Carbidonitridosilicate luminescent substance
AssigneesLeuchtstoffwerk Breitungen GmbH, Triodonic.atco Optoelectronics GmbH
InventorsDetlef Starick, Sven Rösler, Sylke Rösler, Hubertus Thoresia Hintzen, Yuan Qiang Li
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Abstract
The invention relates to a luminescent substance consisting of a doped host lattice which absorbs at least one part of exciting radiation when it is excited by a high-energy radiation, thereby releasing an energy-poor emission radiation. The host lattice is embodied in the form of a carbidonitridosilicate-based compound. An illuminant which is used for producing white light and comprises a light emitting element and said luminescent substance are also disclosed.
Claims20
A luminescent substance comprising a doped host lattice, which, on excitation with a high-energy excitation radiation, absorbs at least a portion of this excitation radiation and then emits a lower-energy emission radiation, wherein the host lattice is a carbidonitridosilicate compound, which is not doped with cerium as an activator.
A luminescent substance from a doped host lattice, which absorbs at least a portion of the excitation radiation on excitation with a high-energy excitation radiation and then emits a lower-energy emission radiation, wherein the host lattice is a compound having the following general formula
- Ln(2−a−b+f)MI(a+b−f)Si(4−c−d−e−f)MII(c+d+e+f)N(6−a+b+d+e)O(a+d)C(1−b−e)
- where 0≦a≦2, 0≦b<1, 0≦c<4, 0≦d<4, 0≦e<1, 0≦f≦(a+b), and 0≦(b+e)<1, where
- Ln is an element or mixture of elements of the following group:
- indium (In),
- scandium (Sc),
- yttrium (Y),
- rare earths;
- MI is a divalent metal or a mixture of divalent metals;
- and
- MII is an element or a mixture of elements of the following group:
- germanium (Ge),
- boron (B),
- aluminum (Al);
- and
- wherein Tb3+ ions as activators and Ce3+ ions as coactivators are doped into the host lattice.
A luminescent substance from a doped host lattice, which absorbs at least a portion of the excitation radiation on excitation with a high-energy excitation radiation and then emits a lower-energy emission radiation, wherein the host lattice is a compound having the following general formula
- Ln(2−a−b+f)MI(a+b−f)Si(4−c−d−e−f)MII(c+d+e+f)N(6−a+b+d+e)O(a+d)C(1−b−e)
- where 0≦a≦2, 0≦b<1, 0≦c<4, 0≦d<4, 0≦e<1, 0≦f≦(a+b), and 0≦(b+e)≦1, where
- Ln is an element or mixture of elements of the following group:
- indium (In),
- scandium (Sc),
- yttrium (Y),
- rare earths;
- MI is a divalent metal or a mixture of divalent metals;
- and
- MII is an element or a mixture of elements of the following group:
- germanium (Ge),
- boron (B),
- aluminum (Al);
- and
- the doped activators in the host lattice are divalent or trivalent rare earth ions or transition metal ions, wherein at least one of the parameters c, d, e or f is selected to be greater than zero.
A luminescent substance from a doped host lattice, which absorbs at least a portion of the excitation radiation on excitation with a high-energy excitation radiation and then emits a lower-energy emission radiation, wherein the host lattice is a compound having the following general formula
- Ln(2−a−b+f)MI(a+b−f)Si(4−c−d−e−f)MII(c+d+e+f)N(6−a+b+d+e)O(a+d)C(1−b−e)
- where 0≦a≦2, 0≦b<1, 0≦c<4, 0≦d<4, 0≦e<1, 0≦f≦(a+b), and 0≦(b+e)<1, where
- Ln is an element or mixture of elements of the following group:
- indium (In),
- scandium (Sc),
- yttrium (Y),
- rare earths;
- MI is a divalent metal or a mixture of divalent metals;
- and
- MII is an element or a mixture of elements of the following group:
- germanium (Ge),
- boron (B),
- aluminum (Al);
- and
- the doped activators in the host lattice are divalent or trivalent rare earth ions or transition metal ions, wherein at least one of parameters a or d is selected to be greater than zero.
Dependencies are inferred from the claim text.