Unlock instant, AI-driven research and patent intelligence for your innovation.

Ultraviolet-excited Eu single-doped single-phase white-light-emitting phosphor powder and preparation method thereof

A phosphor, single-phase technology, applied in luminescent materials, chemical instruments and methods, electrical components, etc., can solve the problems of limited use range, poor reduction effect of C powder, easy to contaminate phosphors, etc., to improve the overall quantum efficiency. , Wide effective reaction range, optimized spectral performance

Active Publication Date: 2019-10-25
SHANGHAI INST OF TECH
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to achieve white light emission, this patented technology needs to be combined with YAG:Ce 3+ The mixture is excited with a 450nm blue chip, and the Ca 10 K(PO 4 ) 7 :Eu 3+ Phosphor is a narrow-band excitation that cannot match the 450nm blue light chip
[0004] At present, the phosphor reduction methods are mainly hydrogen reduction and C powder reduction. The phosphors prepared by the above two methods are yellow or green phosphors. Among them, hydrogen reduction has certain safety hazards, and C powder reduction effect is poor, and it is easy to contaminate the phosphor. Powder, and the required reduction temperature of the two is relatively high, and the scope of use is limited

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
  • Ultraviolet-excited Eu single-doped single-phase white-light-emitting phosphor powder and preparation method thereof
  • Ultraviolet-excited Eu single-doped single-phase white-light-emitting phosphor powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0035] A method for preparing an ultraviolet-excited Eu single-doped single-phase white light-emitting phosphor, the process parameters in the preparation process are shown in Table 1, specifically comprising the following steps:

[0036] (1) Weigh CaCO according to the stoichiometric ratio 3 , K 2 CO 3 , NH 4 h 2 PO 4 , Eu 2 o 3 Raw material powder 3g (the mass ratio of each raw material is CaCO 3 :K 2 CO 3 :NH 4 h 2 PO 4 :Eu 2 o 3 =1.5945:0.1104:1.2866:0.0084), placed in an agate mortar, ground for 30 minutes, then placed in an alumina crucible, pre-fired in a muffle furnace at 600°C for 3 hours, cooled to room temperature and ground evenly, and then placed Burn at 1200°C for 8h in a muffle furnace to prepare the precursor.

[0037] (2) Weigh 0.3g of Al powder and 1g of sample according to the mass ratio of Al powder to precursor of 0.3:1, place them in two crucible boats respectively, and place the crucible boats in parallel in a vacuum tube furnace, and put ...

Embodiment example 2

[0043] A method for preparing an ultraviolet-excited Eu single-doped single-phase white light-emitting phosphor, the process parameters in the preparation process are shown in Table 1, specifically comprising the following steps:

[0044] (1) Take a portion of CaCO according to the stoichiometric ratio 3 , K 2 CO 3 , NH 4 h 2 PO 4 , Eu 2 o 3 Raw material powder 3g (the mass ratio of each raw material is CaCO 3 :K 2 CO 3 :NH 4 h 2 PO 4 :Eu 2 o 3 =1.5900:0.1103:1.2856:0.014), placed in an agate mortar, ground for 30 minutes, then placed in an alumina crucible, pre-fired in a muffle furnace at 600°C for 3 hours, cooled to room temperature and ground evenly, and then placed Burn at 1200°C for 8h in a muffle furnace to prepare the precursor.

[0045] (2) Weigh 0.3g of Al powder and 1g of sample according to the mass ratio of Al powder to precursor of 0.3:1, place them in two crucible boats respectively, and place the crucible boats in parallel in a vacuum tube furnac...

Embodiment example 3

[0054] A method for preparing an ultraviolet-excited Eu single-doped single-phase white light-emitting phosphor, the process parameters in the preparation process are shown in Table 1, specifically comprising the following steps:

[0055] (1) Take a portion of CaCO according to the stoichiometric ratio 3 , K 2 CO 3 , NH4H 2 PO 4 , Eu 2 o 3 Raw material powder 3g (the mass ratio of each raw material is CaCO 3 :K 2 CO 3 :NH 4 h 2 PO 4 :Eu 2 o 3 =1.5900:0.1103:1.2856:0.014), placed in an agate mortar, ground for 30 minutes, put into an alumina crucible, pre-fired in a muffle furnace at 700°C for 2.5 hours, cooled to room temperature and ground evenly, and then Put it in a muffle furnace and burn it at 1000°C for 12h to prepare the precursor.

[0056] (2) Weigh 0.3 g of Al powder and 1 g of sample according to the mass ratio of Al powder to precursor of 0.3:1, place them in two crucible boats respectively, and place the crucible boats in parallel in a vacuum tube fur...

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 ultraviolet-excited Eu single-doped single-phase white-light-emitting phosphor powder and a preparation method thereof. The preparation method comprises the following steps that CaCO3, Eu2O3, K2CO3 and (NH4)H2PO4 raw material powder is weighed and taken , grinding is carried out to uniformly mix the raw material powder, a obtained mixture is placed in a crucible, pre-firedat 500-700 DEG C for 2.5-3.5h, a pre-fired sample is cooled and uniformly ground; and the obtained sample is sintered at 1000-1200 DEG C for 8-12h to obtain a precursor; and metal powder and the precursor are weighed and taken and separately placed in two crucible boats, the crucible boats are placed in a vacuum tube furnace, and the mixture is vacuumed and subjected to reductive sintering at thetemperature less than 1000 DEG C for 2-8 hours. Compared with the prior art, visible light having a spectral range capable of covering 410-750 nm can be emitted under the excitation of ultraviolet light, and the ultraviolet-excited Eu single-doped single-phase white-light-emitting phosphor powder has the advantages of high overall quantum efficiency of the phosphor powder and simple preparation method.

Description

technical field [0001] The invention relates to the technical field of phosphor preparation, in particular to an ultraviolet-excited Eu single-doped single-phase white light-emitting phosphor and a preparation method thereof. Background technique [0002] White light LED has become a green lighting source in the 21st century because of its significant advantages such as low power consumption, high efficiency, green environmental protection, energy saving, long life, small size, fast response, and good color rendering, with good market prospects and huge social and economic benefits. It has aroused widespread concern in the industry. Phosphor conversion materials currently used in white LEDs can be divided into mixed phosphor systems and single-matrix phosphor systems. The phosphor powder of the mixed system is to mix the phosphor powders emitted by different colors together, and realize white light emission through the color matching of various phosphor powders. However, t...

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): C09K11/71H01L33/50
CPCC09K11/7738H01L33/502Y02B20/00
Inventor 房永征曹艳蓉侯京山刘静慧刘玉峰
Owner SHANGHAI INST OF TECH