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US 4,791,336 AGranted
Fluorescent composition and fluorescent luminous device
AssigneeFutaba Denshi Kogyo K.K.
InventorsKiyoshi Morimoto, Hitoshi Toki, Yoshitaka Satoh
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AssigneeFutaba Denshi Kogyo K.K.
InventorsKiyoshi Morimoto, Hitoshi Toki, Yoshitaka Satoh
Estimating the term…
A fluorescent composition capable of emitting light of various luminous colors under electron or ultraviolet excitation and a fluorescent luminous device having mounted such a fluorescent composition mounter therein. The fluorescent composition has a general formula of ZnO.Ga.sub.2 O.sub.3 and emits light of a luminous spectrum distributed at an ultraviolet or visible region. The fluorescent composition includes a matrix of ZnO.Ga.sub.2 O.sub.3 and Cd doped in the matrix. The fluorescent luminous device includes at least one ZnO.Ga.sub.2 O.sub.3 :Cd phosphor deposited on anode conductors and at least one luminous display section having an ultraviolet excitable visible light emitting phosphor deposited thereon within a region of radiation of ultraviolet rays emitted from the ZnO.Ga.sub.2 O.sub.3 :Cd phosphor.
A phosphor having a general formula ZnO.multidot.Ga.sub.2 O.sub.3 :Cd wherein the molar ratio of Ga.sub.2 O.sub.3 to ZnO is 1:0.5-4.0 and Cd is present in an amount of 5.times.10.sup.-4 to 3.times.10.sup.-1 mol., the phosphor being excitable by electron or ultraviolet excitation and having a peak wavelength emission of about 365 nm and exhibiting, a higher luminance than said phosphor absent Cd.
A phosphor having the general formula ZnO.multidot.Ga.sub.2 O.sub.3 :Cd, Re wherein Re is at least one element selected from the group consisting of Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, and Tm, the molar ratio of Ga.sub.2 O.sub.3 to ZnO is 1:1.4-4.0, Cd is present in an amount of 1.times.10.sup.-3 to 2.times.10.sup.-1 atm/mol.
Dependencies are inferred from the claim text.