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

White-light LED (light-emitting diode) containing novel solid-state transparent fluorescent materials and preparation method thereof

A fluorescent material, transparent technology, used in white LED. Field, can solve problems such as yellow aperture, blue spot, phosphor efficiency decline, etc.

Active Publication Date: 2013-07-17
FUJIAN CAS CERAMIC OPTOELECTRONICS TECH CO LTD
View PDF5 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a temperature will cause the efficiency of the phosphor to drop by 20-30%, resulting in a shift in the color temperature and color coordinates of the light source
At the same time, it also affects the light efficiency and stability of the LED light source.
The yttrium aluminum garnet (YAG) phosphor will degrade at a temperature above 120 degrees Celsius. At the same time, because the coated phosphor material is a non-transparent material, scattering and absorption will occur when the light emitted by the blue light or ultraviolet chip passes through. The light extraction efficiency is not high; at the same time, due to the uneven coating thickness, it will seriously affect its light spot and white light color temperature
For example, problems such as yellow aperture, blue light spot, and inconsistent color temperature of white light caused by uneven coating

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
  • White-light LED (light-emitting diode) containing novel solid-state transparent fluorescent materials and preparation method thereof
  • White-light LED (light-emitting diode) containing novel solid-state transparent fluorescent materials and preparation method thereof
  • White-light LED (light-emitting diode) containing novel solid-state transparent fluorescent materials and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Press (Ce 0.06% Y 99.94% ) 3 Al 5 o 12 Chemical composition weighing α-Al 2 o 3 Powder, Y 2 o 3 Powder, Ce 2 o 3 Powder raw materials, add 0.1200g of TEOS and 0.5400g of polyvinyl butyral into the high-purity agate ball milling tank for the mixed powder, add 80g of high-purity agate balls, 12g of absolute ethanol, and put it into the ball mill after 20 hours Dry in oven for 15h. Grind with a mortar and sieve the powder to obtain a powder with a thickness of 45-75 μm, pressurize in one direction with a pressure axis of 10Mpa respectively, press into the original sheet, and then cold isostatically press at 200Mpa. Debinding at 900°C for 20 hours under normal pressure, and sintering the green body after debinding in vacuum, the heating rate is 10°C / min, the sintering temperature is 1850°C, the heating rate is 10°C / min, and the sintering time is 15 hours, the sintered sample was annealed at 1500° C. for 10 hours, and finally the sample was polished, and the thick...

Embodiment 2

[0113] Weigh the following powder materials according to the mole percentage in Table 1:

[0114] Table 1

[0115] raw material

NaF

MgO

Ce 2 o 3

Y 2 o 3

al 2 o 3

SiO 2

Composition (mol%)

5%

2%

2%

20%

35%

36%

[0116] The raw materials are mixed evenly by ball milling and then poured into a platinum crucible to melt. The melting temperature is 1650°C. After 2 hours of heat preservation, the glass melt is poured into a cast iron mold, and then placed in a high-temperature furnace for annealing. The annealing temperature is 750°C. After 2 hours, it was cooled to room temperature with the furnace to obtain a transparent glass phosphor with a thickness of 0.8 mm.

[0117] Such as Figure 4 As shown, the LED chip 20 with a peak wavelength of 460 nm is fixed on the crystal-bonding position of the alumina ceramic substrate 12 by using commercially available silica gel 50, and the silica gel 50 is cu...

Embodiment 3

[0119] Press (Ce 0.06% Gd 10% Y 89.94% ) 3 Al 5 o 12 Chemical composition weighing α-Al 2 o 3 Powder, Y 2 o 3 Powder, Gd 2 o 3 with Ce 2 o 3 Powder raw material, add 0.1200g of TEOS and 0.5400g of polyvinyl butyral to the mixed powder into a high-purity agate ball mill jar, add 80g of high-purity agate balls, 12g of absolute ethanol, and put it into the ball mill after 20 hours Dry in oven for 15h. Grind with a mortar and sieve the powder to obtain a powder with a thickness of 45-75 μm, pressurize in one direction with a pressure axis of 10Mpa respectively, press into the original sheet, and then cold isostatically press at 200Mpa. Debinding at 1500°C for 20 minutes under normal pressure, and sintering the green body after debinding in vacuum, the heating rate is 10°C / min, the sintering temperature is 1200°C, and the sintering time is 20h. The sintered sample was annealed at 1500° C. for 1 hour, and finally the sample was polished. The thickness of the polished s...

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
Color temperatureaaaaaaaaaa
Thicknessaaaaaaaaaa
Color temperatureaaaaaaaaaa
Login to View More

Abstract

The invention provides a transparent fluorescent body, and particularly relates to a transparent ceramic fluorescent body, a transparent glass fluorescent body and a transparent composite fluorescent body, and a white-light LED (light-emitting diode) applying the three transparent fluorescent bodies. According to the technical scheme provided by the invention, fluorescent powder in the traditional white-light LED light source is replaced by the transparent fluorescent materials, so as to realize white-light LED; and because the transparent fluorescent bodies have the advantages of being high in thermal conductance, high in stability and high in crystallinity, avoiding the colour temperature drift of the white-light LED light source caused by a high temperature, improving the stability of the white-light LED light source and improving the lighting effect of the white-light LED light source.

Description

technical field [0001] The invention provides a transparent fluorescent material, especially a transparent ceramic fluorescent body, a transparent glass fluorescent body, a transparent composite fluorescent body, and a white LED using the three transparent fluorescent materials. Background technique [0002] Light Emitting Diode (LED) can directly convert electrical energy into light energy. LED chip is made up of two parts, and a part is P-type semiconductor, and inside it occupies an leading position in hole, and the other end is N-type semiconductor, mainly electron. When these two kinds of semiconductors couple together, between them, just form a "P-N junction". When electric current acts on this chip by wire time, electron will be pushed to P district, and in P district, electron is with hole recombination, then will send energy with the form of photon, the principle of LED luminescence that Here it is. [0003] As a new type of light source, LED has achieved unpreced...

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): C09K11/80C09K11/86H01L33/50B32B17/06B32B18/00
CPCY02B20/181H01L2224/14H01L2224/16225H01L2224/48091H01L2924/16195Y02B20/00H01L2924/00014
Inventor 曹永革刘著光邓种华郭旺李军庭陈剑陈东川兰海
Owner FUJIAN CAS CERAMIC OPTOELECTRONICS TECH CO LTD
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