Single-host white-light emitting fluorophosphate fluorescent powder for white-light LED and preparation method of fluorophosphate fluorescent powder

A fluorophosphate, single-matrix technology, applied in the field of rare earth luminescent materials, can solve the problem of lack of single-matrix white light phosphors, and achieve the effects of good chemical stability and thermal stability, low sintering temperature, and cheap raw materials

Inactive Publication Date: 2015-06-24
HANGZHOU DIANZI UNIV
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, high-efficiency and stable single-matrix white light phosphors are currently lacking.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Single-host white-light emitting fluorophosphate fluorescent powder for white-light LED and preparation method of fluorophosphate fluorescent powder
  • Single-host white-light emitting fluorophosphate fluorescent powder for white-light LED and preparation method of fluorophosphate fluorescent powder
  • Single-host white-light emitting fluorophosphate fluorescent powder for white-light LED and preparation method of fluorophosphate fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the chemical formula Ba 2.999 GdNa(PO 4 ) 3 F: 0.001Eu 2+ Weigh the raw material BaCO 3 , NH 4 h 2 PO 4 、Gd 2 o 3 , NaF and Eu 2 o 3 , the molar ratio between them corresponds to 2.999:3:0.5:1:0.0005. After the raw materials are fully ground and mixed evenly, they are placed in a corundum crucible, and then placed in a high-temperature furnace and roasted at 1250°C for 7 hours under a CO atmosphere. , and then cooled to room temperature to obtain a fluorophosphate single-matrix white light phosphor.

[0024] From figure 1 It can be seen from the figure that the excitation spectrum of the phosphor powder in this embodiment is a broad spectrum, covering the ultraviolet, purple and blue light regions, the excitation peak is located near 400nm, and the spectral peak is high, indicating that the phosphor powder of this embodiment can be effectively excited by the purple light chip . When the excitation wavelength of the emission spectrum is 400nm, f...

Embodiment 2

[0026] According to Ba 2.995 GdNa(PO 4 ) 3 F: 0.005Eu 2+ Weigh BaCO 3 , NH 4 h 2 PO 4 、Gd 2 o 3 , NaF and Eu 2 o 3 The molar ratio between them is 2.995:3:0.5:1:0.0025. After fully grinding and mixing, place it in a corundum crucible, then put it into a high-temperature furnace and bake it at 1280°C for 5 hours in a CO atmosphere, and then cool it to room temperature. , to obtain fluorophosphate single-matrix white light phosphor.

[0027] The excitation spectrum of the phosphor in this embodiment is a broad spectrum, covering the ultraviolet, violet and blue light regions, the excitation peak is located near 400nm, and the spectral peak is high, indicating that the phosphor in this embodiment can be effectively excited by the violet chip. When the excitation wavelength of the emission spectrum is 400nm, the emission of the phosphor powder in this embodiment is the broadband emission of divalent europium, and there are two emission peaks, which are respectively loca...

Embodiment 3

[0029] According to Ba 2.99 GdNa(PO 4 ) 3 F: 0.01Eu 2+ Weigh BaCO 3 , NH 4 h 2 PO 4 、Gd 2 o 3 , NaF and Eu 2 o 3 , the molar ratio between them is 2.99:3:0.5:1:0.005. After fully grinding and mixing evenly, place it in a corundum crucible, then put it into a high-temperature furnace and bake it at 1300°C for 4 hours under a nitrogen-hydrogen mixture atmosphere. Cool to room temperature to obtain fluorophosphate single-matrix white light phosphor.

[0030] The excitation spectrum of the phosphor in this embodiment is a broad spectrum, covering the ultraviolet, violet and blue light regions, the excitation peak is located near 400nm, and the spectral peak is high, indicating that the phosphor in this embodiment can be effectively excited by the violet chip. When the excitation wavelength of the emission spectrum is 400nm, the emission of the phosphor powder in this embodiment is the broadband emission of divalent europium, and there are two emission peaks, which are r...

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 discloses a single-host white-light emitting fluorophosphate fluorescent powder for a white-light LED and a preparation method of the fluorophosphate fluorescent powder. A chemical formula of the fluorescent powder is Ba3GdNa(PO4)3F:xEu<2+>, wherein x is 0.001-0.10; the preparation method comprises the following steps: weighing corresponding raw materials, namely barium carbonate, ammonium dihydrogen phosphate, gadolinium oxide, sodium fluoride and europium oxide according to the stoichiometric ratio of the chemical formula; grinding the raw materials evenly to obtain a mixture; sintering the mixture in a high-temperature furnace in a reducing atmosphere at 1250-1350 DEG C, and cooling to a room temperature to obtain the single-host white-light emitting fluorophosphate fluorescent powder. The obtained fluorescent powder can emit white light under excitation of an ultraviolet chip and purple light chip; two emission peaks exist and are respectively located at 470nm and 650nm; the fluorescent powder is good in dispersibility, uniform in granularity, good in chemical stability and high in luminous efficiency; an excitation band covers an ultraviolet region, a purple light region and a blue light region, and can be used as the single-host white-light emitting fluorescent powder for an ultraviolet LED and a purple light LED.

Description

technical field [0001] The invention relates to the technical field of rare earth luminescent materials, in particular to a single-matrix white light-emitting fluorophosphate phosphor powder for white LEDs and a preparation method thereof. Background technique [0002] White light LED is a solid-state semiconductor device that converts electrical energy into white light. It has many advantages such as high efficiency, small size, long life, safety, low voltage, energy saving, and environmental protection. The fourth-generation lighting source after the discharge lamp will be the mainstream product in the lighting market in the future. In the "National Medium and Long-Term Science and Technology Development Plan (2006-2020)", China clearly regards high-efficiency, energy-saving, and long-life semiconductor lighting products as a priority support area. [0003] At present, there are various white light LED preparation methods, including the combination of blue LED chips and y...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86
CPCY02B20/00
Inventor 余华季振国陈大钦陈雷锋钟家松赵红挺
Owner HANGZHOU DIANZI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap