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Phosphor and method for manufacturing the same, and light-emitting device and display device using phosphor

A manufacturing method and a technology of a light-emitting device, which are applied in the field of phosphors, can solve the problems of reduced luminous intensity, low color rendering, and inability to obtain brightness, and achieve the effect of improving color rendering

Active Publication Date: 2013-01-02
DEXERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] White LEDs obtained by combining blue LEDs with yellow phosphors have the problem of low color rendering in the red region due to lack of red emission
In the case of less than 0.001 atomic percent, the luminous intensity decreases and sufficient luminance cannot be obtained

Method used

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  • Phosphor and method for manufacturing the same, and light-emitting device and display device using phosphor
  • Phosphor and method for manufacturing the same, and light-emitting device and display device using phosphor
  • Phosphor and method for manufacturing the same, and light-emitting device and display device using phosphor

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Embodiment approach

[0077] The phosphor according to the embodiment of the present invention is excited by light in the blue light wavelength range of 400 to 480 nm, has an emission center wavelength of 600 nm or more, and includes (Sr 1-x , Ba x ) 3 SiO 5 where 1>x≥0.1 and Eu as the activator. Preferably, x≧0.2, more preferably 0.8≧x, more preferably 0.5≧x. In the case of 0.5≥x≥0.1, (Sr 1-x , Ba x ) 3 SiO 5 : The fluorescence intensity of Eu phosphor is that of yellow YAG phosphor (Y 1.5 , Gd 1.5 )(Al 2 , Ga 3 )O 12 : about 1.07 to about 1.20 times the fluorescence intensity of Ce.

[0078] Phosphors according to embodiments of the present invention can be suitably used in light-emitting devices and display devices. In particular, phosphors can be suitably used in display devices (such as liquid crystal display devices) using light emitting devices (such as white LEDs).

[0079] In the following description, including (Sr 1-x , Ba x ) 3 SiO 5 (1>x≥0.1) and the phosphor of Eu as...

Embodiment

[0087] figure 1 is shown in the embodiment of the present invention (Sr 1-x , Ba x ) 3 SiO 5 : Graphs of fluorescence spectra of Eu phosphors (substrate composition x=0.0, 0.25, 0.5, 0.75 and 1.0).

[0088] exist figure 1 In , the abscissa represents the wavelength (nm) and the ordinate represents the relative fluorescence intensity. In this graph, (a) is Ba 3 SiO 5 : Fluorescence spectrum of Eu phosphor (x=1.0), (b) is (Sr 0.25 , Ba 0.75 ) 3 SiO 5 : Fluorescence spectrum of Eu phosphor (x=0.75), (c) is (Sr 0.5 , Ba 0.5 ) 3 SiO 5 : Fluorescence spectrum of Eu phosphor (x=0.5), (d) is (Sr 0.75 , Ba 0.25 ) 3 SiO 5 : Fluorescence spectrum of Eu phosphor (x=0.25), (e) is Sr 3 SiO 5 : fluorescence spectrum of Eu phosphor (x=0.0), and (f) is the fluorescence spectrum of yellow YAG phosphor.

[0089] A yellow YAG phosphor is commercially available (Y, Gd) in which the ratios of elements constituting its base material are Y:Gd=1:1 and Al:Ga=2:3 3 (Al, Ga) 5 o ...

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Abstract

A phosphor includes (Sr 1-x , Ba x ) 3 SiO 5 with 1 > x ‰¥ 0.1 as a base material and europium (Eu) as an activator. The emission center wavelength of the phosphor is controlled to be 600 nm or more on the basis of the composition ratio of Sr, Ba, and Eu.

Description

[0001] References to related applications [0002] The present invention contains subject matter related to that disclosed in Japanese Priority Patent Application JP 2008-132705 filed in the Japan Patent Office on May 21, 2008, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to a phosphor, and in particular to a phosphor comprising (Sr 1-x , Ba x ) 3 SiO 5 A phosphor emitting orange fluorescence with europium (Eu) as an activator, a method for producing the phosphor, and a light emitting device and a display device using the phosphor. Background technique [0004] In recent years, blue light emitting diodes (LEDs) mainly composed of gallium nitride that can efficiently emit light in the blue wavelength range have been developed and widely used. White light-emitting devices (white LEDs) have been developed by combining such blue LEDs with yellow phosphors that emit yellow fluorescence upon excitation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59H01L33/00C09K11/08H01L33/32H01L33/48H01L33/50H01L33/56H01L33/60
CPCC09K11/7734H01L2224/48091C09K11/77342H01L2924/00014C09K11/59C09K11/77
Inventor 五十岚崇裕楠木常夫
Owner DEXERIALS CORP