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Phosphor, method for producing same, phosphor-containing composition, light-emitting device, image display, and illuminating device

A technology of a light-emitting device and a manufacturing method, applied in the field of phosphors, can solve the problems of low luminance, low conversion efficiency of blue light or near-ultraviolet light, and narrow range of phosphor color reproduction.

Inactive Publication Date: 2009-03-04
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These phosphors have a narrow color reproduction range and low luminance, which is not satisfactory for the above purpose
[0009] In addition, Patent Document 1 describes that the wavelength can be changed by changing the composition of Ba, Sr, and Ca. However, the phosphors produced with the composition and production method described in the examples all have the ability to convert blue light or near-ultraviolet light. Low efficiency, unsatisfactory in terms of both color reproduction range and luminance

Method used

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  • Phosphor, method for producing same, phosphor-containing composition, light-emitting device, image display, and illuminating device
  • Phosphor, method for producing same, phosphor-containing composition, light-emitting device, image display, and illuminating device
  • Phosphor, method for producing same, phosphor-containing composition, light-emitting device, image display, and illuminating device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6 and comparative example 1～8

[0659] As a phosphor raw material, barium carbonate (BaCO 3 ), strontium carbonate (SrCO 3 ), europium oxide (Eu 2 o 3 ), silicon dioxide (SiO 2 ) of the respective powders. These phosphor raw materials are all used with a purity of 99.9% or more and a weight median diameter D 50 It is a powder of 10nm to 5μm. These phosphor raw materials were weighed, and the ratio of each element was set to the molar ratio shown in Examples 1-6 and Comparative Examples 1-8 in Table 3 below. The powders of these phosphor raw materials were mixed until sufficiently homogeneous with an automatic mortar, filled into an alumina crucible, and fired at 1000° C. for 12 hours under atmospheric pressure in air. Next, the contents of the crucible were taken out, and SrCl was added at the molar ratios shown in Examples 1 to 6 and Comparative Examples 1 to 8 in Table 3 below. 2 or NH 4 Cl is used as a flux, and then mixed and pulverized with a dry ball mill. The obtained mixed pulverized product...

Embodiment 7

[0705] Make the structure with the above figure 2 The color reproduction range of the same light-emitting device as shown in (b) was evaluated based on the NTSC ratio. The fabrication of the light-emitting device is carried out in the following steps.

[0706] In addition, among the constituent elements of the light-emitting devices produced in the following examples and comparative examples, descriptions and figure 2 (b) For the corresponding constituent elements, the symbols are indicated in parentheses as appropriate.

[0707] As the first illuminant ( 22 ), a blue light-emitting diode (hereinafter simply referred to as "blue LED" for convenience) that emits light with a wavelength of 450 nm to 470 nm, that is, ES-CEBL912 of Epistar Corporation was used. The blue LED (22) is chip bonded to the terminal at the bottom of the recess of the frame (24) using silver paste as an adhesive. At this time, silver paste as a binder is thinly and uniformly applied in consideration of...

Embodiment 8

[0711] As in Example 7, where Ca, which is a phosphor emitting light with a wavelength of about 560nm to 750nm, is used 0.998 Eu 0.08 AlSiN 3 (This phosphor is sometimes referred to as "phosphor (C)") Instead of phosphor (B), the weight ratio of phosphor (A) to phosphor (C) is set to 88:12. The same steps as in Example 7 were used to fabricate a light-emitting device.

[0712] The obtained light-emitting device was made to emit light under the same conditions as in Example 7, and the white chromaticity coordinates thereof were measured, and the result was x / y=0.31 / 0.33. In addition, as an indicator of the color reproduction range, the NTSC ratio was measured according to the method described in the above item [3. Light-emitting device]. The obtained NTSC ratios are shown in Table 8 described later.

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Abstract

Disclosed is a high-performance phosphor producing green fluorescence which is excellent in color purity and conversion efficiency for blue light or near ultraviolet light. Specifically disclosed is a phosphor satisfying the following conditions (i)-(v). (i) The emission peak wavelength is not less than 510 nm but not more than 542 nm when excited by light having a peak wavelength of 400 nm or 455 nm. (ii) The emission peak half-width is not more than 75 nm when excited by light having a peak wavelength of 400 nm or 455 nm. (iii) The external quantum efficiency defined by the formula below is not less than 0.42 when excited by light having a peak wavelength of 400 nm or 455 nm. (External Quantum Efficiency) = (Internal Quantum Efficiency) (Absorption Efficiency) (iv) At least a part of the surface of the phosphor is composed of a material containing oxygen. (v) The phosphor contains a metal element which can be divalent or trivalent (hereinafter referred to as 'M<II> element'), and the ratio of the mole number of the M<II> element with respect to the total mole number of divalent elements contained in the phosphor is more than 1% but less than 15%.

Description

technical field [0001] The present invention relates to a phosphor emitting green fluorescence, a method for producing the phosphor, a phosphor-containing composition and a light-emitting device using the phosphor, and an image display device and a lighting device using the light-emitting device. More specifically, the present invention relates to a green phosphor suitable for a backlight for liquid crystals, a phosphor-containing composition and a light-emitting device using the green phosphor, and an image display device and lighting device using the light-emitting device. Background technique [0002] White light required for lighting and display applications is usually obtained by combining blue, green, and red light emissions based on the principle of additive mixing of light. In one field of display applications—backlight light sources for color liquid crystal display devices, in order to effectively reproduce a wide range of colors on the chromaticity coordinates, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59C09K11/08H01L33/00H01J61/44H01L33/50H01L33/56
CPCH01L2224/45015H01L2224/45124H01L24/45H01L2224/45144H01L33/502H01L2924/01066H01L2924/01067H01L2924/01021H01L2224/48091H01L2924/01055H01L2224/48247H01L2924/01037H01L2924/01019C09K11/7734H01L2924/01068H01L2924/12042H01L2924/12044H01L2924/12041H01L2924/181C09K11/77342C09K11/77348H01L2924/00014H01L2924/20753H01L2924/20752H01L2924/00H01L2924/00012C09K11/77
Inventor 吉野正彦三浦千里木岛直人小室直之
Owner MITSUBISHI RAYON CO LTD
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