公开(公告)号：US3785991A

公开(公告)日：1974-01-15

申请号：US20975071

申请日：1971-12-20

申请人： DAINIPPON TORYO KK

发明人： TOSHINAI A ,  HASE T

IPC分类号： C09K11/77 ,  C09K11/85 ,  C09K1/06

CPC分类号： C09K11/7772

摘要： THIS INVENTION RELATES TO A PHOSPHOR FOR INFRARED-TOVISIBLE CONVERSION COMPRISING AS A MAIN INGREDIENT A COMPLEX RARE EARTH FLUORIDE HAVING A GENERAL COMPOSITION EXPRESSED BY THE FORMULAE (Y1-X-YYBXAY)F3,

(LA1-X-YYBXAY)F3

OR (LU1-X-YYBXAY)F3, KRESPECTIVELY, WHEREIN X IS IN THE RANGE OF FROM 0.05 TO 0.5, Y IS IN THE RANGE OF FROM 0.02 TO 0.09 WHEN YTTRIUM FLUORIDE IS USED AS THE HOST MATERIAL, AND FROM 0.001 TO 0.1 WHEN LANTHANUM OR LUTETIUM FLUORIDE IS USED AS THE HOST MEATERIAL, AND A IS AT LEAST ONE MEMBER SELECTED FROM ER AND HO, AND ZINC INCORPORATED IN THE COMPLEX RARE EARTH FLUORIDE, AND A PROCESS FOR THE PREPARATION OF A ZINC-INCORPORATED PHOSPHOR FOR INFRARED-TOVISIBLE CONVERSION, WHICH COMPRISES ADDING ZINC FLUORIDE OR ZINC SILICOFLUORIDE PRIOR TO OR AFTER FORMATION OF SAID COMPLEX RARE EARTH FLUORIDE, AND SUBSEQUENT HEATING.