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Visible and infrared luminescent C12A7 powder and preparation method thereof

A technology of infrared luminescence and dodecacalcium, which is applied in the field of materials and can solve problems affecting the luminous efficiency of rare earths

Inactive Publication Date: 2008-04-09
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Many semiconductor and insulator materials are used as host materials doped with erbium, but the light absorption and emission of rare earth ions are restricted by effects such as temperature quenching and concentration quenching, which affect the luminous efficiency of rare earth ions.

Method used

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  • Visible and infrared luminescent C12A7 powder and preparation method thereof
  • Visible and infrared luminescent C12A7 powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. get 7.878g (0.02100mol) purity to be 99.99% Al (NO 3 ) 3 powder and 1.998 g (0.01800 mol) of 99.95% pure CaCl 2 The raw materials are uniformly mixed in the water phase at the atomic level according to the chemical dosage ratio of 14:12;

[0021] 2. Add 0.04800g (0.000105mol) of Er(NO) with a purity of 99.99% 3 ) 3 The raw materials are doped according to the atomic molar ratio of erbium to aluminum at 0.5%, and the precipitant NH is added after uniform mixing 3 .H 2 O, to adjust the distance between cations. Slowly pour the mixed solution into the excess NH 3 .H 2 O in a beaker to ensure that each cation can be uniformly precipitated according to a certain ratio without causing phase separation, and 0.5% erbium-doped heptaaluminate dodecacalcium (12CaO 7Al 2 o 3 ) gel precursor.

[0022] 3. The obtained erbium-doped calcium heptaaluminate (12CaO·7Al 2 o 3 ) The gel precursor is dried and dehydrated at a temperature of 100°C;

[0023] 4. Put it in a high...

Embodiment 2

[0026] 1. get 7.787g (0.02100mol) purity to be 99.99% Al (NO 3 ) 3 powder and 1.998 g (0.01800 mol) of 99.95% pure CaCl 2 The raw materials are uniformly mixed in the water phase at the atomic level according to the chemical dosage ratio of 14:12;

[0027] 2. Add 0.009688g (0.000021mol) of 99.99% Er(NO 3 ) 3 The raw materials are doped according to the atomic molar ratio of erbium to aluminum at 0.1%, and the precipitant NH is added after uniform mixing 3 .H 2 O, to adjust the distance between cations. Slowly pour the mixed solution into the excess NH 3 .H 2 O in a beaker to ensure that each cation can be uniformly precipitated according to a certain ratio without causing phase separation, and 0.1% erbium-doped heptaaluminate dodecacalcium (12CaO 7Al 2 o 3 ) gel precursor.

[0028] 3. The obtained 0.1% erbium doped calcium heptaaluminate (12CaO·7Al 2 o 3 ) The gel precursor is dried and dehydrated at a temperature of 90°C;

[0029] 4. Put it in a high-temperature ...

Embodiment 3

[0032] Steps 1 and 2 are the same as in the embodiment, the drying and water removal time in step 3 is 120°C, the sintering temperature in step 4 is 1250°C, and the time is 6 hours.

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Abstract

The invention belongs to the material technical field, in particular to the selection of the matrix-materials doped with erbium and the control of rare earth lightening and a compound method thereof. The invention adopts a hot treatment technology of chemical coprecipitation. The '12:7'calcium aluminate powder which has highly efficient green, red, and infrared luminescence is gained by adjusting the mole ration of erbium and calcium ion less than 1100 DEG C, which is the temperature of hot treatment. Band-gap oxide '12:7' calcium aluminate is used as a matrix-material of doped erbium, in order to reduce the temperature quenching effect emitted in order to reduce the rare earth Er. The interior of the special cavity structure of '12:7' calcium aluminate restraints oxygen ion group. The characteristic that Cationic site symmetry is comparatively low is conducive to strengthening the emission of Er. And the disadvantages of uneven doped erbium resulted from the solid-state sintering method and the high temperature of sintering are overcome. The invention can reduce the temperature by 250 DEG C. The invention has low cost, controllable condition, and simple technique, and can be applied to the fields such as color display and optical communication, etc.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to the selection of host material for erbium doping, the control of rare earth erbium luminescence and its synthesis method. Background technique [0002] Many semiconductor and insulator materials are used as host materials for erbium doping, but the light absorption and emission of rare earth ions are restricted by effects such as temperature quenching and concentration quenching, which affect the luminous efficiency of rare earth ions. Favennec et al first proved in 1989 that the luminescence of rare earth erbium is related to the width of the band gap of the matrix, the wider the band gap of the matrix, the weaker the temperature quenching effect of the luminescence, "Electronics Letters". Ishii et al. have shown that the luminescence of erbium is related to the number of oxygen atoms coordinated with it around it. The symmetry of the local crystal field of the ho...

Claims

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Application Information

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IPC IPC(8): C09K11/80C09K11/55
Inventor 刘玉学王丹徐长山刘益春李兴华钟殿强
Owner NORTHEAST NORMAL UNIVERSITY
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