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Light emitting diode (LED) phosphor with white light excited under dual modes of ultraviolet light and red light and preparation method

A dual-mode, fluorescent powder technology, applied in chemical instruments and methods, the use of gas discharge lamps, luminescent materials, etc., can solve the problems of weak color rendering index of red light, only down-conversion luminous characteristics, etc., and achieve strong luminous intensity , high color rendering index, the effect of high color rendering index

Inactive Publication Date: 2013-01-02
UNIV OF ELECTRONIC SCI & TECH OF CHINA +1
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Problems solved by technology

Although the single-matrix phosphor M reported in the literature 2 V 2 o 7 (M=Ba, Sr or Ca), its preparation method is simple; but due to the relatively weak red light part, the color rendering index is low, and only the traditional down-conversion luminescence characteristics

Method used

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  • Light emitting diode (LED) phosphor with white light excited under dual modes of ultraviolet light and red light and preparation method
  • Light emitting diode (LED) phosphor with white light excited under dual modes of ultraviolet light and red light and preparation method
  • Light emitting diode (LED) phosphor with white light excited under dual modes of ultraviolet light and red light and preparation method

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Embodiment Construction

[0027] A method for preparing fluorescent powder for LEDs that excites white light in dual modes of ultraviolet and red light, comprising the following steps:

[0028] Step 1: Weigh the corresponding mass of SrCO 3 powder, NH 4 VO 3 Powder and Na 2 CO 3 Powder, wherein the molar ratio between Sr, V and Na is x:(2-x):2, and x=0, 0.05, 0.10, 0.15, 0.20 and 0.25.

[0029] Step 2: Mix the 6 kinds of proportioning raw materials obtained in step 1 respectively to obtain 6 kinds of proportioning mixtures; when mixing, the raw materials weighed in step 1 can be put into an agate container and mixed by grinding; For specific grinding, put the raw material weighed in step 1 into the agate container for 0.5 to 2 hours of grinding, then take out the primary grinding material and pre-fire it at 400-500°C for 1-2 hours, and finally put the pre-fired material The sub-grinding is 0.5 to 2 hours to obtain a homogeneously mixed mixture.

[0030]Step 3: Put the 6 kinds of mixed materials o...

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Abstract

The invention provides an LED phosphor with white light excited under dual modes of ultraviolet light and red light and a preparation method, and belongs to the technical filed of function materials. The phosphor is a Sr2V2O7 powder material doped with sodium ions and in a triclinic crystal orientation structure, and the molecular formula is NaxSr2-xV2O7, wherein 0<x<=0.25. SrCO3, NH4VO3 and Na2CO3 are taken as raw materials to prepare the phosphor through a solid phase reaction method. The phosphor is provided with strong excitation (absorption) spectrum under 320nm-370nm of ultraviolet light and 625nm-725nm of red light, and can obtain 400nm-650nm of white light with high relative strength under excitation of the ultraviolet light and the red light, and therefore the color rendering index for a white LED is effectively improved. The phosphor has the advantages of being good in stability, simple in preparation method, easy to industrialize and good in repeatability; and a possibility for wide popularization of the white LED is provided.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a single-matrix fluorescent powder for light-emitting diodes (LEDs) and a preparation method thereof. Background technique [0002] The dual-mode excited luminescent material has both down-conversion and up-conversion luminescent properties. Materials for LEDs with ultraviolet excitation of white light belong to down-conversion luminescent materials. There are two combinations of phosphors for LEDs with ultraviolet excitation white light: one is ultraviolet LED chips + red, green and blue phosphors, and the other is ultraviolet LED chips + single matrix phosphors. In the former case, the white light obtained is unstable due to the difference in light decay and driving current of each phosphor. The latter can completely overcome the above shortcomings, and the cost is relatively low. Therefore, single-matrix phosphors for LEDs with ultraviolet excitation of white lig...

Claims

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Application Information

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IPC IPC(8): C09K11/69H01L33/50
CPCY02B20/181Y02B20/00
Inventor 杨维清林媛白阳赵江涛许晓东
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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