Highly efficient molecules showing resonant energy transfer
The invention provides a lighting device comprising a light source configured to provide light source light having a blue light component and a light converter configured to convert at least part of the light source light into converter light, wherein the light converter comprises a polymeric matrix ( 22 ) with a luminescent material, wherein the luminescent material comprises a luminescent molecule ( 300 ) comprising a first group ( 310 ) able to absorb at least part of the blue light component, and a second group ( 320 ) able to emit luminescent molecule light having a red light component, wherein the first group ( 310 ) is configured to transfer at least part of the energy acquired by the absorption of said blue light component to the second group ( 320 ) for generation of said luminescent molecule light having a red light component.
1. A lighting device comprising a light source configured to provide light source light having a blue light component and a light converter configured to convert at least part of the light source light into converter light, wherein the light converter comprises a polymeric matrix with a luminescent material,
wherein the luminescent material comprises an organic luminescent molecule comprising a first group able to absorb at least part of the blue light component, and a second group able to emit luminescent molecule light having a red light component,
wherein the organic luminescent molecule further comprises a bulky group, wherein the bulky group comprises a ternary or quaternary carbon, and wherein the bulky group is arranged between the first group and the second group,
wherein the first group is configured to transfer at least part of the energy acquired by the absorption of said at least part of the blue light component to the second group for generation of said luminescent molecule light having a red light component, and wherein the second group comprises a group based on:
or a derivative thereof.
2. The lighting device according to claim 1 , wherein the first group comprises a group configured to absorb at least part of the blue light component and is able to convert into one or more of green light and yellow light, wherein the second group is configured to absorb one or more of said green light and yellow light, and wherein the first group is configured as Forster resonant energy transfer donor and wherein the second group is configured as Forster resonant energy transfer acceptor.
3. The lighting device according to claim 1 , wherein the luminescent molecule comprises one or more yellow donor groups as first group(s) and one or more red acceptor groups as second group(s).
4. The lighting device according to claim 1 , wherein the first group comprises one or more groups based on one or more of:
and derivatives thereof.
5. The lighting device according to claim 1 , wherein the bulky group comprises:
or a derivative thereof.
6. The lighting device according to claim 1 , wherein the first group comprises one or more groups based on one or more of:
and derivatives thereof.
7. The lighting device according to claim 1 , wherein the first group and the second group are separated from each other with a covalently bound chain of at least 4 chemical bonds, wherein the chain comprises one or more of C, O, N and Si atoms.
8. The lighting device according to claim 1 , wherein the number of first groups in the luminescent molecule is larger than the number of second groups.
9. The lighting device according to claim 1 , wherein the luminescent molecule is selected from the group consisting of:
and derivatives thereof.
10. The lighting device according to claim 1 , wherein the light source comprises a solid state light source, wherein the matrix comprises one or more of polymethylmethacrylate, polyethylene terephthalate, and polyethylene naphtalate, and wherein the lighting device further includes a second luminescent material configured to provide second luminescent material light having one or more of green light component and a yellow light component.
11. A luminescent material comprising an organic luminescent molecule comprising a first group able to absorb at least part of the blue light component, and a second group able to emit luminescent molecule light having a red light component, wherein the first group is configured to transfer at least part of the energy acquired by the absorption of said at least part of the blue light component to the second group for generation of said luminescent molecule light having a red light component, and wherein the second group comprises a group based on:
or a derivative thereof.
12. The luminescent material according to claim 11 , comprising one or more of:
and derivatives thereof.
13. A lighting device comprising a light source configured to provide light source light and a luminescent material as defined in claim 11 configured to convert at least part of the light source light into luminescent molecule light.