Blue irradiance fluorophor

A phosphor, blue technology, applied in the field of blue light-emitting phosphors, to achieve the effect of high luminous brightness

Inactive Publication Date: 2009-02-11
UBE CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this patent document 2, as specific examples of phosphors, divalent Eu-activated aluminate phosphors, divalent Eu- and Mn-activated aluminate phosphors, and divalent Eu-activated halophosphate phosphors are described. Equal blue to blue-green light-emitting phosphors, trivalent Tb-activated aluminosilicate phosphate phosphors, trivalent Tb-activated boric acid,

Method used

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Examples

Experimental program
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Embodiment 1

According to the molar ratio of Ca:Eu:Mg:Si of 0.98:0.02:1:2.00, weigh calcium carbonate powder (purity: 99.99% by mass, average particle size measured by laser diffraction scattering method: 3.87μm), europium oxide Powder (purity: 99.9% by mass, average particle size measured by laser diffraction scattering method: 2.71 μm), magnesium oxide powder (manufactured by gas phase oxidation reaction method, purity: 99.99% by mass, average particle size converted from BET specific surface area: 0.05 μm), and silica (purity: 99.9% by mass, average particle size measured by laser diffraction scattering method: 3.87 μm), wet-mixed in an ethanol medium using a ball mill for 24 hours. The obtained powder mixture is dried to evaporate ethanol. The dried powder mixture was put into an alumina crucible, and sintered at a temperature of 1050° C. for 3 hours in a mixed atmosphere of 2 vol% hydrogen-98 vol% argon.

[0027] The obtained powder sintered product was washed with a 0.1 mol / L hydrochloric...

Embodiment 2

Except that the addition amount of aluminum nitrate nonahydrate relative to 1g of blue light-emitting phosphor is converted into an amount of 0.150g (15.0 parts by mass relative to 100 parts by mass of blue light-emitting phosphor particles) of alumina, the same as in the examples In the same manner as in 1, a blue light-emitting phosphor provided with an aluminum oxide film was obtained. The resulting blue light-emitting phosphor provided with an aluminum oxide film was analyzed for aluminum element distribution in the same manner as in Example 1. As a result, aluminum was uniformly detected from the surface of the phosphor particles, and the phosphor particles were confirmed to have The surface is covered by a uniform aluminum oxide film. In the same manner as in Example 1, the emission spectrum (excitation wavelength: 254 nm) of the blue light-emitting phosphor provided with this alumina coating was measured. The maximum emission intensity value of the obtained emission spectrum...

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Abstract

The invention relates to blue light emitting fluophor. The invention a CMS:Eu2+ blue light emitting fluophor which is not difficult to cause reduce of light emitting brightness by attachment of elements such as mercury in a condition that the invention is used for a cold cathode fluorescence lamp using mercury gas in discharge gas. The blue light emitting fluophor is formed by the blue light emitting fluophor particle with basic formation represented by CaMgSi2O6:E2+ covered by a capsule comprising alumina oxide in a mass part scale of 4 to 18 related to 100 mass parts of the blue light emitting fluophor particles.

Description

Technical field [0001] The present invention relates to a blue light emitting phosphor useful as a cold cathode fluorescent lamp, particularly as a blue light emitting material for a cold cathode fluorescent lamp using mercury gas in the discharge gas. Background technique [0002] Cold cathode fluorescent lamps are widely used as backlight light sources of liquid crystal display devices. The cold cathode fluorescent lamp used for such a purpose generally includes a glass tube having a phosphor layer including a phosphor that is excited by ultraviolet rays or vacuum ultraviolet rays to emit visible light on the inner wall, electrodes provided on both ends of the glass tube, and enclosed in Discharge gas in the glass tube. As a discharge gas, mercury gas is widely used. [0003] As a blue luminescent material for cold cathode fluorescent lamps, BaMgAl is known 10 O 17 :Eu 2+ Or BaMg 2 Al 16 O 27 :Eu 2+ Barium·magnesium·aluminum oxide phosphors waiting for Eu activation. Since the ...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/79H01J61/35
CPCH01J61/44C09K11/77342C09K11/7731C09K11/641
Inventor 稻垣彻出光隆植木明
Owner UBE CHEM IND CO LTD
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