Luminescent body and optical device including the same
AssigneesToyoda Gosei Co., Ltd., Gundula Roth, Walter Tews
InventorsGundula Roth, Walter Tews
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Abstract
A luminous body of prolonged fluorescence lifetime characterized by comprising not only an activator but also at least one coactivator selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sn, Sb and analogues thereof as a further luminescent center for enhancing the thermostability of luminous body. This luminous body excels in thermostability and fluorescence lifetime, so that it is useful as a luminous body for LED.
Claims17
A luminous body with a prolonged fluorescence lifetime, wherein the luminous body comprises silicate-germanate and is doped with europium to improve its thermostability, wherein the luminous body comprises an additional dopant and corresponds to the empirical formula:
- M′aM″b(Si1-zGez)c(Al,Ga,In)d(Sb,V,Nb,Ta)eO(a+b+2c+3d/2+5e/2−n/2)Xn:Eux,Ry
- wherein:
- M′ represents one or more elements selected from the group consisting of calcium (Ca), strontium (Sr), barium (Ba), and zinc (Zn);
- M″ represents one or more elements selected from the group consisting of magnesium (Mg), cadmium (Cd), manganese (Mn), and beryllium (Be);
- R represents one or more elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sn, and Sb;
- X represents an ion selected from the group consisting of fluorine (F), chlorine (Cl), and bromine (Br) to balance the charge;
- and
- 0.5≦a≦8,
- 0≦b≦5,
- 0<c≦10,
- 0≦d≦2,
- 0≦e≦2,
- 0≦n≦4,
- 0≦x≦0.5,
- 0≦y≦0.5, and
- 0<z<1.
A luminous body with a prolonged fluorescence lifetime, wherein the luminous body comprises aluminate-gallate and is doped with europium to improve its thermostability, wherein the luminous body comprises an additional dopant and corresponds to the empirical formula:
- M′4(Al,Ga)14(Si,Ge)pO25+2p:Eux,Ry
- wherein:
- M′ represents one or more elements selected from the group consisting of Sr, Ba, Ca, Mg, and Zn;
- R represents one or more elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sn, and Sb;
- and
- 0<p≦1, or
- the empirical formula
- M″(Al,Ga)2(Si,Ge)pO4+2p:Eux,Ry
- wherein:
- M″ represents one or more elements selected from the group consisting of Sr, Ba, Ca, Mg, and Zn;
- R represents one or more elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sn, and Sb;
- and
- 0<p≦1,
- 0≦x≦0.5, and
- 0≦y≦0.5.
A luminous body with a prolonged fluorescence lifetime, wherein the luminous body comprises alkaline earth metal aluminate-gallate and is doped with europium to improve its thermostability, wherein the luminous body comprises an additional dopant and corresponds to the empirical formula:
- M′a-a(Al,Ga)b(Si,Ge)b(Si,Ge)cO1.5b+1+3c/2:Eux,Ry
- wherein:
- M′ represents one or more elements selected from the group consisting of ca, Sr, Ba, and Mg;
- R represents one or more elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sn, and Sb;
- and
- 0≦a≦1,
- 0<b≦10,
- 0≦c≦8,
- 0≦x≦0.5, and
- 0≦y≦0.5.
Dependencies are inferred from the claim text.