A high-performance europium, dysprosium co-doped strontium aluminate long-lasting phosphor and preparation method thereof

A phosphor and aluminum acid technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of low luminous intensity, short afterglow time, and insufficient afterglow time, and achieve afterglow performance improvement, afterglow time extension, The effect of increasing the luminous intensity

Active Publication Date: 2021-04-13
RENMIN UNIVERSITY OF CHINA
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the luminous intensity of strontium aluminate long afterglow phosphor on the market is not high, and the afterglow time is not long enough.
[0003] At present, the most classic method for the preparation of long-lasting phosphors is the high-temperature solid-state method, using a single boric acid as a flux, but the long-lasting phosphors prepared by this method have low luminous intensity and short afterglow time. With the deepening of research, long afterglow phosphors have been developed into more application fields such as biomarkers because of their unique properties.

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
  • A high-performance europium, dysprosium co-doped strontium aluminate long-lasting phosphor and preparation method thereof
  • A high-performance europium, dysprosium co-doped strontium aluminate long-lasting phosphor and preparation method thereof
  • A high-performance europium, dysprosium co-doped strontium aluminate long-lasting phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1. Preparation of high-performance europium and dysprosium co-doped strontium aluminate long-lasting phosphor

[0026] 1) The chemical formula of the europium and dysprosium co-doped strontium aluminate long-lasting phosphor is SrAl 2 o 4 :Eu 2+ , Dy 3+ , weigh the following raw materials in strict accordance with the stoichiometric ratio: SrCO 3 (4.1632g), Al 2 o 3 (3.0588g), Eu 2 o 3 (0.1056g) and Dy 2 o 3 (0.2238g), take by weighing flux 1wt%H simultaneously 3 BO 3 (0.0755g), 1wt% BaF 2 (0.0755g);

[0027] 2) Mix the raw materials weighed in step 1) and place them in a ball mill for ball milling. The speed of the ball mill is 232 rpm, 324 rpm, and milled for 6 hours.

[0028] 3) Transfer the slurry from the ball mill jar to a glass dish with a disposable dropper to obtain a blank; dry the blank at 80°C for 4 hours, and then pour 5% H into the tube furnace 2 and 95%N 2 Mixed weakly reducing gas, sintered at 1300°C for 4h;

[0029] 4) Grinding t...

Embodiment 2

[0030] Example 2. Preparation of high-performance europium and dysprosium co-doped strontium aluminate long-lasting phosphor

[0031] The preparation method is basically the same as in Example 1, the difference is that the flux H in step 1) 3 BO 3 The amount of addition is modified to 0.5wt% (0.0377g), BaF 2 The addition amount of the modified to 1.5wt% (0.1133g).

Embodiment 3

[0032] Example 3. Preparation of high-performance europium and dysprosium co-doped strontium aluminate long-lasting phosphor

[0033] The preparation method is basically the same as in Example 1, the difference is that the flux H in step 1) 3 BO 3 The amount of addition is modified to 1.5wt% (0.1133g), BaF 2 The addition amount of is modified to 0.5wt% (0.0377g).

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 method for preparing high-performance europium and dysprosium co-doped strontium aluminate long-lasting phosphor. The method comprises the following steps: 1) taking the following raw materials according to the stoichiometric ratio: SrCO 3 、Al 2 o 3 、Eu 2 o 3 and Dy 2 o 3 , and weigh the flux H at the same time 3 BO 3 、BaF 2 ; 2) Grinding the raw materials weighed in step 1) and the flux to obtain a slurry; 3) suctioning the slurry; 4) drying the blank, and then sintering in a weak reducing atmosphere to obtain the europium , Dysprosium co-doped strontium aluminate long afterglow phosphor. In this method, a certain concentration of boric acid/barium fluoride is added as a combined flux when the phosphor powder is sintered by the high-temperature solid-state method, so that the luminous intensity of the sample powder sintered at a certain temperature is greatly improved, and the afterglow time is also extended. The afterglow performance of the phosphor is improved.

Description

technical field [0001] The invention relates to a high-performance europium-dysprosium co-doped strontium aluminate long-lasting phosphor and a preparation method thereof. Background technique [0002] Strontium aluminate long-lasting phosphor doped with europium and dysprosium is a chemically stable yellow-green long-lasting luminescent material, which is widely used in indication, machinery, art and other aspects. At present, the luminous intensity of strontium aluminate long afterglow phosphors on the market is not high, and the afterglow time is not long enough. [0003] At present, the most classic method for the preparation of long-lasting phosphors is the high-temperature solid-state method, using a single boric acid as a flux, but the long-lasting phosphors prepared by this method have low luminous intensity and short afterglow time. With the deepening of research, long afterglow phosphors have been developed into more application fields such as biomarkers because o...

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 Patents(China)
IPC IPC(8): C09K11/64
CPCC09K11/7792
Inventor 曹永革汪玉珍龙嘉奇
Owner RENMIN UNIVERSITY OF CHINA
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