The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 2009
Filed:
Jul. 18, 2007
Masaaki Tamatani, Fujisawa, JP;
Hisayo Uetake, Yokohama, JP;
Ryosuke Hiramatsu, Kawasaki, JP;
Kazuaki Ootsuka, Yokosuka, JP;
Yasushi Hattori, Kawasaki, JP;
Naomi Shida, Tokyo, JP;
Masaaki Tamatani, Fujisawa, JP;
Hisayo Uetake, Yokohama, JP;
Ryosuke Hiramatsu, Kawasaki, JP;
Kazuaki Ootsuka, Yokosuka, JP;
Yasushi Hattori, Kawasaki, JP;
Naomi Shida, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Lighting & Technology Corporation, Tokyo, JP;
Abstract
A europium-activated alkaline earth orthosilicate luminescent material is provided, which includes a compound having a composition represented by a following formula 1:(SrBaCaEu)SiO  formula 1wherein, x, y, z and w satisfy following relational expressions 2, and 4 to 7, and are values satisfying the expression 3 when a, b, c and d are assumed to be 573, 467, 623 and 736, respectively:  expression 2600≦  expression 30≦/(1−)≦0.95  expression 40≦/(1−)≦0.4  expression 50</(1−)≦0.95  expression 60.02≦w≦0.2  expression 7the luminescent material shows an emission band having a peak wavelength of 600 nm or more when the luminescent material is excited by ultraviolet radiation having a wavelength of 254 nm.