue / purple LED chips in the glue dispensing area c of the bracket. In this embodiment, the peak wavelength of the light emission of the blue light chip is at 450nm, and the peak wavelength of the light emission of the purple light chip is at 405nm.

[0036] 2. Welding wire: Connect the positive and negative poles of the two LED chips to the positive and negative poles of the bracket respectively through gold wires to form two channels of blue light channel a and purple light channel b.

[0037] 3. Gl...

Embodiment 2

[0047] Figure 4 Schematic diagram of the sample structure of the LED module used for the implementation of the present invention, wherein the dispensing area c, the electrodes are divided into two channels, and the blue light chip and the purple light chip each use a channel, that is, the blue light channel a and the purple light channel b. In the implementation of the device packaging process, the blue light chip and the purple light chip are arranged crosswise in the glue dispensing area c, which is the light emitting area, and the blue light / purple light are respectively used as two channel bonding wires according to the circuit design. The glue dispensing and curing process is the same as the previous embodiment. One is the same.

[0048] Packaged LED device luminescence spectrum such as Figure 5 As shown, including: 1. The spectrum when only the blue light channel is turned on, and the color temperature is 7000K; 2. The spectrum when only the purple light channel is tu...

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Abstract

The invention provides a white-light LED light source with continuously adjustable color temperature. A purple-light chip having a wavelength of 380 nm to 420 nm and a blue-light chip having a wavelength of 440 nm to 480 nm are configured to form two channels respectively in a device. By virtue of the characteristics that a Lu3Al5O12:Eu green fluorescent powder A and a K2SiF6:Mn red fluorescent powder A can be excited by the blue light and are less likely to be excited by the purple light, and in cooperation with a CaAlSi(ON)3:Eu red fluorescent powder B and a SiAlON:Eu green fluorescent powder B which can be simultaneously excited by a blue-purple-light chip, and a (Sr,Ba)10(PO4)6Cl2:Eu blue fluorescent powder B which can be excited by the purple light and is less likely to be excited bythe blue light, the continuously adjustable color temperature is achieved on one light-emitting surface, the good color temperature uniformity is acheived, and no spot is generated. The white-light LED light source can realize full-spectrum white light and can be applied to all LED light source packaging forms including a patch LED device or an LED module.

Description

technical field [0001] The invention relates to the technical field of LEDs, in particular to a white LED light source with continuously adjustable color temperature realized by utilizing the blue light / purple light excitation selectivity of fluorescent powder. Background technique [0002] With the development of LED industry technology and the improvement of functions, the function of light color adjustment has become one of the common functions of LED lamps. Among them, the light color adjustable function of white LED is mainly the continuous change of color temperature. At present, the method of color temperature change mainly adopts dual channels to separately control the cool white light and warm white light integrated in the lamp, and continuously changes the white light by mixing colors through the change of the relative intensity of cool and warm white. The LED light source of this type of lamp can be roughly divided into two categories: [0003] 1. Separate type:...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/48H01L33/50H01L33/54
CPCH01L33/483H01L33/504H01L33/54H01L2933/005
Inventor 黎力鲁路吴振雄张微刘晓东
Owner 北京宇极芯光光电技术有限公司
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