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Cadmium tungstate crystal and preparation method thereof

A technology of cadmium tungstate and crystals, which is applied in the field of synthetic luminescent crystal materials, can solve problems such as poor physical and chemical properties, inhibit application, etc., and achieve good thermal stability and high-efficiency laser output effects

Inactive Publication Date: 2009-09-23
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, at home and abroad, only Okhrimchuky of the Russian National Academy of Sciences has reported on Bi ion-doped halide crystals. [5] , so far there is no public report on the growth process and infrared luminescence characteristics of the oxide crystal doped with the above ions
However, the poor physical and chemical properties of halide crystals seriously inhibit their application in laser and other fields.

Method used

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  • Cadmium tungstate crystal and preparation method thereof
  • Cadmium tungstate crystal and preparation method thereof
  • Cadmium tungstate crystal and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A Bi-doped cadmium tungstate crystal with near-infrared broadband luminescent properties, the preparation method of which is as follows:

[0027] (1) CdO and WO 3 The raw materials were respectively placed in corundum crucibles and roasted in a muffle furnace at a temperature of 250°C for 4 hours;

[0028] (2) Mix CdO and WO at a molar ratio of 1:1 3 Place in an organic plastic or ceramic mill, grind and mix for 4 hours, and press the mixed powder into a dense block with a pressure of 4.9×10 8 Pa (Pa);

[0029] (3) Put the above blocks in a Pt crucible, and sinter them for 5 hours at a temperature of 1100° C. to obtain polycrystalline powder;

[0030] (4) Put the polycrystalline powder in a grinder and grind it into powder, add Bi ions in an amount of 0.5 mol.%, and grind and mix for 11 hours to obtain a polycrystalline powder doped with Bi;

[0031] (5) Place the polycrystalline powder in the Pt crucible after being compacted, and seal it in the Pt crucible;

[00...

Embodiment 2

[0035] A Bi-doped cadmium tungstate crystal with near-infrared broadband luminescent properties, the preparation method of which is as follows:

[0036] (1) CdO and WO3 The raw materials were placed in corundum crucibles respectively, and roasted in a muffle furnace at a roasting temperature of 400°C for 3 hours;

[0037] (2) Mix CdO and WO at a molar ratio of 1:1 3 Place in an organic plastic or ceramic mill, grind and mix for 2 hours, and press the mixed powder into a dense block with a pressure of 7.84×10 8 Pa (Pa);

[0038] (3) Put the above blocks in a Pt crucible, and sinter them for 8 hours at a temperature of 1000° C. to obtain polycrystalline powder;

[0039] (4) Put the polycrystalline powder in a grinder and grind it into powder, add Bi ions in an amount of 0.2 mol.%, and grind and mix for 10 hours to obtain a polycrystalline powder doped with Bi;

[0040] (5) Place the polycrystalline powder in the Pt crucible after being compacted, and seal it in the Pt crucibl...

Embodiment 3

[0044] A Bi-doped cadmium tungstate crystal with near-infrared broadband luminescent properties, the preparation method of which is as follows:

[0045] (1) CdO and WO 3 The raw materials were placed in corundum crucibles respectively, and roasted in a muffle furnace at a roasting temperature of 500°C for 2 hours;

[0046] (2) Mix CdO and WO at a molar ratio of 1:1 3 Place in an organic plastic or ceramic mill, grind and mix for 6 hours, and press the mixed powder into a dense block with a pressure of 1.96×10 8 Pa (Pa);

[0047] (3) Put the above blocks in a Pt crucible, and sinter them for 2 hours at a temperature of 1200° C. to obtain polycrystalline powder;

[0048] (4) Put the polycrystalline powder in a grinder and grind it into powder, add Bi ions in an amount of 1.1 mol.%, and grind and mix for 12 hours to obtain a polycrystalline powder doped with Bi;

[0049] (5) Place the polycrystalline powder in the Pt crucible after being compacted, and seal it in the Pt cruci...

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Abstract

The invention discloses a cadmium tungstate crystal with near-infrared broadband luminescence property and a preparation method thereof. The cadmium tungstate crystal adopts CdWO4 single crystal as matrix and 0.1 to 2.0mol% of Bi ion is doped into the matrix; the Bi:CdWO4 oxide crystal grows by a crucible descending method; the temperature of the furnace for growing the crystal is 1330 to 1380 DEG C, the inoculating temperature is 1280 to 1300 DEG C, the temperature gradient for growth area is 20 to 40 DEG C and the descending rate is 0.5 to 2mm / h; after the growth of the crystal is ended, the furnace temperature is descended to room temperature by 20 to 80 DEG C / h and the Bi:CdWO4 crystal is obtained; the Bi-doped cadmium tungstate oxide crystal has good physical-chemical stability, and the structural characteristics of the crystal thereof can provide luminous environment with higher efficiency for luminescence center; the invention is beneficial to realizing laser output with high efficiency and can be widely applied to the optical fields of infrared broadband optical amplifiers, tunable lasers and the like.

Description

technical field [0001] The invention relates to the technical field of synthesizing luminescent crystal materials, in particular to a cadmium tungstate crystal and a preparation method thereof. Background technique [0002] Existing 001, Japanese scholar Fujimoto et al. [1] First reported that Bi ion-doped quartz glass produced infrared luminescence with a wavelength of 1000-1700nm under the action of 800nmLD pumping, and realized the amplification of light in the 1.3μm band [2] . Eye-safe near-infrared lasers have broad application prospects in remote sensing, ranging, environmental detection, bioengineering, and medical treatment. This material is likely to be used in infrared broadband optical amplifiers and tunable lasers. It is particularly encouraging that in 2005 Dianov et al. achieved laser output with a wavelength of 1150-1300nm in a Bi-doped glass fiber [3] , they have recently achieved laser output in the 1300-1470nm band [4] . The existing research on Bi-dop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B11/00
Inventor 夏海平王金浩虞灿罗彩香陈红兵
Owner NINGBO UNIV
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