Unlock instant, AI-driven research and patent intelligence for your innovation.

Single-phase white light fluorescent powder based on near-UV excitation and preparation method thereof

A technology of near-ultraviolet light and fluorescent powder, which is applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of lumen efficiency and color reproduction performance, and achieve good stability, high luminous intensity, and excellent preparation process. simple effect

Inactive Publication Date: 2011-04-27
湖南信多利新材料有限公司
View PDF1 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if multi-phase phosphors are used to achieve white light, there will be problems of color reabsorption and ratio control between the phosphor mixtures, and the lumen efficiency and color reproduction performance will be greatly affected.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The present invention will be described in detail below

[0015] (4) The molecular formula of single-phase white light phosphor excited by near ultraviolet light is: LiCa 3 wxya 3 o 12 :Eu 3+ . Weigh Li 2 CO 3 30-40g, CaCO 3 275-290g, SrCO 3 25-35g, NH 4 VO 3 340-360g, MgO35-45g, Eu 2 o 3 8-16g add 0.2-0.5% flux BaF 2 or H 3 BO 3 ; The weight ratio of each raw material is: Li 2 CO 3 4-7%, CaCO 3 32-40%, SrCO 3 2-6%, NH 4 VO 3 40-50%, MgO 4-7%, Eu 2 o 3 1-5%; get the mixture and mix evenly; burn at 700-1000°C for 2-4 hours, take it out and cool it down to room temperature to get a semi-finished product, test the relative brightness, emission main peak, particle size and other indicators, get the semi-finished product and test the relative brightness, emission For the main peak, particle size and other indicators, the semi-finished product is crushed, washed with a coarse sieve, wet sieved, centrifuged, dried through a 100-mesh sieve, and the compreh...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of luminescent materials, and discloses single-phase white light fluorescent powder based on near-UV excitation. The molecular formula of the single-phase white light fluorescent powder is LiCa3SrMgV3O12:Eu<3+>. In the preparation method of the fluorescent powder, the following materials are weighed by weight: 30-40g of Li2CO3, 275-290g of CaCO3, 25-35g of SrCO3, 340-360g of NH4VO3, 35-45g of MgO, and 8-16g of Eu2O3, wherein the weight percentages of the materials are as follow: 4-7% of Li2CO3, 32-40% of CaCO3, 2-6% of SrCO3, 40-50% of NH4VO3, 4-7% of MgO and 1-5% of Eu2O3, and the preferable weight ratio of Li2CO3 to CaCO3 to SrCO3 to NH4VO3 to MgO to Eu2O3 is 0.05:0.38:0.04:0.47:0.04:0.015; and 0.2-0.5% of a fluxing agent BaF2 or H3BO3 is added; and the preparation method is a high temperature solid-phase method. The single-phase white light fluorescent powder can be efficiently excited by near UV of 365nm to respectively present two emission spectrums of 530nm and 610nm so that efficient white light is emitted. Therefore, the fluorescent powder has the advantages of good stability and high luminous intensity.

Description

technical field [0001] The invention belongs to the field of luminescent materials, in particular to a single-phase white light phosphor excited by near ultraviolet light and a preparation method thereof. Background technique [0002] There are currently two main technologies for producing white light LEDs. One is to use ultra-high brightness In-GaN blue LEDs, and add a little yttrium aluminum garnet (YAG) phosphor as the main body to the die. The In-GaN chip emits blue light, and the YAG phosphor emits yellow light after being excited by the blue light. The blue light emitted by the chip and the yellow light of the fluorescent powder are mixed together to form white light; the second is the principle of three primary colors and the red, green, and blue ultra-high-brightness LEDs that have been produced so far are mixed according to the ratio of light intensity 1:2:0.38 into white. [0003] The first type of white light is a mixture of yellow fluorescence of luminescent po...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K11/69
CPCY02B20/181Y02B20/00
Inventor 蒋葵明刘清玲曾维亮刘光辉
Owner 湖南信多利新材料有限公司