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

Method for preparing green-light and transparent ceramic phosphor applied to high-photosynthetic-efficiency LED

A technology of transparent ceramics and phosphors, which is applied in the field of preparation of green light transparent ceramic phosphors, can solve problems such as poor thermal stability, achieve the effects of maintaining uniformity, high control precision, and broadening the application field

Inactive Publication Date: 2015-09-09
苏州工业园区晶冠瓷材料科技有限公司
View PDF5 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a prominent problem in this type of LED package: poor thermal stability
At present, green light ceramic phosphors in ceramic materials have not been reported

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
  • Method for preparing green-light and transparent ceramic phosphor applied to high-photosynthetic-efficiency LED
  • Method for preparing green-light and transparent ceramic phosphor applied to high-photosynthetic-efficiency LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Press (Ce 0.1％ Lu 99.9％ ) 3 al 5 o 12 Chemical composition weighing α-Al 2o 3 Powder, Lu 2 o 3 Powder, CeO 2 The powder raw material is 25g in total, add 0.1200g of TEOS, 1.1000g of fish oil into a high-purity agate ball mill jar, add 80g of high-purity alumina balls, 5g of absolute ethanol, 10g of xylene, and ball mill for 20h; then add poly Vinyl butyral 1.7g, fatty acid 1.7g, ball milled for 20h; after ball milling, pour it into a defoaming machine to defoam for 20min, and then cast it through a casting machine to obtain a cast layer of 600 microns; prepare ten layers (see figure 1 , where N=10) (Ce 0.1％ Lu 99.9％ ) 3 al 5 o 12 The cast layers are stacked to form a ceramic cast sheet, put into a dry press mold at 110°C for 10 hours, pressurize in one direction with a pressure axis of 20Mpa to form a non-layered integral ceramic block, and cold isostatically press at 200Mpa; cast The green body is degreased in an oxygen atmosphere at a heating rate of 1.5...

Embodiment 2

[0046] Press (Ce 0.5％ Lu 99.5％ ) 3 al 5 o 12 Chemical composition weighing α-Al 2 o 3 Powder, Lu 2 o 3 Powder, CeO 2 The powder raw material is 25g in total, the balls are 75g of zirconia balls, 8g of ethanol, 8g of xylene, 0.2500g of sintering aid MgO, 1.5g of dispersant oleic acid, the two ball milling times are 24h and 12h respectively; the dry pressure is 25MPa, The cast body was degreased in an oxygen atmosphere, the heating rate was 2°C / min, the temperature was raised to 800°C and kept for 30 hours, and the sintering time was 15 hours. Other conditions were the same as in Example 1, and a green transparent ceramic phosphor was obtained. The visible light transmittance 80.2%, quantum efficiency: 97.5%.

[0047] The green light transparent ceramic phosphor prepared in this embodiment is driven by a constant current of 20mA, and the performance indicators obtained by the 460nm blue light chip excitation test are as follows (see figure 2 ):

[0048] Light effect:...

Embodiment 3

[0053] Press (Ce 1％ Lu 99％ ) 3 al 5 o 12 Chemical composition weighing α-Al 2 o 3 Powder, Lu 2 o 3 Powder, CeO 2 A total of 25g of powder raw materials, 75g of alumina balls, alumina cans, 10g of ethanol, 6g of xylene, 0.1200g of TEOS and 0.0500g of MgO are used as sintering aids. The two ball milling times are 24h and 8h respectively; The conditions were the same as in Example 1, and a green light transparent ceramic phosphor was obtained, the visible light transmittance was 78.9%, and the quantum efficiency was 96.9%.

[0054] The green light transparent ceramic phosphor prepared in this example is driven by a constant current of 20mA, and the performance index obtained by the excitation test of a 460nm blue light chip is as follows:

[0055] Light effect: 157lm / W

[0056] Color coordinates: (0.3891, 0.5639)

[0057] Emission peak: 543nm.

[0058] It can be seen that the white light LED described in the present invention has high luminous efficiency, which is suf...

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
thicknessaaaaaaaaaa
quantum efficiencyaaaaaaaaaa
quantum efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of LED transparent luminescent ceramics and discloses a method for preparing a green-light and transparent ceramic phosphor applied to a high-photosynthetic-efficiency LED. The transparent ceramic phosphor is prepared through the tape-casting and vacuum-sintering process and the chemical composition of the transparent ceramic phosphor is as follows: (x% of Ce, 100%-x% of Lu) 3Al5Ol2, wherein x is larger than or equal to 0.05, and smaller than or equal to 1. The prepared green-light and transparent ceramic phosphor is simple in structure and simplified in packaging process. When the green-light and transparent ceramic phosphor is applied to a white-light LED, the effects of high photosynthetic efficiency, high quantum efficiency and excellent temperature quenching property are realized.

Description

technical field [0001] The invention relates to the field of LED transparent fluorescent ceramics, in particular to a method for preparing a green light transparent ceramic fluorescent body for high-light-efficiency LEDs. Background technique [0002] White light LED has many advantages such as small solidification, instant start and fast response (μs), energy saving, long life, green and high efficiency, etc. It is widely used and is expected to develop into a fourth-generation new lighting source. At present, the most widely used and most mature white light LED technology is GaN-based blue light chip plus yellow phosphor (cerium-doped yttrium aluminum garnet, Ce: Y 3 al 5 o 12 ) technology to form white light. However, there is a prominent problem in this kind of LED packaging: poor thermal stability. [0003] Using transparent fluorescent ceramics instead of "phosphor powder + silica gel" can effectively solve the above problems. Fluorescent transparent ceramics have...

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): C04B35/10C04B35/622
Inventor 胡宁宁何其昌
Owner 苏州工业园区晶冠瓷材料科技有限公司
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