PRODUCTION OF WHITE LIGHT SOURCE

PROBLEM TO BE SOLVED: To obtain an yellow light fluorescent powder capable of controlling a working wavelength by setting to have a specified compounding ratio and capable of keeping yellow light conversion rate at high efficiency by controlling the mole ratio of gadolinium. SOLUTION: This yellow li...

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Bibliographic Details
Main Authors GO KENEI, O SHINRYU, SON SOKEN, SEKI KEIJIN, YO INFU, RYU JOKI
Format Patent
LanguageEnglish
Published 26.09.2000
Edition7
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 obtain an yellow light fluorescent powder capable of controlling a working wavelength by setting to have a specified compounding ratio and capable of keeping yellow light conversion rate at high efficiency by controlling the mole ratio of gadolinium. SOLUTION: This yellow light fluorescent powder is obtained by having a composition of the formula (Y1-p-xCepGdx)3Al5O12 [0<=p<=0.05; x is molar fraction of gadolinium and 0<=x<=1], making controllable a working wavelength generating yellow light with irradiating blue light of 430-470 nm and making keepable yellow light conversion rate at high efficiency by controlling gadolinium molar ratio x in changing the working wavelength of blue light. It is preferable that wavelength of the blue light λ (nm) and x satisfy the formula 3x=A +Bλ+Cλ2+Dλ3+Eλ4 (A=126268.8005±0.37666; B=-1145.0025±0.3766; C=3.89314±0.00126; D=-0.00588±1.85931×10-6; E=3.33290×10-6±1.03219×10-9).
Bibliography:Application Number: JP19990071321