Invention Application
- Patent Title: LIGHT EMITTING DEVICE
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Application No.: US13033917Application Date: 2011-02-24
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Publication No.: US20120057338A1Publication Date: 2012-03-08
- Inventor: Iwao Mitsuishi , Yumi Fukuda , Aoi Okada , Ryosuke Hiramatsu , Naotoshi Matsuda , Shinya Nunoue
- Applicant: Iwao Mitsuishi , Yumi Fukuda , Aoi Okada , Ryosuke Hiramatsu , Naotoshi Matsuda , Shinya Nunoue
- Applicant Address: JP Tokyo
- Assignee: KABUSHIKI KAISHA TOSHIBA
- Current Assignee: KABUSHIKI KAISHA TOSHIBA
- Current Assignee Address: JP Tokyo
- Priority: JP2010-198630 20100906
- Main IPC: F21V9/16
- IPC: F21V9/16

Abstract:
A light emitting device according to one embodiment includes a board; plural first light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; plural second light emitting elements mounted on the board to emit light having a wavelength of 250 nm to 500 nm; a first fluorescent layer formed on each of the first light emitting elements, the first fluorescent layer including a first phosphor; and a second fluorescent layer formed on each of the second light emitting elements, the second fluorescent layer including a second phosphor. The second phosphor is higher than the first phosphor in luminous efficiency at 50° C., and is lower than the first phosphor in the luminous efficiency at 150° C.
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