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Fluorescent powder used in high-color-rendering warm white LED (light-emitting diode)

A technology of warm white light and phosphor powder, applied in the field of phosphor powder, can solve the problems of poor color rendering, difficulty in white light LEDs lighting, and difficulty in meeting market requirements, so as to achieve the effect of enhancing color rendering and enhancing luminous efficiency.

Inactive Publication Date: 2014-07-02
XINCHANG GUANYANG TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current mainstream solution for white LEDs is the combination of InGaN blue LED chip and Ce 3+ activated rare earth garnet yellow phosphor. However, this solution achieves low color temperature (<4000K) and high color rendering white LEDs Illumination is more difficult because the emission spectrum of yellow phosphor lacks effective red light components
Products with a high color temperature above 5000K have poor color rendering, making it difficult to meet market requirements

Method used

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  • Fluorescent powder used in high-color-rendering warm white LED (light-emitting diode)

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Embodiment Construction

[0010] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0011] Concrete performance parameters of the present invention are described in the following table

[0012]

[0013] The color temperature is below 4700K, and the color rendering index is above 85, which meet the technical requirements of color rendering index Ra>80 and color temperature <5000K recommended by national standards.

[0014] Red Phosphor BaMoO Modified by Alkali Metal for Blue Excitation LED 4 :Pr 3+ , KCl (R1)

[0015] Al 3+ Modified Sr 3 m x Si 1-x o 5 : Ce 3+ , Eu 2+ (Y1) is composed of Sr 3-(x+y) m x Si 1-x o 5 : Ce x 3+ , Eu y 2...

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Abstract

The invention discloses fluorescent powder used in high-color-rendering warm white LED (light-emitting diode), and the fluorescent powder is prepared as follows: using a molybdate as a matrix, using an alkali metal to modify red ray fluorescent powder BaMoO4:Pr<3+>, KCl (R1) used in blue-ray excited LED; at the same time using fluoroaluminate and silicate as matrixes to invent two kinds of fluorescent powder used in violet-ray excited LED. The two kinds of fluorescent powder are as follows: Al <3+> modified Sr3MxSi1-xO5:Ce<3+>, Eu<2+> (Y1) and Ca<2+>, Mg<2+> and Si<4+> three-doped modified Sr2CaMgxAl1-2xSixO4F:Ce<3+> (Y2). The production process is simple and easy to operate, raw materials are cheap and easily obtained, and the equipment investment is low, so that the industrialized production is easy to realize. In addition, the production process basically does not produce "three wastes", basically belongs to the green, environmentally-friendly, low-energy-consumption and high-profit industry, and completely can achieve the double harvest of economic and social benefits.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to a fluorescent powder for a warm white LED with high color rendering property. Background technique [0002] There are many ways to use phosphors to achieve white light. The most mature and convenient way is to coat blue (450~480nm) LED chips or purple (395~430nm) LED chips with phosphors that emit yellow light. The current mainstream solution for white LEDs is InGaN blue LED chip and Ce 3+ Activated rare earth garnet yellow phosphor combination, however, it is difficult to achieve low color temperature (<4000K) and high color rendering white LEDs lighting in this scheme, because the emission spectrum of yellow phosphor lacks effective red light components. Products with a high color temperature above 5000K have poor color rendering and are difficult to meet market requirements. [0003] Patent No. 201010521569.4 relates to a phosphor powder for warm white LEDs, which is based on yt...

Claims

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Application Information

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IPC IPC(8): C09K11/68C09K11/64H01L33/50
CPCY02B20/181Y02B20/00
Inventor 不公告发明人
Owner XINCHANG GUANYANG TECH DEV