Supercharge Your Innovation With Domain-Expert AI Agents!

Phosphor in polycrystalline ceramic structure and a light-emitting element comprising same

A technology of polycrystalline ceramics and light-emitting elements, which is applied in the field of phosphors and can solve problems such as high cost, back scattering, and low thermal conductivity

Active Publication Date: 2008-03-12
LUMILEDS HLDG BV
View PDF8 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these fine pores and heterogeneous crystals also cause backscattering
The disadvantage of using YAG:Ce as the basic material is its low thermal conductivity and the high cost of the material and its manufacturing process

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
  • Phosphor in polycrystalline ceramic structure and a light-emitting element comprising same
  • Phosphor in polycrystalline ceramic structure and a light-emitting element comprising same
  • Phosphor in polycrystalline ceramic structure and a light-emitting element comprising same

Examples

Experimental program
Comparison scheme
Effect test

example

[0054] By deagglomeration of alumina particles (for example by wet ball milling (wet ball milling) or ultrasound, etc.) and stabilization (for example by using HNO 3 or polyacrylic acid), a powder consisting of fine and well-dispersible alumina particles (e.g. Taimei TM-DAR, Sumitomo AKP50) is mixed with a YAG:Ce type powder dispersed in water (e.g. Philios Lighting) . The alumina suspension is cast (for example by slip casting or gel casting) into the mold.

[0055] After drying and removal from the mold, the porous alumina product is calcined in oxygen at a temperature substantially below the sintering temperature to remove all unwanted components such as stabilizers and binders. Next, the material is sintered in a suitable sintering atmosphere (such as vacuum or oxygen atmosphere) until the density is higher than 95%. Hot isostatic pressing is performed after the sintering process to further increase the density without requiring higher sintering temperatures. The result...

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 phosphor in a polycrystalline ceramic structure and a light-emitting element provided with the same comprising a Light-Emitting Diode (LED) in which a composite structure of phosphor particles is embedded in a matrix, characterized in that the matrix is a ceramic composite structure comprising a polycrystalline ceramic alumina material, hereafter called luminescent ceramic matrix composite. This luminescent ceramic matrix composite can be made by the steps of converting a powder mixture of ceramic phosphor particles and alumina particles into a slurry, shaping the slurry into a compact, and applying a thermal treatment, optionally in combination with hot isostatic pressing into a polycrystalline phosphor-containing ceramic alumina composite structure. The luminescent ceramic matrix composite further allows a method of tuning the light-diffusing properties by changing at least one of the fractions of phosphor particles and second ceramic particles, the grain size of the particles of the ceramic composite structure, the difference in the refractive index of the particles of the ceramic composite structure, and the porosity in the polycrystalline phosphor-containing ceramic composite structure.

Description

technical field [0001] The present invention relates to a phosphor in a polycrystalline ceramic structure, a light-emitting element including a light-emitting diode provided with the phosphor, a method of manufacturing the phosphor, and a method of adjusting the light-diffusing and luminescent properties of the phosphor. [0002] The phosphors in this polycrystalline ceramic structure form a luminescent ceramic composite. Background technique [0003] The case of state-of-the-art high-brightness white LEDs (Light Emitting Diodes) faces limitations. The phosphor layer deposited on the LED causes light loss by backscattering light into the LED. Backscatter loss is typically 20-30%. Also, heat transfer from the LED and phosphor is a problem for high power applications where the junction and phosphor temperatures get high and the optics (phosphor encapsulant and extraction lens) effectively insulate the LED . Commonly used packaging matrices are made of silicon and / or epoxy,...

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
IPC IPC(8): H05B33/20H01L33/00C09K11/80C04B35/44
Inventor J·德格拉夫T·A·科普
Owner LUMILEDS HLDG BV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com