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Nitrogen oxide fluorescent powder with garnet structure and preparation method and application thereof

A nitrogen oxide and phosphor technology is applied in the field of nitrogen oxide phosphor with a garnet structure and its preparation, which can solve the problems of unstable luminescence color, poor chemical stability, harsh preparation conditions, etc., and achieves high display efficiency. The effect of color index, low cost and simple preparation process

Active Publication Date: 2017-05-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can make up for the YAG:Ce to a certain extent 3+ Insufficient phosphor powder, but it also brings new problems
First of all, sulfide and nitride have their own disadvantages, such as the former has poor chemical stability and is harmful to the environment, while the preparation conditions of the latter are very harsh and the cost is high; secondly, due to the difference in energy emitted between different phosphors reabsorption, making its emission color unstable

Method used

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  • Nitrogen oxide fluorescent powder with garnet structure and preparation method and application thereof
  • Nitrogen oxide fluorescent powder with garnet structure and preparation method and application thereof
  • Nitrogen oxide fluorescent powder with garnet structure and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 MgY 1.94 al 3 Si 2 o 11 N:0.06Ce 3+ Phosphor powder preparation

[0031] According to the molecular formula MgY 1.94 al 3 Si 2 o 11 N:0.06Ce 3+ Weigh 0.2016 grams of magnesium oxide (MgO), 1.0952 grams of yttrium oxide (Y 2 o 3 ), 0.7647 grams of alumina (Al 2 o 3 ), 0.1754 grams of silicon nitride (Si 3 N 4 ), 0.3755 grams of silicon dioxide (SiO 2 ), 0.0516 grams of cerium oxide (CeO 2 ), the purity of the above raw materials is above 99%, and the above raw material mixture is fully ground in an agate mortar, so that the raw materials are mixed evenly, and the obtained precursor is placed in a corundum crucible. Under the reducing atmosphere provided by activated carbon, in the atmosphere In the furnace at 10°C·min -1The temperature was raised to 900°C at a constant speed, kept at a constant temperature for 6h, and then cooled to room temperature. The calcined precursor was ground again, in activated carbon and H 2 / N 2 (5% / 95%) put it in...

Embodiment 2

[0034] According to the molecular formula Mg 0.8 Ca 0.2 Y 1.97 Al 3 Si 2 o 11 N:0.03Ce 3+ Weigh 0.1612 grams of magnesium oxide (MgO), 0.1001 grams of calcium carbonate (CaCO 3 ), 1.1121 grams of yttrium oxide (Y 2 o 3 ), 0.7647 grams of alumina (Al 2 o 3 ), 0.1754 grams of silicon nitride (Si 3 N 4 ), 0.3755 grams of silicon dioxide (SiO 2 ), 0.0258 grams of cerium oxide (CeO 2 ), the purity of the above raw materials is above 99%. Thoroughly grind the above raw material mixture in an agate mortar to make the raw materials mix evenly. The obtained precursor was placed in a corundum crucible, under the reducing atmosphere provided by activated carbon, in an atmosphere furnace at 10 °C min -1 The temperature was raised to 900°C at a constant speed, kept at a constant temperature for 6h, and then cooled to room temperature. The calcined precursor was ground again, in activated carbon and H 2 / N 2 (5% / 95%) put it into the atmosphere furnace under the reducing at...

Embodiment 3

[0037] According to the molecular formula Mg 0.8 Ca 0.2 Y 1.44 Gd 0.5 Al 3 Si 2 o 11 N:0.06Ce 3+ Weigh 0.1612 grams of magnesium oxide (MgO), 0.1001 grams of calcium carbonate (CaCO 3 ), 0.8129 grams of yttrium oxide (Y 2 o 3 ), 0.9063 grams of gadolinium oxide (Gd 2 o 3 ), 0.7647 grams of alumina (Al 2 o 3 ), 0.1754 grams of silicon nitride (Si 3 N 4 ), 0.3755 grams of silicon dioxide (SiO 2 ), 0.0516 grams of cerium oxide (CeO 2 ), the purity of the above raw materials is above 99%. Thoroughly grind the above raw material mixture in an agate mortar to make the raw materials mix evenly. The obtained precursor was placed in a corundum crucible, under the reducing atmosphere provided by activated carbon, in an atmosphere furnace at 10 °C min -1 The temperature was raised to 900°C at a constant speed, kept at a constant temperature for 6h, and then cooled to room temperature. The calcined precursor was ground again, in activated carbon and H 2 / N 2 (5% / 95%) ...

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Abstract

The invention discloses nitrogen oxide fluorescent powder with a garnet structure and a preparation method and application thereof. The chemical expression formula of the fluorescent powder is Mg(1-a)AaY(2-b-x)BbAl(3-c)CcSi(2-d)DdO11N:xCe<3+>, wherein in the formula, A is a combination of one or two of Sr and Ca according to any proportion; B is a combination of one or two of Gd, La and Lu according to any proportion; C is Ga; D is Ge; x, a, b, c and d are respective molar fractions; a is larger than or equal to 0 and less than or equal to 0.2; b is larger than or equal to 0 and less than or equal to 0.5; c is larger than or equal to 0 and less than or equal to 3; d is larger than or equal to 0 and less than or equal to 0.7; x is larger than or less equal to 0.01 and less than or equal to 0.12. The nitric oxide fluorescent powder provided by the invention is synthesized through a conventional high-temperature solid-phase reaction method, is prepared from readily-available in raw materials, is simple and convenient in preparation process, is lower than an ordinary nitrogen oxide in reaction temperature, can be synthesized from common cheap compounds under the normal pressure, is low in cost, is easy to produce in batches, and can be packaged with a blue-ray LED (Light-Emitting Diode) chip in order to obtain white light having a high color rendering index.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a fluorescent powder used in semiconductor lighting, in particular to a nitrogen oxide fluorescent powder with a garnet structure that can be effectively excited by a blue LED chip to emit orange-yellow light and its preparation method and application. Background technique [0002] Among the manufacturing methods of white light LEDs, the method of coating yellow phosphor powder on blue light InGaN chips has received the most attention because of its simplicity and the high efficiency of the obtained LED devices. Ce 3+ Ion-activated yttrium aluminum garnet (Y 3 A1 5 o 12 : Ce 3 + , referred to as YAG:Ce 3+ ) has become the most important commercially available yellow phosphor due to its high efficiency in absorbing blue light and converting it into yellow light. But since YAG:Ce 3+ There are too few red components in the emission spectrum of the ...

Claims

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Application Information

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IPC IPC(8): C09K11/80H01L33/50
CPCC09K11/0883C09K11/7774C09K11/7775H01L33/502Y02B20/00
Inventor 潘再法陈加成李伟强张露露郑遗凡
Owner ZHEJIANG UNIV OF TECH
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