Invention Grant
- Patent Title: Light-emitting device
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Application No.: US13542051Application Date: 2012-07-05
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Publication No.: US08362685B2Publication Date: 2013-01-29
- Inventor: Masatsugu Masuda , Kenji Terashima
- Applicant: Masatsugu Masuda , Kenji Terashima
- Applicant Address: JP Osaka-shi, Osaka
- Assignee: Sharp Kabushiki Kaisha
- Current Assignee: Sharp Kabushiki Kaisha
- Current Assignee Address: JP Osaka-shi, Osaka
- Agency: Nixon & Vanderhye, P.C.
- Priority: JP2008-052210 20080303
- Main IPC: H01J1/62
- IPC: H01J1/62 ; H01J63/04 ; C09K11/08

Abstract:
Disclosed is a light-emitting device (1) including a light-emitting element (2) emitting primary light, and a light converter (3) absorbing a part of the primary light emitted from the light-emitting element (2) and emitting secondary light having a longer wavelength than the primary light. The light converter (3) contains a green light-emitting phosphor (4) and a red light-emitting phosphor (5). The green light-emitting phosphor (4) is composed of at least one phosphor selected from a divalent europium-activated oxynitride phosphor substantially represented by the following formula: EuaSibAlcOdNe and a divalent europium-activated silicate phosphor substantially represented by the following formula: 2(Ba1-f-gMIfEug)O.SiO2, while the red light-emitting phosphor (5) is composed of at least one phosphor selected from tetravalent manganese-activated fluoro-tetravalent metalate phosphors substantially represented by the following formulae: MII2(MIII1-hMnh)F6 and/or MIV(MIII1-hMnh)F6. Consequently, the light-emitting device (1) has excellent color gamut (NTSC ratio).
Public/Granted literature
- US20120267669A1 LIGHT-EMITTING DEVICE Public/Granted day:2012-10-25
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