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Blue-green light emitting scandium silicate fluorescent ceramic and preparation method thereof

A scandium silicate and fluorescent ceramic technology is applied in the field of scandium silicate fluorescent ceramics and their preparation, which can solve the problems of low luminous efficiency, low transmittance, low density of fluorescent ceramics, etc. The effect of good stability, quantum efficiency and excellent temperature characteristics

Inactive Publication Date: 2020-01-10
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a blue-green light-emitting scandium silicate fluorescent ceramic and its preparation method in order to solve the problems of low density, low transmittance and low luminous efficiency of the existing fluorescent ceramics

Method used

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  • Blue-green light emitting scandium silicate fluorescent ceramic and preparation method thereof
  • Blue-green light emitting scandium silicate fluorescent ceramic and preparation method thereof
  • Blue-green light emitting scandium silicate fluorescent ceramic and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Ca 2.9395 Ce 0.0005 Y 0.06 sc 2 Si 3 o 12 preparation of

[0049] Weigh Ca(NO 3 ) 2 .4H 2 O: 34.7081 grams, Ce(NO 3 ) 3 .6H 2 O: 0.0109 grams, Y (NO 3 ) 3 .6H 2 O: 1.1492 g, Sc(NO 3 ) 3 : 23.097 grams, the above-mentioned materials are dissolved in deionized water, and fully stirred until completely dissolved; measure TEOS: 33.5ml is dissolved in absolute ethanol, then, the above-mentioned two kinds of solutions are mixed and fully stirred to obtain a mixed solution;

[0050] Then the obtained mixed solution was slowly dried at 60° C. until a transparent gel was obtained, and further dried at 110° C. to obtain a dry gel.

[0051] Put the obtained xerogel into a high-temperature furnace and anneal at 600° C. for 5 hours to remove acid groups and organic matter, thereby obtaining a loose precursor powder.

[0052] Subsequently, the precursor powder was firstly dry-pressed in an axial unidirectional pressure mold with a pressure of 16MPa and a dwell time o...

Embodiment 2

[0057] Ca 2.995 Ce 0.005 sc 1.94 Zr 0.05 f 0.01 Si 3 o 12 preparation of

[0058] Weigh Ca(NO 3 ) 2 .4H 2 O: 35.3635 grams, Ce(NO 3 ) 3 .6H 2 O: 0.1085, Sc(NO 3 ) 3 : 22.4041 g, Zr(NO 3 ) 4 .5H 2 O: 1.0733 g, HfCl 4 : 0.1602g, urea: 15.015g, TEOS: 31.2495g. Dissolve the above materials in deionized water and stir until completely dissolved; measure 33.5ml of TEOS and dissolve in absolute ethanol. Then, the above two solutions are mixed and fully stirred to obtain a mixed solution;

[0059] The resulting mixed solution was dried slowly at 70°C until a transparent gel was obtained, and further dried at 90°C to obtain a xerogel.

[0060] Put the obtained xerogel into a high-temperature furnace and anneal at 800° C. for 8 hours to remove acid groups and organic matter, thereby obtaining a loose precursor powder.

[0061] The sieved precursor powder was first dry-pressed in an axial unidirectional pressure mold, and then pressed into a green body by cold isostati...

Embodiment 3

[0066] Ca 2.99 Ce 0.01 sc 2 Si 2.94 Al 0.06 o 12 preparation of

[0067] Weigh Ca(NO 3 ) 2 .4H 2 O: 35.3044 grams, Ce(NO 3 ) 3 .6H 2 O: 0.2171 g, Sc(NO 3 ) 3 : 23.097 grams, TEOS: 30.6245 grams, Al(NO 3 ) 3 .9H 2 O: 1.1254 grams, anhydrous citric acid: 48.0325g, dissolve each material in deionized water, and fully stir until completely dissolved; measure (TEOS: 32.8ml and dissolve in absolute ethanol. Then, the above two solutions Mix and stir thoroughly to obtain a mixed solution;

[0068] The resulting mixed solution was slowly dried at 80°C until a transparent gel was obtained, and further dried at 120°C to obtain a xerogel.

[0069] Put the obtained xerogel into a high-temperature furnace and anneal at 1000°C for 3 hours to remove acid groups and organic matter, thereby obtaining a loose precursor powder.

[0070] The sieved precursor powder is first dry-pressed in an axial one-way pressurized mold with a pressure of 20MPa and a holding time of 2min, and ...

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Abstract

The invention provides a blue-green light emitting scandium silicate fluorescent ceramic and a preparation method thereof, belonging to the technical field of luminescent materials. The fluorescent ceramic has a chemical formula shown as a formula (I): (Ca < 3-x-y > Ce < x > R < y >) (Sc < 2-z > L < z >) (Si < 3-m > K < m >) O < 12 >, wherein R is one or more of elements Y, Gd, La, Lu, Tb, Li andNa; wherein L is one or more of elements Zr, Hf and Mg, K is one or two of elements Al and P, x is larger than or equal to 0.0005 and smaller than or equal to 0.06, y is larger than or equal to 0 andsmaller than or equal to 0.06, z is larger than or equal to 0 and smaller than or equal to 0.06, m is larger than or equal to 0 and smaller than or equal to 0.06, and y, z and m are not zero simultaneously. The invention provides the preparation method of the blue-green light emitting scandium silicate fluorescent ceramic. The ceramic disclosed by the invention is high in luminous efficiency, stable in physical and chemical properties and adjustable in transmittance, and can be used for preparing high-power and high-brightness monochromatic green-light LEDs and white-light LEDs.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a scandium silicate fluorescent ceramic emitting blue-green light and a preparation method thereof. Background technique [0002] White LED is expected to dominate the next generation of solid-state lighting due to its advantages of all-solid-state, small size, long life, high efficiency, and environmental protection. With the development of white LEDs, people have higher and higher requirements for the quality of lighting sources. High-quality LEDs with balanced spectral components have become the goal pursued by people. High-end lighting such as high-power projection displays has become more and more popular. The current commercial white LED is coated with yttrium aluminum pomegranate Y on the blue GaN-based LED chip. 3 Al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) yellow phosphor powder, using the blue light from the LED to mix with the yellow light from the phosphor powde...

Claims

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Application Information

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IPC IPC(8): C04B35/22C09K11/77
CPCC04B35/22C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/9646C09K11/7766Y02B20/00
Inventor 武华君郝振东张家骅张霞肖文戈潘国徽张亮亮吴昊
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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