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Europium-doped hydrated zinc molybdate high-efficient red fluorescent powder and preparation method thereof

A technology of hydrated zinc molybdate and red phosphor, which is applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of phosphor hardness, long reaction time, and large particle size, and achieves a simple preparation method, Enhanced luminous brightness and easy handling

Inactive Publication Date: 2011-12-14
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The high-temperature solid-phase method consumes a lot of energy, takes a long time to react, and the synthesized phosphor has relatively high hardness and large particle size.

Method used

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  • Europium-doped hydrated zinc molybdate high-efficient red fluorescent powder and preparation method thereof
  • Europium-doped hydrated zinc molybdate high-efficient red fluorescent powder and preparation method thereof
  • Europium-doped hydrated zinc molybdate high-efficient red fluorescent powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 2: Weigh Zn(NO 3 ) 2 6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O, Eu 2 o 3 and Li 2 CO 3 . According to the method similar to Example 1, a phosphor sample added with charge compensator Li was obtained. Its fluorescence spectrum see image 3 , compared with the phosphor powder without charge compensator, the fluorescence intensity is greatly enhanced. Similarly, phosphor samples added with charge compensator K and Na have also been obtained, but the enhancement of fluorescence intensity is not as good as that of Li.

Embodiment 2

[0034] Embodiment 3: according to molar ratio: Zn:Mo:Eu=0.75:1:0.25 takes Zn (NO 3 ) 2 6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O and Eu 2 o 3 , according to the method similar to Example 1 to obtain a precipitate, then let it stand for 3-5 hours, filter it with suction, dry it, and grind it to obtain a sample. Its emission spectrum see Figure 4 Middle a.

Embodiment 3

[0035] Embodiment 4: according to molar ratio: Zn: Mo: Eu=0.75:1:0.25 takes Zn (NO 3 ) 2 6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O and Eu 2 o 3 According to the method similar to Example 3, the obtained precipitate was left to stand at room temperature for 12 hours, filtered with suction, dried, and ground to obtain a sample. Its emission spectrum see Figure 4 middle d.

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Abstract

The invention relates to europium-doped hydrated zinc molybdate high-efficient red fluorescent powder and a preparation method thereof. The main crystalline phase of the fluorescent powder is zinc dimolybdate pentahydrate (or calcium, gadolinium and other alkaline earth or rare earth metal replacing parts of zinc); and during synthesizing, batching is carried out according to a general formula of A1-x-yMoO4:EuxBy. The preparation method comprises the following steps of: reacting the prepared zinc-containing and zinc-substituted ionized calcium and rare earth ion solution with an alkali metal or ammonium molybdate under appropriate conditions; regulating PH (Potential of Hydrogen) to completely precipitate; filtering directly or filtering after aging for a period of time, and washing the precipitate; and drying at a normal temperature to finish the preparation. According to the invention, the preparation method is simple and easy to operate; moreover, the red fluorescent powder has a good luminous effect and stable physical and chemical properties, can be well matched with near-ultraviolet and blue-light LED (Light Emitting Diode) chips, and can be used as red fluorescent powder of a novel high-efficient white-light LED.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and specifically relates to a red fluorescent powder that can be effectively excited by near-ultraviolet and blue light and a preparation method thereof. The fluorescent powder can be used in the fields of white light LED appliances, biological probes, medical imaging, and the like. Background technique [0002] Luminescent materials have many applications, among which solid-state white light illumination and biological probes are the most popular areas of current research. Different application purposes have different requirements for phosphors. Therefore, designing and synthesizing high-efficiency fluorescent materials according to specific application requirements is the focus of current research. [0003] White light-emitting diodes (LEDs) have the characteristics of high efficiency, low energy consumption, and no pollution. They are environmentally friendly and energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68H01L33/50
CPCY02B20/181Y02B20/00
Inventor 李永绣饶阳周雪珍李颖毅胡小野欧阳春梅
Owner NANCHANG UNIV
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