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Luminescent material of aluminate, and preparation

A luminescent material, aluminate technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of decreased luminous brightness, long production cycle, large crystal grains, etc., and achieve improved luminous performance, long afterglow time, and luminous efficiency. high effect

Inactive Publication Date: 2007-12-26
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-temperature solid-phase method also has certain disadvantages: this method requires the crystals to grow slowly under high temperature for several hours, and the obtained products generally have larger grains and high hardness, and need to be ground by ball milling, so the crystal form may be damaged. to damage, the composition is uneven, and the luminous brightness is greatly reduced. In addition, the energy consumption is large, the preparation cycle is long, and it is difficult to avoid the second phase.
The disadvantages of the sol-gel method are the use of metals, high cost, long production cycle, and no significant improvement in luminescent performance

Method used

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  • Luminescent material of aluminate, and preparation
  • Luminescent material of aluminate, and preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Sr(NO 3 ) 2 5.2906g, Al 2 o 3 2.55g, 0.095mol / l Eu(NO 3 ) 3 Solution 5.2ml, 0.095mol / l Dy(NO 3 ) 3 Solution 5.2ml, (NH 4 ) 2 CO 3 10g, H 3 BO 3 0.1545g.

[0017] 2.55gAl 2 o 3 The powder is dispersed well with HCl solution with pH=2 or so, and 5.2906g of Sr(NO 3 ) 2 Make a solution and add it, and add 5.2ml of Eu(NO 3 ) 3 solution, 5.2ml of Dy(NO 3 ) 3 solution. Put the beaker containing the mixture into a water bath at 60-80°C to heat, and at the same time, add 10g (NH 4 ) 2 CO 3 The aqueous solution was added in the beaker tube by tube, stirred while heating, and the reaction continued for two hours. Suction filter and wash the precipitate after the reaction, remove water with ethanol, repeat three times, and dry in an oven at 100° C. for 12 hours. Weigh 0.1545gH 3 BO 3 , dissolved in deionized water at 40°C, poured into an evaporating dish, added the previously dried sample, and heated while grinding until the water evaporated completely ...

Embodiment 2

[0020] Sr(NO 3 ) 2 5.2906g, Al 2 o 3 2.55g, 0.095mol / l Eu(NO 3 ) 3 Solution 5.2ml, 0.095mol / l Dy(NO 3 ) 3 Solution 5.2ml, NH 4 HCO 3 10g, H 3 BO 3 0.1545g.

[0021] 2.55gAl 2 o 3 The powder is well dispersed with HCl solution with pH=4 or so, and 5.2906g of Sr(NO 3 ) 2 Make a solution and add it, and add 5.2ml of Eu(NO 3 ) 3 solution, 5.2ml of Dy(NO 3 ) 3solution. Heat the beaker containing the mixture in a water bath at 30-50°C while adding 10g of NH 4 HCO 3 The aqueous solution was added to the beaker tube by tube, stirred while heating, and the reaction continued for three hours. Suction filter and wash the precipitate after the reaction, remove water with ethanol, repeat three times, and dry in an oven at 100° C. for 12 hours.

[0022] After drying, weigh 0.1545gH 3 BO 3 , dissolved in deionized water at 50°C, poured into an evaporating dish, added the previously dried sample, and heated while grinding until the water evaporated completely to obta...

Embodiment 3

[0024] Sr(NO 3 ) 2 4.2326g, Al 2 o 3 2.04g, 0.1598mol / l EuCl 3 Solution 2.5ml, 0.1601mol / l DyCl 3 Solution 2.5ml, (NH 4 ) 2 CO 3 8g, H 3 BO 3 0.1236g.

[0025] 2.04gAl 2 o 3 The powder is well dispersed with HCl solution with pH=5 or so, and 4.2326g of Sr(NO 3 ) 2 Make a solution and add it, and add 4.2ml of EuCl at the same time 3 solution, 4.2ml of DyCl 3 solution. Put the beaker containing the mixture into a water bath at 50-70°C to heat, and at the same time, add 8g (NH 4 ) 2 CO 3 The aqueous solution of adding in the beaker by tube, stirs while heating, and reaction continues 2.5 hours. Suction filter and wash the precipitate after the reaction, remove water with ethanol, repeat three times, and dry in an oven at 100° C. for 12 hours.

[0026] After drying, weigh 0.1545gH 3 BO 3 , dissolved in deionized water at 70°C, poured into an evaporating dish, added the previously dried sample, and heated while grinding until the water evaporated completely...

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Abstract

This invention relates to a method for prepring inorganic long-afterglow aluminate luminescent material. The method comprises: preparing nitrate or chloride solutions of Sr, Eu and Dy with deionized water, mixing with aluminum oxide solution, precipitating with (NH4)2CO3 solution, NH4HCO3 or oxalic acid to obtain precursor-coated precipitate, reducing in a weakly reductive atmosphere, and sintering in a high-temperature furnace to obtain long-afterglow aluminate luminescent powdery material M1-x-y.OmAl2O3:Eux, REy. The obtained aluminate luminescent material has such advantages as high luminescent efficiency, long afterglow, low energy consumption and short preparation period. Compared with combustion method, the method in this invention does not produce NH3 that may pollute environment. Compared with sol-gel method, the method in this invention has lwo cost, short preparation period and high luminescent performance of the product.

Description

technical field [0001] The invention relates to an inorganic long-lasting aluminate luminescent material and provides a preparation method thereof, belonging to the technical field of inorganic materials and preparation thereof. Background technique [0002] The earliest research on long-lasting luminescent materials was ZnS:Cu prepared by the Frenchman Sidot in 1866. This is the first long-lasting luminescent material with practical application significance. Over time, people have developed materials with better performance such as ZnS: Cu, Co, CaS: Bi and CaSrS: Bi. However, sulfides are chemically unstable, have poor light resistance, short afterglow time, and the addition of Co and other elements will cause harm to human health and the environment. Therefore, people began to pay attention to the use of materials with more social and economic benefits. In 1968, Palilla et al. were studying SrAl 2 o 4 : During the luminescence process of Eu, the long afterglow characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 李强徐晓
Owner EAST CHINA NORMAL UNIV
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