LIGHT EMITTING DEVICE

PROBLEM TO BE SOLVED: To provide a light emitting device which provides stable white-color light having a high color rendering property without causing a change in emission wavelength of an LED element, and a change in color by a change in characteristics of a phosphor due to heat. SOLUTION: A red-c...

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Bibliographic Details
Main Authors ISHIDA MAKOTO, NAMIKI AKIO, YAJIMA TAKAYOSHI, TOUMON RYOICHI, YASUKAWA TAKEMASA, NONOKAWA TAKASHI
Format Patent
LanguageEnglish
Published 07.12.2006
Subjects
ADHESIVES
BASIC ELECTRIC ELEMENTS
CHEMISTRY
DYES
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
POLISHES
SEMICONDUCTOR DEVICES
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Summary:PROBLEM TO BE SOLVED: To provide a light emitting device which provides stable white-color light having a high color rendering property without causing a change in emission wavelength of an LED element, and a change in color by a change in characteristics of a phosphor due to heat. SOLUTION: A red-color phosphor 7A having a composition of CaAlSiN3:Eu2+which generates red-color light on the basis of excitation of blue-color light emitted from the LED element 2, and a green-color phosphor 7B having a composition of (Ca0.99)3Sc2Si3O12.015:Ce3+which generates green-color light, are included in a distributed manner in a sealing resin 7. Compared with white color attained on the basis of the relationship of complementary color of blue and yellow, white-color light having a superior color rendering property and a high color reproduction of 76% in terms of NTSC ratio is provided. COPYRIGHT: (C)2007,JPO&INPIT
Bibliography:Application Number: JP20050152753