Patent number: 8242680
Abstract: A green phosphor, has an orthorhombic structure of a Pnma space group and the Formula 1: (M11-xDx)pM2qOrAs??[Formula 1] wherein M1 is magnesium, calcium, strontium, barium, and any combination thereof, D is at least one of metal selected from the group consisting of europium, manganese, antimony, cerium, praseodymium, neodymium, samarium, terbium, dysprosium, erbium, ytterbium, bismuth, and any combination thereof, M2 is at least one selected from the group consisting of silicon, germanium, aluminum, gallium, and any combination thereof, A is at least one selected from the group consisting of chlorine, fluorine, bromine, iodine, and any combination thereof, and 2.7?p?3.3, 0.7?q?1.3, 3.5?r?4.5, 1.7?s?2.3, and 0<x?0.1. A method of preparing the green phosphor is disclosed, and a white light-emitting device including the green phosphor. The white light-emitting device has good thermal stability.
Type:
Grant
Filed:
June 1, 2011
Date of Patent:
August 14, 2012
Assignee:
Samsung Electronics Co., Ltd.
Inventors:
Tae-gon Kim, Tae-hyung Kim, Seoung-jae Im, Seung-joo Kim
Publication number: 20120068591
Abstract: A green phosphor, has an orthorhombic structure of a Pnma space group and the Formula 1: (M11-xDx)pM2qOrAs??[Formula 1] wherein M1 is magnesium, calcium, strontium, barium, and any combination thereof, D is at least one of metal selected from the group consisting of europium, manganese, antimony, cerium, praseodymium, neodymium, samarium, terbium, dysprosium, erbium, ytterbium, bismuth, and any combination thereof, M2 is at least one selected from the group consisting of silicon, germanium, aluminum, gallium, and any combination thereof, A is at least one selected from the group consisting of chlorine, fluorine, bromine, iodine, and any combination thereof, and 2.7?p?3.3, 0.7?q?1.3, 3.5?r?4.5, 1.7?s?2.3, and 0<x?0.1. A method of preparing the green phosphor is disclosed, and a white light-emitting device including the green phosphor. The white light-emitting device has good thermal stability.
Type:
Application
Filed:
June 1, 2011
Publication date:
March 22, 2012
Applicant:
SAMSUNG ELECTRONICS CO., LTD.
Inventors:
Tae-gon KIM, Tae-hyung KIM, Seoung-jae IM, Seung-joo KIM
Patent number: 8043529
Abstract: Provided are an alkaline earth metal silicate-based phosphor which is a compound represented by Formula 1 below, and a white light-emitting device (LED) including the same: (M11-x-yAxBy)aMgbM2cOdZe??Formula 1 wherein, M1 is one selected from the group consisting of Ba, Ca, and Sr; M2 is at least one selected from Si or Ge; A and B are each independently one selected from the group consisting of Eu, Ce, Mn, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Bi, Sn, and Sb; Z is at least one selected from the group consisting of a monovalent or divalent element, H, and N; and 0<x<1, 0?y?1, 6.3<a<7.7, 0.9<b<1.1, 3.6<c<4.4, 14.4<d<17.6, 14.4<d+e<17.6, and 0?e?0.18. The alkaline earth metal silicate-based phosphor has a broad excitation wavelength range, and thus, both a UV-LED and a blue LED can be used as excitation sources for white LEDs.
Type:
Grant
Filed:
October 6, 2009
Date of Patent:
October 25, 2011
Assignees:
Samsung LED Co., Ltd., Samsung Electro-Mechanics Co., Ltd.
Inventors:
Shunichi Kubota, Young-sic Kim, Seoung-jae Im