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Near ultraviolet or blue light excited tungstate red fluorescent powder and preparation method thereof

A technology of red phosphor and blue light excitation, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of lack of red light components, large amount of tungsten element, and poor matching in white light LED lighting systems, and achieve low cost, Low equipment requirements and good matching effect

Inactive Publication Date: 2012-07-04
HARBIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the lack of red light components in the existing white LED lighting system that uses GaN-based blue light-emitting diodes with YAG:Ce phosphors to achieve white light emission, and the matching between the excitation wavelength of the red phosphors used in high-pressure mercury lamps and near-ultraviolet chips. Not good, existing Eu 3+ The amount of tungsten element doped with tungstate fluorescent materials is large, the high-temperature solid-phase method for preparing tungstate fluorescent materials has high energy consumption, and the chemical methods such as sol-gel and hydrothermal synthesis have complex processes and long preparation cycles. Tungstate red phosphor excited by ultraviolet or blue light and preparation method thereof

Method used

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  • Near ultraviolet or blue light excited tungstate red fluorescent powder and preparation method thereof
  • Near ultraviolet or blue light excited tungstate red fluorescent powder and preparation method thereof
  • Near ultraviolet or blue light excited tungstate red fluorescent powder and preparation method thereof

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specific Embodiment approach 1

[0009] Specific embodiment one: the chemical structural formula of the tungstate red fluorescent powder excited by the near ultraviolet or blue light of the present embodiment is (M 1-x Eu x ) 10 W 2 o 21 , where M is Gd, La or Y, 0.05≤x≤0.2.

[0010] The tungstate red fluorescent powder excited by near ultraviolet or blue light of the present embodiment, Eu 3+ For activator ions, when the value of x is less than 0.05, the brightness of the phosphor is too low, and when the value of x is greater than 0.2, obvious concentration quenching occurs. The tungstate red phosphor powder excited by near ultraviolet or blue light in this embodiment is Eu 3+ The doped tungstate phosphor powder can obtain red emission with the main peak at around 610nm under the excitation of near-ultraviolet light (395nm) and blue light (465nm). White LEDs use red phosphors. Y with a weight percentage of 6% of Eu 2 o 2 S: Compared with Eu commercial fluorescent powder, the luminous intensity of t...

specific Embodiment approach 2

[0011] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the chemical structural formula (M 1-x Eu x ) 10 W 2 o 21 0.08≤x≤0.18 in . Others are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the chemical structural formula (M 1-x Eu x ) 10 W 2 o 21 where x=0.12. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses near ultraviolet or blue light excited tungstate red fluorescent powder and a preparation method thereof, relates to a fluorescent powder material for emitting red light and a preparation method thereof, and solves the problems that the existing YAG: Ce fluorescent powder lacks a red light component, the excitation wavelength of red fluorescent powder for a high-voltage mercury lamp is not well matched with a near ultraviolet chip, an Eu3+ doped tungstate fluorescent material has large using amount of tungsten element, a high-temperature solid phase method has high energy consumption and chemical methods of sol-gel and hydrothermal synthesis and the like have complex process and long preparation period. The chemical structural formula of the near ultraviolet or blue light excited tungstate red fluorescent powder is (M1-xEux)10W2O21, wherein M is Gd, La or Y. The method comprises the following steps: preparing M, Eu and sodium tungstate solution respectively, mixing the solution to obtain sediment, and sintering the sediment to obtain the fluorescent powder. The near ultraviolet or blue light excited red fluorescent powder has good matching property with a light-emitting diode and little using amount of W; and the preparation method is simple and is used for a white light LED.

Description

technical field [0001] The invention relates to a fluorescent powder material emitting red light and a preparation method thereof. Background technique [0002] White LED is a new solid-state lighting electric light source (SSL), and its principle and structure are different from previous vacuum electric light sources such as incandescent lamps and fluorescent lamps. SSL light sources have many advantages, especially high luminous efficiency, energy saving, long service life, and no pollution. They have great application value and prospects. . What is common in the market now is to use GaN-based blue light-emitting diodes with YAG:Ce phosphors that emit yellow light to achieve white light emission. Since this white light lighting system uses blue light and yellow light to mix to produce white light effects, Lack of red light components, so its color rendering index is not good; although the white light LED (UV-LED) of the near-ultraviolet light-emitting chip can realize wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
Inventor 孟庆裕冯晓辉孙立男
Owner HARBIN NORMAL UNIVERSITY