Mn<4+> doped red fluorescent material and preparation method thereof

A technology for red fluorescence and raw materials, applied in the field of Mn4+-doped red fluorescent materials and their preparation, can solve the problems of low light emission color rendering index of white LEDs, harm to human health and environment, poor chemical stability, etc., and achieve enhanced photoluminescence. , low cost, good stability

Pending Publication Date: 2020-05-26
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems with this solution: the lack of visible red light spectrum leads to low color rendering index, high color temperature, poor color rendering and cold light characteristics of white LEDs.
mn 4+ Ion-activated fluoride red phosphors have excellent red luminescent properties,

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
  • Mn&lt;4+&gt; doped red fluorescent material and preparation method thereof
  • Mn&lt;4+&gt; doped red fluorescent material and preparation method thereof
  • Mn&lt;4+&gt; doped red fluorescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1: Preparation by high temperature solid phase method (Mg 1-y A y ) 2 (Ti 1-z B z ) 1-x O 4 :xMn 4+ (B=Zr; x=0.001, y=0, z=0.01), the raw materials used are analytical pure MgO, TiO 2 , ZrO 2 And MnO 2 ; Then accurately weigh the raw materials according to the molar ratio in the chemical reaction equation and add 5wt% NH 4 F flux, grind and mix evenly with an agate mortar to obtain a precursor; put the precursor into a 25×25mm alumina crucible, then place it in a muffle furnace, and heat up to 800°C in an air atmosphere for pre-sintering. Keep the temperature for 6 hours, take it out and re-grind to make it evenly mixed. After the second sintering, keep it at 1400°C for 10 hours in an air atmosphere. Place the obtained sample in an agate mortar and grind it to obtain Mg. 2 (Ti 0.99 Zr 0.01 ) 0.999 O 4 :0.1%Mn 4+ Phosphor. X-ray powder diffraction (XRD) analysis results show that the XRD pattern of the sample is g2 TiO 4 The standard powder diffraction file 25-1157 ...

Example Embodiment

[0033] Example 2: Preparation by high temperature solid phase method (Mg 1-y A y ) 2 (Ti 1-z B z ) 1-x O 4 :xMn 4+ (A=Ca, B=Zr; x=0.0015, y=0.01, z=0.01), the raw materials used are analytical pure MgO, CaCO 3 , TiO 2 , ZrO 2 And MnO 2 ; Then accurately weigh the raw materials according to the ratio of the chemical reaction equation and add 3wt% LiF flux, grind and mix uniformly with an agate mortar to obtain the precursor, put the precursor into a 25×25mm alumina crucible, and then place it in In the muffle furnace, pre-sintering is carried out in an air atmosphere to 600°C for 8 hours. After taking it out, it is ground again to make it evenly mixed. The secondary sintering is kept at 1200°C in an air atmosphere for 10 hours. The sample is ground in an agate mortar, and finally (Mg 0.99 Ca 0.01 ) 2 (Ti 0.99 Zr 0.01 ) 0.9985 O 4 : 0.15% Mn 4+ Phosphor. X-ray powder diffraction analysis results show that the XRD pattern of the sample is g2 TiO 4 The standard PDF#25-1157 card matc...

Example Embodiment

[0034] Example 3: Preparation by high temperature solid phase method (Mg 1-y A y ) 2 (Ti 1-z B z ) 1-x O 4 :xMn 4+ (A=Ca, B=Si; x=0.001, y=0.01, z=0.005), the raw materials used are analytical pure MgO, CaCO 3 , TiO 2 , SiO 2 And MnO 2 ; Then accurately weigh the raw materials according to the ratio of the chemical reaction equation and add 5wt% LiF flux, grind and mix uniformly with an agate mortar to obtain the precursor, and put the precursor into a 25×25mm alumina crucible, and then place it in In the muffle furnace, pre-sintering is carried out in an air atmosphere to 600°C for 8 hours. After taking it out, it is ground again to make it evenly mixed. The secondary sintering is held in an air atmosphere at 1150°C for 8 hours to obtain The sample is ground in an agate mortar, and finally (Mg 0.99 Ca 0.01 ) 2 (Ti 0.995 Si 0.005 ) 0.999 O 4 :0.1%Mn 4+ Phosphor. X-ray powder diffraction analysis results show that the obtained phosphor is a pure phase. Under the excitation of 28...

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 Mn<4+> doped red fluorescent material and a preparation method thereof. The general formula of the fluorescent material is (Mg1-yAy)2(Ti1-zBz)1-xO4: xMn<4+> (A = Ca, Sr, Ba;B=Zr, Si; 0.01 at% </= x </= 1.0 at%; 0 </= y </= 5 at%; 0 </= z </= 10 at%). The preparation method comprises the following steps OF: taking MgO, caCO3, SrCO3, BaCO3, TiO2, ZrO2, SiO2 and MnO2 as raw materials, weighing the raw materials according to the element molar ratio, after uniformly grinding in an agate mortar, carrying out high-temperature solid-phase reaction, adding a proper amount offluxing agent under the condition that a pure phase is guaranteed, and finally acquiring the Mn<4+> doped red fluorescent powder material ((Mg1-yAy)2(Ti1-zBz)1-xO4: xMn<4+>), the obtained Mn<4+> doped red fluorescent powder material having excellent red light-emitting performance. According to the prepared red fluorescent material, Mn<4+> is used as an activator, rare earth elements are not contained, raw materials and final products do not contain harmful substances such as fluorine, the preparation method is simple, and the production cost is low. The red fluorescent powder can emit red fluorescence with the wavelength range of 630-730 nm when excited by excitation light sources such as ultraviolet, near ultraviolet or blue light LEDs, and is suitable for being applied to the field of warm white light LED device illumination and display.

Description

technical field [0001] The invention belongs to the field of solid luminescent materials, in particular to a Mn material used in the field of warm white LED lighting and display. 4+ Doped red fluorescent material and preparation method thereof. Background technique [0002] Compared with traditional incandescent lamps and fluorescent lamps, the new generation of solid-state light sources - semiconductor white light-emitting diodes (white LEDs) have many advantages such as low power consumption, high efficiency, long life, small size, and environmental protection. They are widely used in lighting, display panels, Medical imaging, military and other fields. There are two main schemes for synthesizing white LEDs: blue-light chips compounded with yellow phosphors and near-ultraviolet chips compounded with trichromatic phosphors. Currently, commercial white LEDs are based on InGaN blue LED chips excited by YAG:Ce 3+ The white light obtained by the yellow phosphor powder is mai...

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): C09K11/67
CPCC09K11/673C09K11/676
Inventor 张彦袁军平徐家跃田甜储耀卿申慧罗宽宽黄礼武余枭
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap