Nitrogenous silicate yellow green luminescent material for white light LED (light-emitting diode) and preparation thereof

A technology of luminescent materials and silicates, applied in luminescent materials, chemical instruments and methods, etc., can solve problems such as inconvenience and insecurity, and achieve the effects of improved luminescent performance, simple preparation method and high luminous intensity

Inactive Publication Date: 2013-12-18
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are neither convenient nor safe

Method used

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  • Nitrogenous silicate yellow green luminescent material for white light LED (light-emitting diode) and preparation thereof
  • Nitrogenous silicate yellow green luminescent material for white light LED (light-emitting diode) and preparation thereof
  • Nitrogenous silicate yellow green luminescent material for white light LED (light-emitting diode) and preparation thereof

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Embodiment 1

[0023] Example 1 Calcium nitrate (CaN) was weighed according to the molar ratio of Ca:Si:Eu of 1.96:2:0.4 2 O 6 ·4H 2 O), Ethyl orthosilicate (C 8 H 20 O 4 Si) and Europium Nitrate (EuN 3 O 9 ·6H 2 O). First, dissolve calcium nitrate and europium nitrate in a mixture of absolute ethanol and water with a volume ratio of 3:1, stir until the calcium nitrate and europium nitrate are uniformly dissolved, and then adjust the pH of the solution to 2. Add the weighed ethyl orthosilicate into the prepared solution, stir for 2 hours to obtain a clear sol, heat the sol in a water bath at 60°C for 4 hours to obtain a dry colloid, and put the dry gel in a drying box It was dried at 120°C for 12 hours to obtain a precursor. The precursor is ground and calcined in a resistance furnace at 1100°C for 2 hours to obtain Ca 2 SiO 4 :Eu 3+ product. In molar ratio Ca2SiO4: Eu 3+ :Si 3 N 4 Weigh Ca in a ratio of 1:1 2 SiO 4 :Eu 3+ And Si 3 N 4 , Will Ca 2 SiO 4 :Eu 3+ And Si 3 N 4 Mix evenly and put...

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Abstract

The invention relates to a novel divalent europium doped nitrogenous silicate solid solution base luminescent material and a self reduction preparation method. The chemical composition of the luminescent material is shown as follows: Ca3Si3 (O9-xNx):Eu<2+>. The preparation method comprises two steps of (1) preparing a Ca2SiO4:Eu<3+> product through a sol-gel method; (2) roasting the Ca2SiO4:Eu<3+> product and a silicon nitride mixture in a non reducing atmosphere, thus obtaining the final product by the self reducing action of the Si3N4, wherein the used materials comprise calcium nitrate (CaN2O6.4H2O), europium nitrate (EuN3O9.6H2O), ethyl orthosilicate (C8H20O4Si), and Si3N4. The luminescent material has broad band (300-450nm) to absorb near ultraviolet and blue light and gives out yellow green light (534-544nm). The obtained product has high light intensity and has stable properties. The preparation process can be finished only in protection atmosphere of nitrogen and needs no other reduction atmosphere and other reduction methods, so that the preparation method is simple and safe.

Description

Technical field [0001] The invention belongs to the field of rare earth luminescent materials. In particular, it relates to a novel divalent europium-doped nitrogen-containing silicate solid solution-based yellow-green luminescent material for white light LEDs and a self-reducing preparation method thereof. Background technique [0002] LED is considered to be a new type of high-efficiency light source in the 21st century, with the characteristics of long life, high luminous efficiency, environmental protection and energy saving. It has been widely used in urban lighting, electronic communication equipment, automotive and other lighting fields. Among them, white LED lighting accounts for about 50% of the entire LED. The development of LED light sources is of great significance to energy-saving and environmentally friendly green energy. [0003] At present, the way to realize white light LED is mainly obtained by phosphor conversion method. The common method is to obtain white li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
Inventor 黄维刚齐智坚
Owner SICHUAN UNIV
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