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Silicate compound luminescent material and preparation method thereof

A technology of silicate compounds and luminescent materials, applied in luminescent materials, chemical instruments and methods, sustainable buildings, etc., can solve the problems of low effective conversion efficiency, unstable properties, large light decay, etc. Easy to mass-produce, good effect of anti-attenuation characteristics

Inactive Publication Date: 2011-09-07
HANGZHOU LIGHT COLOR OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the technology of using blue light, purple light or ultraviolet light LEDs with phosphors to produce white light is relatively mature, but green and red phosphors that can be applied to LEDs have low effective conversion efficiency, unstable properties, and large light attenuation.

Method used

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  • Silicate compound luminescent material and preparation method thereof
  • Silicate compound luminescent material and preparation method thereof
  • Silicate compound luminescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Ba 1.999 SiO 4 : 0.005Eu 2+ Preparation example of luminescent material

[0032] Press Ba 1.999 SiO 4 : 0.001Eu 2+ The stoichiometric ratio takes by weighing 39.369 grams of high-purity barium carbonate and 0.088 grams of europium oxide in dilute nitric acid solution to obtain a nitrate solution; dissolving 20.833 grams of tetraethyl orthosilicate in a certain amount of dehydrated alcohol to obtain a normal calculation ethyl ester solution; Under constant stirring, slowly add tetraethyl orthosilicate solution into the nitrate solution, and then add dilute ammonia water with a volume percentage of 10%, adjust the pH value to 8, and then keep stirring at a constant temperature of 80°C for 3 hours , to obtain a white transparent sol; dry the sol at 150°C to obtain a xerogel, break it into a powder, then add barium fluoride with a mass of 5% of the xerogel and perform ball milling; mix the obtained mixture in the volume of hydrogen The percentage content is...

Embodiment 2

[0034] Example 2: Sr 1.34 Ba 0.6 SiO 4 : 0.06Eu 2+ Preparation example of luminescent material

[0035] Press Sr 1.34 Ba 0.6 SiO 4 : 0.06Eu 2+ The stoichiometric ratio weighed 19.782 grams of strontium carbonate, 11.840 grams of barium carbonate and 0.088 europium oxide in dilute nitric acid solution to obtain a nitrate solution; ester solution; under continuous stirring, slowly add tetraethyl orthosilicate solution into the nitrate solution, and then add dilute ammonia water with a volume percentage of 10% to the above solution, adjust the pH value to 9, and then Stir continuously at a constant temperature for 5 hours to obtain a white transparent sol; dry the sol at 200°C to obtain a xerogel, and after the xerogel is broken into powder, add barium fluoride and 1 % boric acid and mixed by ball milling; the mixture was sintered in a nitrogen-hydrogen mixture in a nitrogen-hydrogen reducing atmosphere (in a nitrogen-hydrogen reducing atmosphere, the volume percentage of...

Embodiment 3

[0037] Example 3: Sr1.7 Ca 0.1 Mg 0.05 SiO 4 : 0.15Eu 2+ Preparation example of luminescent material

[0038] Press Sr 1.7 Ca 0.1 Mg 0.05 SiO 4 : 0.15Eu 2+ The stoichiometric ratio takes 35.977 grams of strontium nitrate, 2.361 grams of calcium nitrate tetrahydrate, 0.202 grams of magnesium oxide and 2.639 grams of europium oxide in dilute nitric acid solution to obtain a nitrate solution; dissolve 20.833 grams of ethyl orthosilicate in a certain amount of Ethyl orthosilicate solution was obtained in water and ethanol; under continuous stirring, slowly add ethyl orthosilicate solution into the nitrate solution, and then add dilute ammonia water with a volume percentage of 10% to the above solution to adjust the pH value Adjust it to 10, and then keep stirring at a constant temperature of 70°C for 4 hours to obtain a white transparent sol; dry the sol at 250°C to obtain a xerogel, and after the xerogel is broken into powder, the added mass is the mass of the xerogel 0....

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Abstract

The invention relates to a silicate compound luminescent material and a preparation method thereof, belonging to the fields of preparation and applications of the silicate compound. After the luminescent material is excited by the excitation light sources, such as ultraviolet or blue light and the like, the emission wavelength is 51-620nm; the formula is M(2-x+y)SiO(4+y): xEu2<+>, wherein, M is one or more of alkaline-earth metals; and x is more than or equal to 0.001 and is less than or equal to 0.5, and y is more than or equal to 0 and is less than or equal to 1. The luminescent material provided by the invention has the characteristics of wide excitation and emission wavelength ranges, high efficiency and high stability and the like. The preparation method is simple, is easy to control granularities and surface appearances of products, and is easy to industrialize. The luminescent material provided by the invention is utilized to be matched with other luminescent materials, ultraviolet, near ultraviolet or a light blue LED (light-emitting diode), a new-type white light LED light source can be prepared, thus the color rendering properties of the light source are increased; and the new-type white light LED light source can be widely applied to illuminate and display backlight sources.

Description

technical field [0001] The invention relates to a silicate compound luminescent material used in display screens, liquid crystal backlights, white light emitting diodes, red light emitting diodes, fluorescent lamps and the like and a preparation method thereof. Background technique [0002] In the field of lighting technology, solid-state lighting, especially white lighting using semiconductor light-emitting diodes (LEDs), has been expected, and extensive research and development has been going on. As an emerging illuminant, semiconductor lighting has the advantages of high electro-optical efficiency, small size, long life, low voltage, energy saving and environmental protection, and is the best choice for the next generation of lighting. At present, the mixture of cerium-activated yttrium aluminum garnet (YAG) fluorescent material and epoxy resin is mainly coated on the blue LED to generate white light through the principle of complementary color. However, because the ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
CPCY02B20/181Y02B20/00
Inventor 支波周炯
Owner HANGZHOU LIGHT COLOR OPTOELECTRONICS TECH
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