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Blue/green fluorescent powder suitable for ultraviolet light/near ultraviolet light excitated white LED and preparation method for blue/green fluorescent powder

A technology of green fluorescent powder and near-ultraviolet light, which can be used in chemical instruments and methods, luminescent materials, sustainable buildings, etc., and can solve problems such as low color rendering index, high color temperature of white light, and poor thermal characteristics.

Inactive Publication Date: 2015-12-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the technical problems in the prior art that blue light LEDs are combined with YAG yellow phosphor powders to realize white light LEDs using YAG phosphor powders due to the lack of red light components, resulting in high color temperature of white light, low color rendering index, and poor thermal characteristics. , providing a blue / green phosphor suitable for ultraviolet / near ultraviolet light excitation for white LEDs and a preparation method thereof

Method used

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  • Blue/green fluorescent powder suitable for ultraviolet light/near ultraviolet light excitated white LED and preparation method for blue/green fluorescent powder
  • Blue/green fluorescent powder suitable for ultraviolet light/near ultraviolet light excitated white LED and preparation method for blue/green fluorescent powder
  • Blue/green fluorescent powder suitable for ultraviolet light/near ultraviolet light excitated white LED and preparation method for blue/green fluorescent powder

Examples

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Embodiment 1

[0020] Material selection according to the chemical formula Ca 1.60 Sr 0.35 SiO 4 : Ce 0.05 , weigh the analytically pure CaCO according to its molar percentage 3 , SrCO 3 , SiO 2 and high-purity CeO 2 (99.99%), after adding an appropriate amount of ethanol to fully grind, dry and grind for one minute, put it into a crucible at 1250 ° C in a reducing atmosphere H 2 / N 2 (20% / 80%) and sinter for 8 hours, take it out after cooling, and get the final product after grinding.

Embodiment 2

[0022] Material selection according to the chemical formula Ca 1.60 Sr 0.35 Si 0.7 o 4 : Ce 0.05 / 0.30Al, weigh the analytically pure CaCO according to its molar percentage 3 , SrCO 3 , SiO 2 , Al(OH) 3 and high-purity CeO 2 (99.99%), after adding an appropriate amount of ethanol to fully grind, dry and grind for one minute, put it into a crucible at 1250 ° C in a reducing atmosphere H 2 / N 2 (20% / 80%) and sinter for 8 hours, take it out after cooling, and get the final product after grinding.

Embodiment 3

[0024] Material selection according to the chemical formula Ca 1.60 Sr 0.35 Si 0.7 o 4 : Ce 0.05 / 0.30Ga, weigh the analytically pure CaCO according to its molar percentage 3 , SrCO 3 , SiO 2 , Ga 2 o 3 and high-purity CeO 2 (99.99%), after adding an appropriate amount of ethanol to fully grind, dry and grind for one minute, put it into a crucible at 1250 ° C in a reducing atmosphere H 2 / N 2 (20% / 80%) and sinter for 8 hours, take it out after cooling, and get the final product after grinding.

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Abstract

The invention relates to blue / green fluorescent powder suitable for an ultraviolet light / near ultraviolet light excitated white LED and a preparation method for the blue / green fluorescent powder and belongs to the field of light emitting materials. The blue / green fluorescent powder solves the technical problems that the white light color temperature is on the high side, the color rendering index is low and the thermal characteristic is poor as the existing YAG fluorescent powder for realizing the white light LED is short of red light components. The chemical composition of the blue / green fluorescent powder is as follows: Ca(1.65-y)Sr(0.35-x)Si(1-z)O4: Eux, Cey / Lz, wherein x is 0.001-0.08, y is 0.001-0.15, z is 0-0.5, and L is one or more of Al, Ga and B. The invention further provides the preparation method for the material. The blue / green fluorescent powder excitated at 365 nm has broadband transmission without L doping, wherein the emitting peaks are positioned at 436 nm and 508 nm. The positions and full width at half maximum(FWHM) of the emitting peaks of the blue fluorescent powder are increased as the content of L is increased. The emitting intensity is enhanced in some L doping conditions. The FWHM of the green fluorescent powder is about 87 nm. The product has certain promotional value for preparing a light emitting material for an efficient white light LED with potential applicability.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a blue / green fluorescent powder for white LEDs suitable for excitation by ultraviolet / near ultraviolet light and a preparation method thereof. Background technique [0002] White light-emitting diode (LED), as a new type of solid-state lighting technology, has the advantages of energy saving due to its high luminous efficiency, long service life, and environmental friendliness. This technology will gradually replace incandescent lamps that consume more energy And fluorescent lamps polluted by mercury, so many countries and regions have formulated corresponding measures and countermeasures to develop white LEDs. At present, there are three main ways to realize white LEDs. One is to combine red, green and blue LEDs, and the other is to use blue LEDs to combine yellow phosphors (Y 3 al 5 o 12 , YAG), and the third is to use ultraviolet and near ultraviolet LEDs to combine red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
CPCY02B20/00
Inventor 林君李凯
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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