Invention Grant
- Patent Title: White light emitting device with red and green-yellow phosphor
- Patent Title (中): 白色发光装置，红色和绿色黄色荧光粉
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Application No.: US13644440Application Date: 2012-10-04
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Publication No.: US08907558B2Publication Date: 2014-12-09
- Inventor: Ryosuke Hiramatsu , Kunio Ishida
- Applicant: Ryosuke Hiramatsu , Kunio Ishida
- Applicant Address: JP Tokyo
- Assignee: Kabushiki Kaisha Toshiba
- Current Assignee: Kabushiki Kaisha Toshiba
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2012-058152 20120315
- Main IPC: H01L33/50
- IPC: H01L33/50
Abstract:
A white light emitting device includes a light emitting element having a peak wavelength at from 430 nm to 460 nm; and a fluorescent layer on the light emitting element containing a red fluorescent material and a green-yellow fluorescent material. The white light emitting device achieves high color rendering properties, a high average color rendering index Ra and a high luminescent efficiency, or a high white efficiency.
Public/Granted literature
- US20130241396A1 WHITE LIGHT EMITTING DEVICE Public/Granted day:2013-09-19
Information query
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