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

Preparation method for small particle nitrogen oxide of green emitting phosphor

A green phosphor, nitrogen oxide technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of harsh synthesis conditions, reduce the luminous intensity of powder, and low purity of the crystal phase of the product, and achieve the goal of maintaining the integrity of the crystal. Effect

Inactive Publication Date: 2014-02-12
IRICO
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis conditions of the conventional method are relatively harsh, and the crystal phase purity of the obtained product is relatively low, resulting in a slightly lower brightness than other systems, and the powder synthesized by the high-temperature solid-phase method has relatively high hardness, which requires physical crushing in the later stage to be applicable For the production of LED lamps, as we all know, this kind of physical fragmentation will greatly destroy the crystal structure of the powder, thereby greatly reducing the luminous intensity of the powder

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
  • Preparation method for small particle nitrogen oxide of green emitting phosphor
  • Preparation method for small particle nitrogen oxide of green emitting phosphor
  • Preparation method for small particle nitrogen oxide of green emitting phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: Phosphor powder Sr 0.98 Si 2 o 2 N 2 : Preparation of 0.02Eu

[0028] 1) Prebody Sr 1.96 SiO 4 : Preparation of 0.04Eu

[0029] According to Sr 1.96 SiO 4 : 0.04Eu stoichiometric ratio, weighed SrCO 3 173.6g, SiO 2 36.05g, Eu 2 o 3 4.22g was mixed and fully ground to obtain the first mixture; 3% of its mass of flux NH was added to the first mixture 4 After mixing and fully grinding Cl, put it in an alumina crucible, put the crucible in a tube furnace, and in the protective gas NH 3 In the process, the gas flow rate is ≥30ml / min when the temperature is raised to 600°C-1000°C; the gas flow rate is ≤20ml / min when the temperature is raised to 1000-1250°C, and then sintered at 1250°C for 3 hours and then cooled to obtain the precursor Sr 1.96 SiO 4 :0.04Eu;

[0030] Synthetic precursor Sr 1.96 SiO 4 : 0.04Eu presents a lump, utilizes the agate mortar to carry out physical crushing after it, utilizes the sieve screen of 150 meshes to sieve, the ...

Embodiment 2

[0035] Example 2 Phosphor powder Sr 0.97 Si 2 o 2 N 2 : Preparation of 0.03Eu

[0036] 1) Prebody Sr 1.94 SiO 4 : Preparation of 0.06Eu

[0037] According to the precursor Sr 1.94 SiO 4 : 0.06Eu stoichiometric ratio, weighed SrCO 3 173.6g, SiO 2 36.42g, Eu 2 o 3 6.4g and 3wt% catalyst NH 4 Cl was mixed and fully ground and then placed in an alumina crucible, and the crucible was placed in a tube furnace under the protective gas N 2 / H 2 In the process, the gas flow rate is ≥30ml / min when the temperature is raised to 600°C-1000°C; the gas flow rate is ≤20ml / min when the temperature is raised to 1000-1300°C, and then sintered at 1300°C for 1 hour and then cooled to obtain the precursor Sr 1.94 SiO 4 :0.06Eu;

[0038] Prebody Sr 1.94 SiO 4 The steps of crushing and sieving of 0.06Eu are the same as in Example 1.

[0039] 2) Phosphor powder Sr 0.97 Si 2 o 2 N 2 : Preparation of 0.03Eu

[0040] According to Sr 0.97 Si 2 o 2 N 2 : The stoichiometric ratio...

Embodiment 3

[0044] Example 3 Phosphor powder Sr 0.96 Si 2 o 2 N 2 : Preparation of 0.04Eu

[0045] 1) Body Sr 1.92 SiO 4 : Preparation of 0.08Eu

[0046] According to the precursor Sr 1.92 SiO 4 : 0.08Eu stoichiometric ratio, weighed SrCO 3 173.6g, SiO 2 36.796g, Eu 2 o 3 8.621g and 1% catalyst NH 4 Cl 1% H 3 BO 3 , put in an alumina crucible after mixing and fully grinding, put the crucible in a tube furnace, in the protective gas N 2 / H 2 In the process, the gas flow rate is ≥30ml / min when the temperature is raised to 600°C-1000°C; the gas flow rate is ≤20ml / min when the temperature is raised to 1000-1300°C, and then sintered at 1100°C for 2 hours and then cooled to obtain the precursor Sr 1.92 SiO 4 :0.08Eu;

[0047] The crushing and sieving steps of the precursor are the same as in Example 1.

[0048] 2) Phosphor powder Sr 0.96 Si 2 o 2 N 2 : Preparation of 0.04Eu

[0049] According to Sr 0.96 Si 2 o 2 N 2 : The stoichiometric ratio of 0.04Eu, the Sr 1.92 ...

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
Login to View More

Abstract

The invention discloses a preparation method for small particle nitrogen oxide of green emitting phosphor, comprising the following steps of: firstly, synthesizing a precursor A(1-x)2BO4:2xRe of the nitrogen oxide of green emitting phosphor; and secondly, synthesizing the small particle nitrogen oxide of green emitting phosphor A1-xByOzN2 / 3+4 / 3y-2 / 3z:xRe, wherein the emission wavelength of the green emitting phosphor can be adjusted by adjusting the doping amount of Eu. The later physical crushing process is avoided. In addition, a relatively-mild ultrasound dispersion and water sedimentation method is adopted, thus the crystal completeness of powder particles can be maintained and the granularity of the powder meets the production requirement of an industrial LED (Light Emitting Diode) lamp.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder for LEDs, and relates to a preparation method of small particle nitrogen oxide green fluorescent powder. Background technique [0002] The white light-emitting device can excite three primary colors (red, green, and blue) phosphors by using a UV light-emitting diode (UV LED) as a light source, excite red and green phosphors by using a blue LED as a light source, or excite phosphors by using a blue LED as a light source. Yellow phosphor is used to produce white light, but the white LED produced by this mode has the defects of low color rendering and high color temperature due to the lack of red component, which greatly limits its application field. One of the schemes that can be used to obtain white LEDs with high color rendering index and different color temperatures is to add red / green phosphors to blue chips, so it is necessary to develop green phosphors with excellent performance. ...

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 Patents(China)
IPC IPC(8): C09K11/64C09K11/59
Inventor 赵莉
Owner IRICO