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

Fluorescent powder, preparation method thereof and light-emitting device comprising same

A technology of phosphors and elements, applied in the field of phosphors, light-emitting devices, and their preparation, can solve the problems of affecting device performance, low relative brightness, etc., and achieve the effects of improving luminous efficiency, low cost, and simple and easy preparation method

Active Publication Date: 2013-09-04
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG +1
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a new representative Sr 2 Si 5 N 8 Structured nitride phosphor, its matrix has a tight network structure and relatively low brightness, which affects the performance of the device during LED use

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
  • Fluorescent powder, preparation method thereof and light-emitting device comprising same
  • Fluorescent powder, preparation method thereof and light-emitting device comprising same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] Preferably, the above-mentioned preparation method includes the following steps: firstly, the nitrides of alkaline earth metals, Si and Eu are used as raw materials for primary mixing, and the primary mixture is heated at 1500-1800°C, preferably 1600-1700°C, under nitrogen and / or hydrogen atmosphere Medium roasting for 5-20h, preferably 15-20h, to obtain a roasted product; then use Si oxides and / or Al oxides as raw materials for secondary mixing with the roasted product, and heat the secondary mixture at 1500-1700°C, preferably Heat treatment at 1600°C in nitrogen and / or hydrogen atmosphere for 0.5-2h, preferably 1-2h, to obtain the required fluorescent powder; wherein the amount of the above-mentioned raw materials is calculated according to the weight percentage of each element in the fluorescent powder of the present invention Amount, where the amount of nitride of Si matches the amount of oxide of Si so that in the prepared phosphor particles, it is within the range ...

Embodiment 1

[0052] Preparation:

[0053] Weigh 41.67g Sr 3 N 2 , 61.39g Si 3 N 4 and 0.61g of EuN, mixed evenly, and roasted at 1700°C for 15 hours in a mixed atmosphere of nitrogen and hydrogen to obtain a roasted product, lower the temperature below 100°C, take it out, and crush it to obtain roasted particles with an average particle size of 10 μm; The calcined particles were mixed with 0.1 g of SiO 2 Mix, keep warm at 1600°C for 1 hour under a nitrogen atmosphere, lower the temperature below 100°C, take it out, crush it to obtain an average particle size of 10 μm, wash with water, dry and pass through a 450-mesh sieve to obtain the desired fluorescence powder, the mass ratios of Sr element, Si element, N element, O element and Eu element in the phosphor powder to the phosphor powder mass ratio are respectively: 37.7%, 36.8%, 25.1%, 0.1% and 0.4%.

[0054] X-ray diffraction: eg figure 1 As shown, the phosphor is Sr when tested by X-ray diffraction instrument 2 Si 5 N 8 structur...

Embodiment 2-11

[0058] The phosphor powder preparation process in Examples 2-11 is basically the same as in Example 1, except that the alkaline earth metal nitrides, Si 3 N 4 , the amount of EuN is different, and the added SiO 2 and Al 2 o 3 The amount is different, and the amount of each raw material added is shown in Table 1. Through X-ray diffraction, the fluorescent powders prepared in Examples 2-11 in Table 1 are all Sr 2 Si 5 N 8 structure, and detected by the EDS device, the mass ratio and m value of each element in the phosphor powder prepared in Example 2-11 are shown in Table 2.

[0059] The quality of the raw material that adds in the embodiment 2-11 of table 1

[0060] Example

Sr 3 N 2

Ca 3 N 2

Ba 3 N 2

Si 3 N 4

EuN

SiO 2

2

41.54

0

0

61.40

0.66

0.40

3

41.45

0

0

61.43

0.66

0.60

4

41.29

0

0

61.50

0.66

1.00

5

42.95

0

...

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
particle sizeaaaaaaaaaa
refractive indexaaaaaaaaaa
transmittivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses fluorescent powder, a preparation method thereof and a light-emitting device comprising same. The fluorescent powder has an Sr2Si5N8 structure and comprises 32-45% of alkaline earth, 25-38% of Si, 22-27% of N, 0.05-0.5% of O, 0-0.5% of Al and 0.2-13% of Eu by weight percentage, the ratio of the total weight percentage of Al and Si in any unit volume within the range of 0-50 nm extending to the particle center from the particle surface in fluorescent powder particles to the weight percentage of Si in any unit volume outside the range is m, and the value range of m is not less than 1.2 and not more than 2.5. The fluorescent powder provided by the invention is higher in light-emitting efficiency.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a fluorescent powder, a preparation method thereof and a luminescent device comprising the same. Background technique [0002] As a new type of solid-state light source, white LED has been widely used in the field of lighting and display due to its advantages of high light efficiency, low energy consumption, long life, and no pollution. At present, the realization method of white light LED is mainly based on a single blue light / ultraviolet chip composite phosphor, which is simple, easy to implement and relatively cheap. In the realization process of white LED, red fluorescent substance is indispensable as an important part of the three primary colors of red, green and blue. 3+ In addition to the lack of red in ", it can also produce white light with blue LEDs and green phosphors, or with green and blue fluorescent substances and purple or ultraviolet LEDs to produce white li...

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): C09K11/59H01L33/50
Inventor 刘荣辉刘元红徐会兵何华强高慰何涛陈观通夏天
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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