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

Luminescent material with core-shell structure and preparation method thereof

A technology of luminescent materials and core-shell structure, which is applied in the direction of luminescent materials, chemical instruments and methods, can solve the problems of rare earth ion excitation peak line width narrow, low optical absorption cross section, etc., to achieve excellent light conversion performance, high luminous efficiency, luminous high efficiency effect

Active Publication Date: 2015-05-20
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the optical absorption cross section of rare earth ions is relatively low, and the discrete energy level structure determines the narrow line width of the excitation peak of rare earth ions, resulting in only a small part of the solar spectrum that can be converted.

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
  • Luminescent material with core-shell structure and preparation method thereof
  • Luminescent material with core-shell structure and preparation method thereof
  • Luminescent material with core-shell structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The invention also discloses a method for preparing a luminescent material with a core-shell structure, comprising the following steps:

[0030] (A) Combining rare earth luminescent materials with semiconductor Cd 1-x Zn x After S is mixed, it is hot-pressed and sintered to obtain an intermediate; 0≤X<1;

[0031] (B) heat-treating the intermediate under the protection of an inert gas and annealing to obtain a luminescent material with a core-shell structure.

[0032] The present invention uses rare-earth luminescent materials and semiconductor materials as raw materials, and the rare-earth luminescent materials use rare-earth ions as luminescent centers, and the rare-earth ions are preferably trivalent lanthanides (Ln 3+ )ion. The rare earth luminescent material is preferably (Y 0.91 Tb 0.01 Yb 0.08 ) 2 o 3 , (Y 0.89 Tb 0.01 Yb 0.08 Li 0.02 ) 2 o 3 , (Y 0.91 Tb 0.01 Yb 0.06 Li 0.02 ) 2 o 3 , (Y 0.89 T m 0.01 Yb 0.08 Li 0.02 ) 2 o 3 , YLiF 4 : ...

Embodiment 1

[0039] Incorporate high-purity rare earth oxides including Y 2 o 3 ,Yb 2 o 3 ,Tb 4 o 7 Heat treatment at 800 degrees Celsius for 3 hours, weigh the rare earth oxide and lithium carbonate, etc., according to the molar ratio of the target phosphor components, and dissolve them in dilute nitric acid, adjust the pH value of the solution to make it between 2-4, heat and stir until The solution is clear and transparent. Then add citric acid (the ratio of the amount of citric acid to the metal ion is 1:1), and finally add polyethylene glycol, and stir to obtain a sol precursor solution. The precursor solution was transferred to an evaporating dish, dried at a constant temperature of 80 degrees Celsius for 10 hours, and dried. The obtained xerogel was pretreated on a heating plate at 200 °C to make it undergo self-propagating combustion. Grind, transfer to a corundum crucible, sinter respectively at 500 degrees Celsius for 4 hours, and then sinter at 1000 degrees Celsius for 6 ...

Embodiment 2

[0044] The molar ratio is 20mol% (Y 0.89 Tb 0.01 Yb 0.08 Li 0.02 ) 2 o 3 with 80mol% Cd 0.8 Zn 0.2 S is fully ground and sieved under the protection of argon to achieve the purpose of uniform mixing and fine powder.

[0045] Select a mold with an inner diameter of 20mm to determine the amount of powder required.

[0046] Pad graphite paper in the mold; weigh 0.48g (Y 0.89 Tb 0.01 Yb 0.08 Li 0.02 ) 2 o 3 , 1.08gCd 0.8 Zn 0.2 S mixed powder into the mold cavity, so that the powder is evenly distributed in the mold cavity; put into the pressure head. Place the mold on the tablet press for pre-compression. Put the mold and pads into the hot-press sintering cavity in sequence. Move the lower ram upward to compress the graphite pad and mold. Adjust the temperature measuring device, and close the hot-press sintering chamber door. Vacuum to keep the air pressure in the cavity below 1Pa. Pressurize the mould, and the pressure is 90MPa. Start the program, start to h...

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

PropertyMeasurementUnit
band gapaaaaaaaaaa
Login to View More

Abstract

The invention provides a luminescent material with a core-shell structure. A rare earth luminescent material is taken as a core, and a semiconductor Cd1-xZnxS is taken as a shell; the rare earth luminescent material takes rare earth ions as a luminescent center; and the range of Zn component in the Cd1-xZnxS is as follows: x is not less than 0 and less than 1. The semiconductor material has strong absorption against photons which are higher than a band gap, a quasi-continuous energy band structure allows a semiconductor to have a very high absorption coefficient in a very wide spectral range, and electrons excited by the high-energy photons can effectively relax to the bottom of a conduction band for downward transition luminescence. Therefore, the prepared luminescent material with the core-shell structure has the advantages of excellent light conversion performance and high luminescence efficiency. The luminescent material provided by the invention adopts a full-solid reaction method combining hot pressure sintering and high-temperature annealing, any solvent is not added in the whole process, the introduction of compound inclusions containing C-H and C-O bonds is avoided, and the relatively high luminescence efficiency is further ensured.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a luminescent material with a core-shell structure and a preparation method thereof. Background technique [0002] A solar cell is a device that directly converts light energy into electrical energy through the photoelectric effect or photochemical effect. Currently, monocrystalline silicon solar cells dominate the solar power generation market. The spectrum range of effective response of silicon photodiode is 400-1100nm, while the spectrum range of ground sunlight is 280-2500nm. Due to the mismatch of spectrum, the light conversion efficiency of existing solar cells is relatively low. In order to improve the utilization efficiency of sunlight, researchers have gradually discovered solar cells using rare earth luminescent materials as light conversion layers. Rare earth luminescent materials can be divided into up-conversion materials and down-conversion materials. Through ...

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): C09K11/78C09K11/85C09K11/02
Inventor 孟健武晓杰
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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