Arrangement of luminescent materials, wavelength-converting casting compound and light source
View Patent ↗The invention proposes an arrangement of luminescent materials for excitation by means of a radiation source and involving the use of a luminescent material having a Ce-activated garnet structure A 3 B 5 O 12 , in which the first component A contains at least one element from the group consisting of Y, Lu, Sc, La, Gd, Sm and Tb and the second component B represents at least one of the elements Al, Ga and In, and a plurality of the luminescent materials are mixed together.
1. A wavelength converting casting compound comprising
a mixture of luminescent materials having different compositions,
wherein at least one of said luminescent materials has a Ce-activated garnet structure A 3 B 5 O 12 , in which the first component A contains at least one element from the group consisting of Y, Lu, Sc, La, Gd, Sm, and Tb and consists at least in part of Tb as a constitute of the host lattice, and the second component B contains at least one element from the group consisting of Al, Ga and In,
wherein said mixture of luminescent materials is mixed into transparent plastic.
2. The casting compound of claim 1 ,
wherein another of said luminescent materials has a Ce-activated garnet structure A 3 B 5 O 12 , in which the first component A contains at least one element from the group consisting of Y, Lu, Sc, La, Gd, Sm and Tb and consists at least in part of Tb as a constitute of the host lattice, and the second component B contains at least one element from the group consisting of Al, Ga and In.
3. The casting compound of claim 1 wherein another of said luminescent materials includes a garnet structure (Tb 1−x−y SE x Ce y ) 3 (Al,Ga) 5 O 12 , where
SE=Y, Gd, La, Sm and/or Lu; 0≦x≦0.5−y; and 0<y<0.1.
4. The casting compound of claim 1 wherein said mixture of luminescent materials is provided as a mixture of inorganic luminescent pigment powders.
5. The casting compound of claim 4 wherein said luminescent pigment powders have particle sizes ≦20 μm and a mean particle diameter d50≦5 μm.
6. The casting compound of claim 5 further comprising at least one member of the group consisting of a thixotropic agent, a mineral diffusor, a water repellent and a bonding agent.
7. The casting compound of claim 4 , 5 , or 6 , wherein said mixture of luminescent materials is excitable by radiation from the range of 400 to 500 nm.
8. The casting compound of claim 4 , 5 , or 6 , wherein said mixture of luminescent materials is excitable by radiation from the range of 420 to 490 nm.
9. The casting compound of claim 4 , 5 , or 6 , wherein another of said luminescent materials includes a garnet structure (Tb 1−x−y SE x Ce y ) 3 (Al,Ga) 5 O 12 , where
SE=Y, Gd, La, Sm and/or Lu; 0≦x≦0.5−y; and
0<y<0.1.
10. The casting compound of claim 4 , 5 , or 6 , wherein another of said luminescent materials includes a garnet structure (Tb 1−x−y SE x Ce y ) 3 (Al,Ga) 5 O 12 , where
SE=Y, Gd, La, Sm and/or Lu; 0≦x≦0.5−y; and
0<y<0.1, and
wherein said mixture of luminescent materials is excitable by radiation from the range of 400 to 500 nm.
11. The casting compound of claim 4 , 5 , or 6 , wherein another of said luminescent materials includes a garnet structure (Tb 1−x−y SE x Ce y ) 3 (Al,Ga) 5 O 12 , where
SE=Y, Gd, La, Sm and/or Lu; 0≦x≦0.5−y; and
0<y<0.1 and
wherein said mixture of luminescent materials is excitable by radiation from the range of 420 to 490 nm.
12. A wavelength converting casting compound comprising
a mixture of luminescent materials having different compositions,
wherein at least one of said luminescent materials has a Ce-activated garnet structure A 3 B 5 O 12 , in which the first component A contains at least one element from the group consisting of Y, Lu, La, Gd, Sm, and Tb and consists at least in part of Tb as a constitute of the host lattice, and the second component B contains at least one element from the group consisting of Al, Ga and In,
wherein said mixture of luminescent materials is mixed into transparent plastic.
13. The casting compound of claim 12 ,
wherein another of said luminescent materials has a Ce-activated garnet structure A 3 B 5 O 12 , in which the first component A contains at least one element from the group consisting of Y, Lu, La, Gd, Sm and Tb and consists at least in part of Tb as a constitute of the host lattice, and the second component B contains at least one element from the group consisting of Al, Ga and In.
14. The casting compound of claim 12 wherein another of said luminescent materials includes a garnet structure (Tb 1−x−y SE x Ce y ) 3 (Al,Ga) 5 O 12 , where
SE=Y, Gd, La, Sm and/or Lu; 0≦x≦0.5−y; and
0<y<0.1.
15. The casting compound of claim 12 wherein said mixture of luminescent materials is provided as a mixture of inorganic luminescent pigment powders.
16. The casting compound of claim 15 wherein said luminescent pigment powders have particle sizes ≦20 μm and a mean particle diameter d50≦5 μm.
17. The casting compound of claim 16 further comprising at least one member of the group consisting of a thixotropic agent, a mineral diffusor, a water repellent and a bonding agent.
18. The casting compound of claim 15 , wherein said mixture of luminescent materials is excitable by radiation from the range of 400 to 500 nm.
19. The casting compound of claim 15 , wherein said mixture of luminescent materials is excitable by radiation from the range of 420 to 490 nm.
20. The casting compound of claim 15 , wherein another of said luminescent materials includes a garnet structure (Tb 1−x−y SE x Ce y ) 3 (Al,Ga) 5 O 12 , where
SE=Y, Gd, La, Sm and/or Lu; 0≦x≦0.5−y; and
0<y<0.1.
21. The casting compound of claim 15 , wherein another of said luminescent materials includes a garnet structure (Tb 1−x−y SE x Ce y ) 3 (Al,Ga) 5 O 12 , where
SE=Y, Gd, La, Sm and/or Lu; 0≦x≦0.5−y; and
0<y<0.1, and
wherein said mixture of luminescent materials is excitable by radiation from the range of 400 to 500 nm.
22. The casting compound of claim 15 wherein another of said luminescent materials includes a garnet structure (Tb 1−x−y SE x Ce y ) 3 (Al,Ga) 5 O 12 , where
SE=Y, Gd, La, Sm and/or Lu; 0≦x≦0.5−y; and
0<y<0.1 and
wherein said mixture of luminescent materials is excitable by radiation from the range of 420 to 490 nm.