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Red phosphor for LED and preparation method of red phosphor

A red phosphor, calcining technology, applied in the field of red phosphor, can solve the problem of poor emission efficiency of red phosphor

Active Publication Date: 2016-07-27
JINING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because red phosphors have poor emission efficiency, it is necessary to develop red phosphors that exhibit high emission efficiency when excited by an ultraviolet excitation light source as soon as possible.

Method used

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  • Red phosphor for LED and preparation method of red phosphor

Examples

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Effect test

Embodiment 1

[0021] A kind of red fluorescent powder for LED, chemical formula is M 2 EuVO 6 , where M is calcium ion Ca 2+ , strontium ion Sr 2+ and zinc ion Zn 2+ The combination of the three, the molar ratio of the three is 1:1:3;

[0022] The preparation method comprises the following steps:

[0023] (1) With calcium carbonate, strontium sulfate, zinc nitrate, ammonium metavanadate and Eu 2 o 3 as raw material, according to chemical formula M 2 EuVO 6 Molar ratio of the elements in Weigh the raw materials, grind and mix evenly; calcium ion Ca 2+ , strontium ion Sr 2+ and zinc ion Zn 2+ The molar ratio of the three is 1:1:3;

[0024] (2) Calcining the obtained mixture in an air atmosphere, the calcination temperature is 350°C, the calcination time is 8 hours, and this step is repeated 3 times;

[0025] (3) Cool the calcined mixture naturally, grind and mix it uniformly, and calcinate in an atmosphere containing oxygen at a calcining temperature of 750° C. for 9 hours to obta...

Embodiment 2

[0027] A kind of red fluorescent powder for LED, chemical formula is M 2 EuVO 6 , where M is calcium ion Ca 2+ , strontium ion Sr 2+ and zinc ion Zn 2+ The combination of the three, the molar ratio of the three is 1:1:3;

[0028] The preparation method comprises the following steps:

[0029] (1) With calcium oxalate, strontium carbonate, zinc nitrate, vanadium pentoxide and Eu 2 o 3 as raw material, according to chemical formula M 2 EuVO 6 Molar ratio of the elements in Weigh the raw materials, grind and mix evenly; calcium ion Ca 2+ , strontium ion Sr 2+ and zinc ion Zn 2+ The molar ratio of the three is 1:1:3;

[0030] (2) Calcining the obtained mixture in an air atmosphere, the calcination temperature is 320°C, the calcination time is 7 hours, and this step is repeated 3 times;

[0031] (3) Cool the calcined mixture naturally, grind and mix evenly, and calcinate in an atmosphere containing oxygen at a calcining temperature of 730° C. and a calcining time of 9 ho...

Embodiment 3

[0033] A kind of red fluorescent powder for LED, chemical formula is M 2 EuVO 6 , where M is calcium ion Ca 2+ , strontium ion Sr 2+ and zinc ion Zn 2+ The combination of the three, the molar ratio of the three is 1:1:3;

[0034] The preparation method comprises the following steps:

[0035] (1) With calcium sulfate, strontium oxalate, zinc carbonate, vanadium pentoxide and Eu 2 o 3 as raw material, according to chemical formula M 2 EuVO 6 Molar ratio of the elements in Weigh the raw materials, grind and mix evenly; calcium ion Ca 2+ , strontium ion Sr 2+ and zinc ion Zn 2+ The molar ratio of the three is 1:1:3;

[0036] (2) Calcining the obtained mixture in an air atmosphere, the calcination temperature is 300°C, the calcination time is 7.5 hours, and this step is repeated 3 times;

[0037] (3) Cool the calcined mixture naturally, grind and mix evenly, and calcinate in an atmosphere containing oxygen at a calcining temperature of 700° C. for 9 hours to obtain a re...

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Abstract

The invention relates to a red phosphor for an LED and a preparation method of the red phosphor.The chemical formula of the red phosphor is M2EuVO6, wherein M refers to a combination of calcium ions Ca2+, strontium ions Sr2+ and zinc ions Zn2+, and the molar ratio of the calcium ions to the strontium ions to the zinc ions is 1:1:3.The red phosphor emits red fluorescence with the center wave length being 615 nm under the stimulation of ultraviolet light to blue light with the wave length of 250 nm to 490 nm.The preparation process is simple, cost is low, the thermal treatment process is simple and easy to control, and the method is suitable for large-scale industrial production.The prepared red phosphor has the advantages of being small and even in grain size, high in red light emitting brightness, high in emitting efficiency, pure in color and good in thermal stability, and can be widely used in a white LED illuminating system, a plasma display panel, red LED systems or other colorful LED systems.

Description

technical field [0001] The invention relates to a red fluorescent powder (phosphor), in particular to a red fluorescent powder with high emission efficiency and a preparation method thereof. Background technique [0002] Light Emitting Diode (Light Emitting Diode) is an energy conversion device that can convert electrical energy into light energy. It has low operating voltage, low power consumption, stable performance, long life, strong impact resistance, vibration resistance, light weight and small size. , low cost, fast luminous response and other advantages. Therefore, it is widely used in display devices and short-distance, low-speed optical fiber communication light sources. Especially in recent years, the rapid development of blue, purple and ultraviolet LEDs has made it possible for LEDs to replace incandescent and fluorescent lamps in the lighting field. [0003] White LEDs can be made with red, green and blue LEDs. In this case, white LEDs require high manufacturi...

Claims

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Application Information

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IPC IPC(8): C09K11/69H01L33/50
CPCC09K11/7736H01L33/502
Inventor 张功国司崇殿刘国栋王宇光
Owner JINING UNIV
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