公开(公告)号：US6143200A

公开(公告)日：2000-11-07

申请号：US202235

申请日：1998-12-10

申请人： Takeshi Akiwa ,  Yuji Aoki ,  Etsuo Shimizu ,  Hideo Suzuki

发明人： Takeshi Akiwa ,  Yuji Aoki ,  Etsuo Shimizu ,  Hideo Suzuki

IPC分类号： C09K11/77 ,  C09K11/84 ,  G21K1/06 ,  G21K4/00 ,  G01T1/20

CPC分类号： G21K4/00 ,  C09K11/7771 ,  G21K1/06

摘要： When each of a rare earth oxysulfide phosphor represented by the composition formula (I) of Ln.sub.2 O.sub.2 S:xRe, yM wherein Ln represents at least one rare earth element selected from Y, La and Gd; Re represents at least one rare earth element selected from Pr and Tb; M represents at least one element selected from Nb, Ta and Mn; and x and y are numbers which satisfy the conditions of 1.times.10.sup.-4 .ltoreq.x.ltoreq.0.2 and 0.01 ppm .ltoreq.y.ltoreq.1000 ppm, respectively, and a rare earth oxysulfide phosphor represented by the composition formula (II) of (Gd .sub.1-x-y-z, Pr.sub.x, Sc.sub.y, Ce.sub.z).sub.2 O.sub.2 S wherein x, y and z are numbers which satisfy the conditions of 10.sup.-4 .ltoreq.x.ltoreq.2.times.10.sup.-1, 10.sup.-4 .ltoreq.y.ltoreq.10.sup.-1 and 0.ltoreq.z.ltoreq.10.sup.-6, respectively is excited by radiation, each of them emits a scintillation at high efficiency, and decreases the afterglow. Each of the phosphors is used for an X-ray detector as a scintillator, and is useful for an X-ray CT apparatus.

摘要翻译： PCT No.PCT / JP97 / 02119 Sec。 371 1998年12月10日第 102（e）日期1998年12月10日PCT提交1997年6月20日PCT公布。 公开号WO97 / 48781 日期1997年12月24日当由Ln 2 O 2 S：xRe，yM的组成式（I）表示的稀土氧硫化物荧光体中的每一种，其中Ln表示选自Y，La和Gd中的至少一种稀土元素; Re表示选自Pr和Tb中的至少一种稀土元素; M表示选自Nb，Ta和Mn中的至少一种元素; x和y分别为满足1×10 -4≤x≤0.2,0.01ppm≤y≤1000ppm的条件的数和由组成式（II）表示的稀土氧硫化物荧光体 （Gd 1-xyz，Prx，Scy，Cez）2 O 2 S，其中x，y和z是满足条件为10 -4 = 2×10-1,10-4 = y = 10-1和0