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Synthesis method of terbium-doped gadolinium niobate green fluorescent powder

A technology of green fluorescent powder and synthesis method, which is applied in the field of new preparation of gadolinium niobate doped terbium green fluorescent powder, can solve the problem of lack of fluorescent powder, achieve energy saving, high luminous intensity, and reduce the effect of solid phase reaction temperature

Inactive Publication Date: 2016-06-15
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the concentration increases, the intensity of these peaks decreases due to cross-relaxation between energy levels, while at 5 D. 4 → 7 f J Among the transitions, the stronger one is 5 D. 4 → 7 f 5 The emission peak corresponds to a wavelength of 542nm to 550nm, which corresponds to the green light in the visible light region, but so far about GdNbO 4 :Tb 3+ There is almost no research on the preparation and luminescent properties of phosphors, so it is of great significance to explore and synthesize

Method used

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  • Synthesis method of terbium-doped gadolinium niobate green fluorescent powder
  • Synthesis method of terbium-doped gadolinium niobate green fluorescent powder

Examples

Experimental program
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Embodiment 1

[0022] Get 0.423 grams of niobium pentoxide (Nb 2 o 5 ), 0.018 grams of tetraterbium heptoxide (Tb 4 o 7 ) and 0.560 grams of gadolinium trioxide (Gd 2 o 3 ) into the ball mill jar, and put into 4 diameters of 1 cm and 4 diameters of 0.5 cm stainless steel balls (a total of 20 grams of steel balls) according to the mass ratio of the ball-to-material ratio of 20:1, and then put the ball mill jar into the planetary Ball milling in a type ball mill for 30 minutes, and finally the resulting mixture was placed in a box-type experimental resistance furnace at 1200 ° C for 4 hours, and then slowly cooled to room temperature with the furnace to obtain gadolinium niobate (GdNbO 4 :3%Tb 3+ ) green phosphor.

[0023] figure 1 (a) shows its XRD pattern, it can be seen from the figure that its characteristic peaks are closely related to GdNbO 4 The standard card (JCPDSno.22-1104) is completely consistent, 3% Tb 3+ The incorporation of ions did not cause structural changes. figur...

Embodiment 2

[0025] Get 0.423 grams of niobium pentoxide (Nb 2 o 5 ), 0.030 g terbium heptoxide (Tb 4 o 7 ) and 0.549 grams of gadolinium trioxide (Gd 2 o 3 ) into the ball mill jar, and put into 4 diameters of 1 cm and 4 diameters of 0.5 cm stainless steel balls (a total of 20 grams of steel balls) according to the mass ratio of the ball-to-material ratio of 20:1, and then put the ball mill jar into the planetary Ball milling in a type ball mill for 30 minutes, and finally the resulting mixture was placed in a box-type experimental resistance furnace at 1200 ° C for 4 hours, and then slowly cooled to room temperature with the furnace to obtain gadolinium niobate (GdNbO 4 :5%Tb 3+ ) green phosphor.

[0026] figure 1 (b) shows its XRD pattern, it can be seen from the figure that its characteristic peaks are closely related to GdNbO 4 The standard card (JCPDSno.22-1104) is completely consistent, 5% Tb 3+ The incorporation of ions did not cause structural changes. figure 2 (b) show...

Embodiment 3

[0028] Get 0.423 grams of niobium pentoxide (Nb 2 o 5 ), 0.042 g terbium heptoxide (Tb 4 o 7 ) and 0.536 grams of gadolinium trioxide (Gd 2 o 3 ) into the ball mill jar, and put into 4 diameters of 1 cm and 4 diameters of 0.5 cm stainless steel balls (a total of 20 grams of steel balls) according to the mass ratio of the ball-to-material ratio of 20:1, and then put the ball mill jar into the planetary Ball milling in a type ball mill for 30 minutes, and finally the resulting mixture was placed in a box-type experimental resistance furnace at 1200 ° C for 4 hours, and then slowly cooled to room temperature with the furnace to obtain gadolinium niobate (GdNbO 4 :7%Tb 3+ ) green phosphor.

[0029] figure 1 (c) shows its XRD spectrum, it can be seen from the figure that its characteristic peaks are closely related to GdNbO 4 The standard card (JCPDSno.22-1104) completely matches, 7% Tb 3+ The incorporation of ions did not cause structural changes. figure 2 (c) shows its...

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Abstract

The invention relates to a synthesis method of terbium-doped gadolinium niobate green fluorescent powder. The provided method can effectively reduce solid phase sintering temperature, and the acquired fluorescent powder has strong luminous intensity. The technical scheme is as follows: the synthesis method of terbium-doped gadolinium niobate green fluorescent powder comprises the following steps: 1) burdening: weighing a certain mass of gadolinium oxide, tetraterbium heptaoxide and niobium pentoxide powder to place in a ball-milling tank, wherein the proportion of the mole amount of tetraterbium heptaoxide in the total mole amount of the rare earth element is controlled to be less than 7%, and the mole ratio of the rear earth total mole amount and the mole amount of niobium pentoxide is controlled to be 1: 1; 2) ball-milling: adding a plurality of stainless steel balls with different diameters in the ball-milling tank, and grinding the ball-milling tank in a planet type ball mill for a certain time under a certain ball-material mass ratio in the rotary speed of 280-320r / m after mixing the obtained burden in the step 1); 3) baking: placing the ball-milled product in a furnace to bake for a certain time at a certain temperature to obtain a final product.

Description

technical field [0001] The invention relates to a novel method for preparing gadolinium niobate-doped terbium green fluorescent powder. Background technique [0002] Since the luminous peak wavelength of the green phosphor is almost the same as the peak wavelength of the light-sensitivity curve, it has the greatest impact on the luminous efficiency of the three primary color phosphors. Therefore, the research on high-efficiency green phosphors has always been a subject that people attach great importance to. Commonly used commercial green phosphor Y in the market 3 al 5 o 12 :Tb 3+ (YAG:Tb), because it is usually prepared by high-temperature solid-state reaction, even at a high temperature of 1500 ° C, there are still residual impurities in the crystal, which seriously affects the purity of the phosphor. [0003] Rare earth orthoniobate is a potential new host for a class of luminescent materials, but the current research is relatively focused on the synthesis and struct...

Claims

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Application Information

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IPC IPC(8): C09K11/78
CPCC09K11/7766
Inventor 周伟杰高林辉王广发
Owner ZHEJIANG SCI-TECH UNIV