Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
2005-06-07
2010-06-01
Won, Bumsuk (Department: 2889)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S498000, C313S501000, C313S506000
Reexamination Certificate
active
07728508
ABSTRACT:
A light-emitting device can be configured to have little variation in light emission characteristics even at increased temperatures. A light-emitting device can include a light-emitting section for emitting light with a predetermined wavelength, and a fluorescent material for absorbing a part of light emitted from the light-emitting section and emitting light with a longer wavelength. The light-emitting device can mix the light with the predetermined wavelength from the light-emitting section and the light with the longer wavelength from the fluorescent material, and thereby emit a mixed light. The fluorescent material can include single crystal grains in which primary grains have a diameter of 1 μm or less. Crystal defects, such as a grain boundary, do not often and sometimes never occur in the single crystal grain having a diameter of 1 μm or less. Thus, it is possible to restrain a phenomenon in which a crystal defect non-radially emits absorbed energy (as heat) which then reduces light emission efficiency.
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Office Action from Chinese Patent App. No. 200510071930.7 (May 9, 2008).
Kondo Kenichi
Miyake Yasuyuki
Taya Shuichi
Cermak Kenealy Vaidya & Nakajima LLP
Quarterman Kevin
Stanley Electric Co. Ltd.
Won Bumsuk
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