Phosphorescent phosphor
AssigneeNemoto & Co., Ltd.
InventorsYoshihiko Murayama, Nobuyoshi Takeuchi, Yasumitsu Aoki, Takashi Matsuzawa
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Abstract
A phosphorescent phosphor according to the present invention includes a matrix expressed by MAl.sub.2 O.sub.4 in which M is at least one metal element selected from a group consisting of calcium, strontium and barium. Alternatively, a phosphorescent phosphor according to the present invention includes a matrix expressed by MAl.sub.2 O.sub.4 in which M is plural metal elements which are composed of magnesium and at least one metal element selected from a group consisting of calcium, strontium and barium and europium is added as an activator, further, co-activator is added.
Claims4
A phosphorescent phosphor comprising a matrix expressed by MAl.sub.2 O.sub.4 in which M is at least one metal element selected from a group consisting of calcium, strontium, and barium, wherein 0.001 % to 10% of europium is doped to said matrix expressed by MAl.sub.2 O.sub.4 as an activator, and wherein 0.001% to 10% of at least one element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, tin and bismuth is doped to said matrix expressed by MAl.sub.2 O.sub.4 as a co-activator, in terms of mol % relative to the metal element expressed by M.
A phosphorescent phosphor comprising a matrix expressed by MAl.sub.2 O.sub.4 in which M is plural metal elements which are composed of magnesium and at least one metal element selected from a group consisting of calcium, strontium, and barium, wherein 0.001% to 10% of europium is doped to said matrix expressed by MAl.sub.2 O.sub.4 as an activator, and wherein 0/001% to 10% of at least one element selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, tin and bismuth is doped to said matrix expressed by MAl.sub.2 O.sub.4 as a co-activator, in terms of mol % relative to the metal element expressed by M.
Dependencies are inferred from the claim text.