Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A blue-green silicate ultra-long afterglow luminescent material and its preparation method

A technology of long afterglow luminescence and luminescent materials, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., to achieve the effect of low cost and energy saving

Inactive Publication Date: 2020-05-08
LANZHOU UNIVERSITY
View PDF10 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The longest afterglow time of all the long afterglow materials disclosed above is about 14h, but the above silicate long afterglow materials need to be prepared at a higher temperature and with the addition of a co-solvent

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 blue-green silicate ultra-long afterglow luminescent material and its preparation method
  • A blue-green silicate ultra-long afterglow luminescent material and its preparation method
  • A blue-green silicate ultra-long afterglow luminescent material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Press Ba 0.9975 Si 2 o 5 :Eu 0.0025 , Pr 0.01 The stoichiometric ratio shown in the molecular formula, respectively weigh 0.3946gBaCO 3 , 0.2403g SiO 2 , 0.00088g Eu 2 o 3 and 0.0016g Pr 2 o 3 , grind the weighed raw materials to micron-sized powder, mix them uniformly and put them into an alumina crucible, and then place them in an environment with a temperature of 1100°C and a reducing atmosphere for 6 hours. The reducing atmosphere consists of 95% by volume N 2 and 5% H 2 The composition is naturally cooled to room temperature after calcination, and after grinding, a blue-green silicate ultra-long afterglow luminescent material is obtained. The pyrolysis spectrum of the blue-green silicate ultra-long afterglow luminescent material, such as figure 1 As shown in the figure, the thermal release peak of the luminescent material is at 89°C, which indicates that in the matrix used, through the doping of activator ions and co-activator ions, a more suitable dept...

Embodiment 2

[0041] Press Ba 0.9975 Si 2 o 5 :Eu 0.0025 , Nd 0.01 The stoichiometric ratio shown in the molecular formula, respectively weigh 0.3946gBaCO 3 , 0.2403g SiO 2 , 0.00088g Eu 2 o 3 and 0.0016g Nd 2 o 3 , Grind the weighed raw materials to the micron level, mix them evenly and put them into an alumina crucible, then place them at a temperature of 1300 ° C, and pass them into a reducing atmosphere for 4 hours. The reducing atmosphere consists of 95% by volume N 2 and 5% H 2 composition. After the calcination is completed, it is naturally cooled to room temperature, and after grinding, a blue-green silicate ultra-long afterglow luminescent material is obtained. The afterglow spectrum of the long afterglow luminescent material after being irradiated under the ultraviolet light source for 10 minutes is as follows: Figure 4 As shown, it can be seen from the figure that the long-lasting luminescent material can continuously emit a luminous brightness of 0.32mcd / m2 that ca...

Embodiment 3

[0043] Press Ba 0.9975 Si 2 o 5 :Eu 0.0025 , Ho 0.01 The stoichiometric ratio shown in the molecular formula, respectively weigh 0.3946gBaCO 3 , 0.2403g SiO 2 , 0.00088g Eu 2 o 3 and 0.0017g Ho 2 o 3 , grind the weighed raw materials to the micron level, mix them uniformly and put them into an alumina crucible, then place them at a temperature of 1200°C and pass them into a reducing atmosphere for calcination for 5 hours. The reducing atmosphere consists of 95% by volume N 2 and 5% H 2 composition. After the calcination is completed, it is naturally cooled to room temperature, and after grinding, a blue-green silicate ultra-long afterglow luminescent material is obtained. The afterglow spectrum of the long afterglow luminescent material after being irradiated under the ultraviolet light source for 10 minutes is as follows: Figure 5 As shown, it can be seen from the figure that the luminescent material can continuously emit more than 20 hours of luminous brightnes...

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 relates to a blue-green silicate long afterglow luminescent material and a preparation method thereof. The chemical expression of the luminescent material is Ba0.9975Si2O5:Eu0.0025, Rx,wherein R is one or two of Dy, Pr, Ce, Nd, Tm, Sm, Yb, Gd, Er, Tb or Ho, and x is more than or equal to 0.005 and less than or equal to 0.050. The preparation method comprises the steps of respectively weighing raw materials according to a stoichiometric ratio, grinding the weighed raw materials, and evenly mixing to obtain raw material powder; carrying out calcination, cooling, and then grindingto obtain the ultra-long blue-green silicate long afterglow luminescent material. According to the preparation method, Eu<2+> is used as activation ions, one or two of trivalent rare earth ions such as Dy<3+> and Nd<3+> are used as co-activation ions, a co-solvent is not added, and calcinations is carried out at low temperature; the luminescent material prepared by the method can emit blue-green ultra-long afterglow after being excited by light with a wavelength of 200-400 nm. The blue-green silicate long afterglow luminescent material has the advantages of being simple, free from pollution, energy-saving and low in cost.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and relates to a luminescent material, in particular to a blue-green silicate ultra-long afterglow luminescent material, and also relates to a preparation method of the luminescent material. Background technique [0002] Long-lasting luminescent material is a kind of photoluminescent material, which generates light under the excitation of an external light source, absorbs light energy and stores it at the same time, and then slowly releases the stored energy in the form of light after the excitation stops. The duration of afterglow is called afterglow time, the afterglow less than 1μs is called ultra-short afterglow, the one between 1 and 10μs is called short afterglow, the one between 10μs and 1ms is called medium and short afterglow, and the one between 1 and 100ms is called medium afterglow. Those between 100ms and 1s are called long afterglow, and those longer than 1s are called...

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): C09K11/59
CPCC09K11/7792
Inventor 王育华冯鹏
Owner LANZHOU UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com