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High color rendering white light LED with high S/P value, and an acquisition method and application thereof

A high color rendering and index technology, applied in electrical components, circuits, semiconductor devices, etc., can solve the problems of low mesoscopic light efficiency and high color temperature, and achieve high color rendering S/P value and high S/P value. Effect

Inactive Publication Date: 2017-11-21
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent application is used to solve the problems of high color temperature and low mesopic light efficiency of the existing white light LED light source for outdoor lighting, but the data recorded in Table 1 shows that the obtained white light LED has a photopic light effect of LE p Higher, but the Ra value is 61 and the S / P value is 1.52

Method used

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  • High color rendering white light LED with high S/P value, and an acquisition method and application thereof
  • High color rendering white light LED with high S/P value, and an acquisition method and application thereof
  • High color rendering white light LED with high S/P value, and an acquisition method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A white light LED with high color rendering index and high S / P value is obtained as follows:

[0038] Fix the blue light chip at the center of the bottom of the reflective cup with a height of 2mm, mix the red phosphor, green phosphor, S28A glue, and S28B glue in a certain proportion, and dispense the glue in a mold with an upper and lower curvature of 0.33 and a thickness of 1mm Form a phosphor layer, wherein the side of the mold can be attached to the inner wall of the reflective cup at a distance of 1mm from the chip, then place the formed phosphor layer in the reflective cup, vacuumize, and add a hemispherical collimating lens to obtain a high White LED with high color rendering index and S / P value.

[0039] In this embodiment, the peak value of the blue chip is at 450nm, and the green phosphor contained in the phosphor layer is a broadband green powder (Ba 0.98-x Sr x ) Si 3 o 4 N 2 :0.02Eu 2+ (x=0.1), the red phosphor contained is a broadband red powder CaAl...

Embodiment 2～3

[0047] The preparation process is the same as in Example 1, except that the molar ratios of the green phosphor to the red phosphor are 4.20 and 4.40, respectively.

Embodiment 4

[0049] The preparation process is the same as in Example 1, except that the value of x in the molecular formula of the green phosphor powder is 0.2.

[0050] The measured luminous performance data of the white LEDs prepared in the various examples and comparative examples are listed in Table 1 below.

[0051] Table 1

[0052]

[0053] By comparing the data in Table 1, it can be known that the white light LED obtained by the present invention satisfies the requirements of other light quality parameters for outdoor lighting, the color rendering index Ra in the four groups of embodiments is greater than 80, the CQS is greater than 90, and the S / P values ​​​​are greater than 1.90. However, in Comparative Example 1 in which the phosphor layer includes green phosphor and orange phosphor, the S / P value and color rendering index are lower than those of this embodiment. In addition, in Comparative Examples 2 and 3, which are doped with other green powder or red powder not in this ...

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Abstract

The invention discloses a high color rendering white light LED with a high S / P value, the LED comprises a blue light chip and a fluorescent powder layer used for coating the blue light chip, wherein the fluorescent powder layer comprises green fluorescent powder and read fluorescent powder. According to the high color rendering white light LED with the high S / P value provided by the invention, a color rendering value Ra is more than 80, the S / P value is more than 1.90, and other light quality parameters can also meet the performance requirement of the white light LED based on mesopic vision in existing outdoor illumination.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a white light LED with high color rendering index and high S / P value and its obtaining method and application. Background technique [0002] With the development of LED lighting technology, the application range of white light LED (WLED) has been extended from traditional indoor lighting to outdoor lighting, and the environment of outdoor lighting is at the level of intermediate visual brightness. Intermediate vision is a transitional state between the human eye's photopic vision and dark vision, with a brightness of 10 -3 cd / m 2 ~3cd / m 2 . Color Rendering Index (Color Rendering Index, Ra), Color Quality Index (Color Quality Scale, CQS) and the ratio of scotopic / photopic luminous flux to photopic luminous flux (scotopic / photopic ratio, S / P) are used to measure the light source of white LED in intermediate vision. An important optical evaluation parameter of qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/00H01L33/50H01L33/60
CPCH01L33/005H01L33/504H01L33/60
Inventor 王乐郑紫珊张宏李旸晖
Owner CHINA JILIANG UNIV
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