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Fluorescent material with molybdate and tungstate as matrixes as well as preparation method and application thereof

A fluorescent material, molybdenum tungstate technology, applied in the direction of luminescent materials, chemical instruments and methods, the use of gas discharge lamps, etc., can solve the problems of cumbersome production process, complex chemical composition, etc. High, simple method and effective effect

Inactive Publication Date: 2011-09-28
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application number 200710160211.1 discloses a LaN containing europium and lanthanum b TiO 6 :Eu 3+ Red fluorescent materials also use the sol-gel method, but the chemical composition is complex and the production process is cumbersome, involving La, Eu rare earth elements and noble metal N b element

Method used

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  • Fluorescent material with molybdate and tungstate as matrixes as well as preparation method and application thereof
  • Fluorescent material with molybdate and tungstate as matrixes as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) In accordance with 0.1Eu 3+ :Na 5 Y 0.9 (WO 4 ) 2 (MoO 4 ) 2 The molar ratio represented by the chemical formula uses the electronic balance to weigh Na respectively 2 MoO 4 2H 2 O. WO 3 , Y 2 o 3 、MoO 3 、Na 2 CO 3 、Eu 2 o 3 Raw materials (the purity of each chemical component is above 99.99%), the following reaction formula is used for batching:

[0030] 2Na 2 CO 3 + 3Na 2 MoO 4 2H 2 O +4WO 3 +0.1Eu 2 o 3 +0.9Y 2 o 3 +MoO 3

[0031] →2Eu 3+ :Na 5 Y 0.9 (WO 4 ) 2 (MoO 4 ) 2 +2CO 2 ↑+6H 2 o

[0032] (2) Fully grind the above-mentioned weighed raw materials in a corundum mortar for more than half an hour until they are evenly mixed, then put them into a platinum crucible, and place them in a high-temperature heating furnace for heating, and use a temperature controller to set the heating program. The heating temperature program is to increase the temperature from room temperature to 600°C at a rate of about 70°C / hour, and sinter...

Embodiment 2

[0035] (1) In accordance with 0.5Eu 3+ :Na 5 Y 0.5 (WO 4 ) 2 (MoO 4 ) 2 The molar ratio represented by the chemical formula uses the electronic balance to weigh Na respectively 2 MoO 4 2H 2 O. WO 3 , Y 2 o 3 、MoO 3 、Na 2 CO 3 、Eu 2 o 3 The raw material adopts the reaction formula similar to Example 1 to carry out during batching

[0036] (2) Put the above-mentioned weighed raw materials in a corundum mortar, grind them, mix them uniformly, put them into a crucible, and heat them in a high-temperature heating furnace according to Example 1, and use a temperature controller to set the temperature rise program. The heating temperature program is to increase the temperature from room temperature to 630°C at a rate of 75°C / hour, and sinter at this temperature for 7 hours, then cool down to 190°C at a rate of about 65°C / hour and then stop the heating equipment , and finally let the material cool down to room temperature and take it out.

[0037] (3) Grind the take...

Embodiment 3

[0039] (1) In accordance with 0.8Eu 3+ :Na 5 Y 0.2 (WO 4 ) 2 (MoO 4 ) 2 The molar ratio represented by the chemical formula uses the electronic balance to weigh Na respectively 2 MoO 4 2H 2 O. WO 3 , Y 2 o 3 、MoO 3 、Na 2 CO 3 、Eu 2 o 3 The raw material, batching method is similar to embodiment 1 and embodiment 2.

[0040] (2) The processing steps and methods of the weighed raw materials are the same as in Example 1 and Example 2. The heating temperature program is to rise to 650 °C at a heating rate of about 80 °C / hour, and sinter at this temperature for 8 hours at a constant temperature, and then After cooling down to 200°C at a cooling rate of 70°C / hour, stop the heating equipment, and finally allow the material to cool naturally to room temperature before taking it out.

[0041] (3) Grind the taken out sample again in a corundum mortar, and then put the sample into a 250-mesh sieve for sieving treatment to obtain the europium-doped sodium yttrium tetramoly...

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Abstract

The invention discloses a fluorescent material with molybdate and tungstate as matrixes as well as a preparation method and application thereof. The fluorescent material with molybdate and tungstate as the matrixes is a light-emitting material of europium-doped sodium tetramolybdate yttrium tungstate and has a chemical formula of xEu<3+>:Na5Y1-x(WO4)2(MoO4)2, wherein x is 0.1-0.8. The light-emitting material can be effectively excited by a near ultraviolet light and blue light chip, has favorable stability and color rendering and high fluorescence intensity and is a red fluorescent powder material which has excellent performance and can be used for a white LED. The fluorescent material with molybdate and tungstate as the matrixes is prepared by adopting a high-temperature solid-phase synthesis method; the preparation method is simple and feasible; and the molybdate and tungstate fluorescent material can be obtained by setting proper temperature heating procedures.

Description

technical field [0001] The invention relates to the technical field of fluorescent materials in luminescent physics and their preparation, in particular to a fluorescent material with molybdenum tungstate as a matrix, its preparation method and application. Background technique [0002] In the early 1990s, GaN-based blue and violet light-emitting diodes (LEDs) were first successfully developed by Nichia Corporation of Japan, making LED full-color display and semiconductor lighting possible. White LED has the advantages of all solid, cold light source, long life, small size, high luminous efficiency, good weather resistance, no mercury pollution, etc., and has been widely used in lighting, display, automobile and other fields. [0003] At present, one of the main ways to realize white LED is to combine a semiconductor chip with one or more phosphors to form a white LED. This method of obtaining white LED is called "phosphor conversion method". Currently commercially, the nea...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/50
CPCY02B20/181Y02B20/00
Inventor 付乔克胡志朋陈振强张俊朱思祁
Owner JINAN UNIVERSITY
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