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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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

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Example Embodiment

[0028] Example 1

[0029] (1) According to 0.1Eu 3+ :Na 5 Y 0.9 (WO 4 ) 2 (MoO 4 ) 2 The molar ratio expressed by the chemical formula uses electronic balance to weigh Na 2 MoO 4 ·2H 2 O, WO 3 , Y 2 O 3 , MoO 3 , Na 2 CO 3 , Eu 2 O 3 The raw materials (the purity of each chemical component is above 99.99%), the compounding is carried out according to the following reaction formula:

[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) Grind the above 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 temperature rise rate of about 70°C / hour, sinter at this temperature fo...

Example Embodiment

[0034] Example 2

[0035] (1) According to 0.5Eu 3+ :Na 5 Y 0.5 (WO 4 ) 2 (MoO 4 ) 2 The molar ratio expressed by the chemical formula uses electronic balance to weigh Na 2 MoO 4 ·2H 2 O, WO 3 , Y 2 O 3 , MoO 3 , Na 2 CO 3 , Eu 2 O 3 The raw materials of, use the similar reaction formula as in Example 1 to carry out

[0036] (2) Put the above weighed raw materials in a corundum mortar, after grinding, uniformly mixing, loading into a crucible, and heating in a high-temperature heating furnace in accordance with the similar processes in Example 1. Set the temperature rising program with a temperature controller. The heating temperature program is to increase from room temperature to 630°C at a temperature rise rate of 75°C / hour, sinter at this temperature for 7 hours, and then cool down to 190°C at a rate of about 65°C / hour, and then start to stop the heating equipment , And finally let the material cool to room temperature and take it out.

[0037] (3) Grind the taken-out sample in...

Example Embodiment

[0038] Example 3

[0039] (1) According to 0.8Eu 3+ :Na 5 Y 0.2 (WO 4 ) 2 (MoO 4 ) 2 The molar ratio expressed by the chemical formula uses electronic balance to weigh Na 2 MoO 4 ·2H 2 O, WO 3 , Y 2 O 3 , MoO 3 , Na 2 CO 3 , Eu 2 O 3 The raw materials and the batching method are similar to those in Example 1 and Example 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 increase to 650°C at a temperature rising rate of about 80°C / hour, and sinter at this temperature for 8 hours. After cooling down to 200°C at a cooling rate of 70°C / hour, stop the heating equipment, and finally let the material cool to room temperature before taking it out.

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

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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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