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Preparation method of tungstate red phosphor

A technology of red phosphor and tungstate, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of poor thermal stability, low luminous efficiency of red phosphor, low synthesis temperature, etc., and achieve good luminous performance , high color purity, uniform doping effect

Inactive Publication Date: 2019-08-27
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the problems existing in the prior art, the purpose of the present invention is to provide a kind of preparation method of tungstate red fluorescent powder, tungstate CaGd of the present invention 2-x Eu x (WO 4 ) 4 The red phosphor has the advantages of nanoscale, good dispersion, and high color purity, which solves the problems of low luminous efficiency and poor thermal stability of traditional red phosphors. The preparation method has low synthesis temperature and mild conditions, and can be prepared A new type of tungstate CaGd with nanoscale, good dispersion and high color purity 2-x Eu x (WO 4 ) 4 red phosphor

Method used

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  • Preparation method of tungstate red phosphor
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  • Preparation method of tungstate red phosphor

Examples

Experimental program
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Embodiment 1

[0034] Step 1, according to calcium nitrate Ca(NO 3 ) 2 4H 2 O, gadolinium nitrate Gd(NO 3 ) 3 ·6H 2 O, europium nitrate Eu(NO 3 ) 3 ·6H 2 O and sodium tungstate Na 2 WO 4 2H 2 The molar ratio of O was 1:0.9:1.1:8 for experiments. Its specific steps are: first, calcium nitrate Ca(NO 3 ) 2 4H 2 O, gadolinium nitrate Gd(NO 3 ) 3 ·6H 2 O, europium nitrate Eu(NO 3 ) 3 ·6H 2 O and sodium tungstate Na 2 WO 4 2H 2 O was dissolved in deionized water respectively, and prepared into 1 mol / L calcium nitrate solution, 1 mol / L gadolinium nitrate solution, 1 mol / L europium nitrate solution, and 2 mol / L sodium tungstate solution for use.

[0035] Then measure 5ml of calcium nitrate solution, 4.5ml of gadolinium nitrate solution, and 5.5ml of europium nitrate solution for magnetic stirring and mixing for 12 minutes to obtain mixed solution A; under magnetic stirring, drop mixed solution A into 20ml of sodium tungstate solution , a white precipitate appeared during the r...

Embodiment 2

[0038] In step 1, the experiment is carried out according to the molar ratio of calcium nitrate, gadolinium nitrate, europium nitrate and sodium tungstate being 1:1.1:0.9:6. Its specific steps are: first, calcium nitrate Ca(NO 3 ) 2 4H 2 O, gadolinium nitrate Gd(NO 3 ) 3 ·6H 2 O, europium nitrate Eu(NO 3 ) 3 ·6H 2 O and sodium tungstate Na 2 WO 4 2H 2 O was dissolved in deionized water respectively, and prepared into 1 mol / L calcium nitrate solution, 1 mol / L gadolinium nitrate solution, 1 mol / L europium nitrate solution, and 2 mol / L sodium tungstate solution for use.

[0039] Then measure 5ml of calcium nitrate solution, 5.5ml of gadolinium nitrate solution, and 4.5ml of europium nitrate solution for magnetic stirring and mixing for 15 minutes to obtain mixed solution A; under magnetic stirring, drop mixed solution A into 15ml of sodium tungstate solution , a white precipitate appeared during the reaction, and the reaction was completed to obtain a mixed solution B;...

Embodiment 3

[0042] Carry out the experiment of different pH according to the test condition of embodiment 2, wherein, the pH of adjusting mixed solution B in step 1 is respectively 7 and 9, obtains two groups of tungstate CaGd 1.1 Eu 0.9 (WO 4 ) 4 red phosphor.

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Abstract

The invention discloses a preparation method of a tungstate red phosphor. The preparation method mainly comprises the following steps: respectively preparing a salt solution of each component by massratio, stirring and mixing the salt solutions of calcium, gadolinium and europium to form a mixed solution A; then, dropwise adding a sodium tungstate solution into the mixed solution A, and then adjusting the pH value of the mixed solution to obtain a suspension C; performing hydrothermal reaction, centrifugal washing, filtration and drying on the suspension C to obtain the Eu<3+> ion doped tungstate CaGd2-xEux(WO4)4 red phosphor. The product obtained by the preparation method has the advantages of nanometer grade, good dispersibility and high color purity, and solves the problems that a traditional red phosphor has low luminous efficiency and poor thermal stability. The preparation method has low synthesis temperature and mild conditions, so that the product is high in granularity controllability.

Description

technical field [0001] The invention relates to the technical field of fluorescent materials and preparation methods thereof, in particular to a preparation method of tungstate red fluorescent powder. Background technique [0002] White light-emitting diodes (LEDs) are considered to be the fourth generation of green light sources after incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps due to their advantages of high brightness, energy saving, long life, small size and high reliability. At present, the main way to commercialize white LEDs is to combine blue InGaN chips with yellow Y 3 Al 5 o 12 : Ce 3+ Combining phosphor powder, the blue light generated by the LED chip and the yellow light generated by the phosphor powder are combined to obtain white light. However, due to the lack of red components in the emission spectrum of the phosphor powder, the color rendering index of the white LED is low and the color temperature is high. [0003] Resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7794H01L33/502
Inventor 李桂芳刘垣汐卫云鸽姜海青
Owner XIDIAN UNIV
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