Preparation method of CaMoO4: Eu3+, Li+ red phosphor

A red phosphor, ca1-xmoo4 technology, applied in chemical instruments and methods, luminescent materials, etc., to achieve the effects of prolonging burning time, low energy consumption, and improving luminous performance

Inactive Publication Date: 2012-06-06
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far there is no information about the preparation of CaMoO by combustion synthesis. 4 :Eu 3+ , Li + report on fluorescent materials

Method used

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  • Preparation method of CaMoO4: Eu3+, Li+ red phosphor
  • Preparation method of CaMoO4: Eu3+, Li+ red phosphor
  • Preparation method of CaMoO4: Eu3+, Li+ red phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the chemical formula Ca 1-x MoO 4 :Eu 3+ x , Li + y (x=0.18, y=0.10) Weigh the corresponding medicines.

[0022] Take Ca(NO 3 ) 2 4H 2 O 0.5807g, Eu(NO 3 ) 3 ·6H 2 O 0.2409g is dissolved in water to form a solution, and Li 2 CO 3 0.0111g is dissolved in nitric acid to form nitric acid solution, and the two solutions are mixed to obtain solution A; get (NH 4 ) 6 Mo 7 o 24 4H 2O 0.5297g was dissolved in water to obtain solution B, and solution A was added while stirring in solution B, then urea 0.9008g and thiourea 0.2283g were added to obtain suspension C; adjust the pH value of suspension C to 4.0 with ammonia water , to obtain a suspension D; move the suspension D into a combustion reaction furnace, and carry out a combustion reaction at 800 ° C. The reaction ends within 4 minutes, and the reaction product is CaMoO according to the present invention. 4 :Eu 3+ , Li + red phosphor.

[0023] figure 1 The real photo of the sample prepared...

Embodiment 2

[0027] According to the chemical formula Ca 1-x MoO 4 :Eu 3+ x , Li + y (x=0.15, y=0.10) Weigh the corresponding medicines.

[0028] Take Ca(NO 3 ) 2 4H 2 O 0.6020g, Eu(NO 3 ) 3 ·6H 2 O 0.2007g, it is dissolved in water, take Li 2 CO 3 0.0111g is dissolved in nitric acid, and two solutions are mixed to obtain solution A; Take (NH 4 ) 6 Mo 7 o 24 4H 2 O 0.5297g was dissolved in water to obtain solution B, and solution A was added while stirring in solution B, then urea 0.7207g and thiourea 0.4567g were added to obtain suspension C; adjust the pH value of suspension C to 3.5 with ammonia water , to obtain a suspension D; move the suspension D into a combustion reaction furnace at 700°C to carry out a combustion reaction, and the reaction ends within 5 minutes to obtain the CaMoO of the present invention. 4 :Eu 3+ , Li + red phosphor.

Embodiment 3

[0030] According to the chemical formula Ca 1-x MoO 4 :Eu 3+ x , Li + y (x=0.20, y=0.15) Weigh the corresponding drugs.

[0031] Take Ca(NO 3 ) 2 4H 2 O 0.5666g, Eu(NO 3 ) 3 ·6H 2 O 0.2676g dissolved in water, take Li 2 CO 3 0.0166g is dissolved in nitric acid, and two solutions are mixed to obtain solution A; Take (NH 4 ) 6 Mo 7 o 24 4H 2 O0.5297g was dissolved in water to obtain solution B, and solution A was added while stirring in solution B, then urea 1.0810g and thiourea 0.1142g were added to obtain suspension C; the pH value of suspension C was adjusted to 4.0 with ammonia water , to obtain a suspension D; move the suspension D into a combustion reaction furnace at 600°C to carry out a combustion reaction, and the reaction ends within 3 minutes to obtain the CaMoO of the present invention. 4 :Eu 3+ , Li + red phosphor.

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Abstract

The invention discloses a CaMoO4: Eu3+, Li+ red phosphor and a preparation method thereof, which belong to the field of luminescence materials. The CaMoO4: Eu3+, Li+ red phosphor is prepared by using Ca (NO3) 2.4H2O, (NH4) 6Mo7O24.4H2O, Eu (NO3) 3.6H2O and Li2CO3 as raw materials and using urea and thiourea as fuel through the steps of adjusting the pH value of solution with ammonia liquor; and then putting a precursor into a burning reaction furnace preheated to 600 to 800 DEG C to directly carry out combustion synthesis reaction so as to obtain the CaMoO4: Eu3+, Li+ red phosphor. Compared with the prior art, in the invention, urea and thiourea are used as fuel together, which ensures the combustion temperature and extends the combustion time, so that the luminous property of the obtained product is greatly improved, and the obtained product is fragile; and the method is simple to operate, does not require high temperature treatment, and is easy to realize industrialization.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a CaMoO 4 :Eu 3+ , Li + Preparation method of red fluorescent powder. Background technique [0002] Rare earth molybdates have good thermal and chemical stability, and are an important class of luminescent materials. Trivalent europium activated CaMoO 4 The basic red phosphor has two strong excitation peaks near 395nm (near ultraviolet light) and 465nm (blue light), which are very compatible with the current LED chips. Red phosphor for LED [Yunsheng Hu, WeidongZhuang, Hongqi Ye, et al. A novel red phosphor for white light emitting diodes. Journal of Alloys and Compounds 390(2005) 226-229]. In CaMoO 4 Medium, Eu 3+ Inequivalent replacement of Ca 2+ will form a positively charged defect, which can be achieved by adding other cations, such as Li + , Na + , K + [Jie Liu, Hongzhou Lian, Chunshan Shi, Improved optical photoluminescence by charge compensation in the phosp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/68
Inventor 梁振华彭桂花冯玉芝卢锋奇韩小宝王夏
Owner GUANGXI NORMAL UNIV
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