Light emitting diode with wavelength conversion
View Patent ↗The invention relates to a wavelength-converting reaction resin compound into which a wavelength-converting luminescent material and a thixotroping agent are mixed, wherein the luminescent material contains inorganic luminescent particles. The thixotroping agent is present, at least in part, in the form of nanoparticles. Methods of producing the reaction resin compound and light-emitting diode elements having such reaction resin compounds are indicated.
1. A wavelength-converting reaction resin compound comprising a mixture of a wavelength-converting luminescent material and a thixotroping agent, wherein the luminescent material contains inorganic luminescent particles,
wherein at least part of the thixotroping agent is present in the form of nanoparticles having a d 50 value, measured in Q3, that is greater than or equal to 5 nm and less than or equal to 15 nm.
2. The reaction resin compound according to claim 1 , wherein the inorganic luminescent particles have a d 50 value, measured in Q3, that is greater than 5 μm and less than or equal to 25 μm.
3. The reaction resin compound according to claim 1 ,
wherein the inorganic luminescent particles have a d 50 value, measured in Q3, that is greater than or equal to 10 μm and less than or equal to 20 μm.
4. The reaction resin compound according to claim 1 ,
wherein the nanoparticles of the thixotroping agent have a d 50 value, measured in Q3, that is greater than or equal to 9 nm and less than or equal to 12 nm.
5. The reaction resin compound according to claim 1 ,
further comprising at least one material of the group consisting of epoxy resin, silicone resin and acrylic resin.
6. The reaction resin compound according to claim 1 , wherein the thixotroping agent has a colloidal SiO 2 solution.
7. The reaction resin compound according to claim 1 for enclosing a radiation-emitting body, whose emission radiation spectrum contains at least radiation from the ultraviolet, blue or green spectral region, which is pervious to at least part of the radiation emitted by the body,
wherein the luminescent material contains at least luminescent particles from the group of garnets doped with rare earths, thiogallates doped with rare earths, aluminates doped with rare earths or orthosilicates doped with rare earths.
8. The reaction resin compound according to claim 7 , wherein the radiation-emitting body is a semiconductor chip.
9. The reaction resin compound according to claim 1 for enclosing a radiation-emitting body, whose emission radiation spectrum contains at least radiation from the ultraviolet, blue or green spectral region, which is pervious to at least part of the radiation emitted by the body,
wherein the luminescent material contains at least luminescent particles from the group of garnets having the general formula A 3 B 5 O 12 :M, where the component A contains at least one element from the group consisting of Y, Gd, Th, La, Lu, Sc and Sm, the component B contains at least one element from the group consisting of Al, Ga and In, and the component M contains at least one element from the group consisting of Ce, Pr, Eu, Cr, Nd and Er.
10. The reaction resin compound according to claim 9 , wherein the radiation-emitting body is a semiconductor chip.
11. A light-radiating optical element comprising a wavelength-converting reaction resin compound according to claim 1 and a semiconductor body that emits electromagnetic radiation during operation of the optical element,
wherein the semiconductor body has a sequence of semiconductor layers that is suitable for emitting electromagnetic radiation from the ultraviolet, blue and/or green spectral region during operation of the semiconductor element, the luminescent pigments convert part of the radiation coming from this spectral region into radiation having a higher wavelength in such a way that the semiconductor element emits mixed radiation, comprising the radiation having the higher wavelength and the remaining radiation from the ultraviolet, blue and/or green spectral region.
12. A light-radiating optical element according to claim 11 ,
wherein the reaction resin compound encloses at least part of the semiconductor body.
13. A light-radiating semiconductor element according to claim 11 , further comprising a non-light-transparent basic housing,
wherein the semiconductor body is positioned in a recess of the non-light-transparent basic housing, and wherein the recess is at least partially filled with the reaction resin compound.
14. The light-radiating optical element according to claim 11 , wherein the mixed radiation is multicolored light.
15. A light-radiating semiconductor body having a wavelength-converting reaction resin compound according to claim 1 ,
wherein at least part of the surface of the light-radiating semiconductor body is coated with a conversion coating made of the reaction resin compound, which coating has essentially the same thickness throughout.
16. The reaction resin compound according to claim 1 , wherein the thixotroping agent contains at least one material of the group consisting of colloidal SiO 2 -solution-gel, titanium dioxide, zirconium oxide, and SiO 2 .
17. The reaction resin compound according to claim 1 , wherein the thixotroping agent contains at least a pyrogenically produced oxide.
18. The reaction resin compound according to claim 1 , wherein the thixotroping agent contains nanoparticles, which are produced in a colloid chemistry process, a pyrogenic process in a gas phase reaction or in a colloidal-solution-gel procedure.
19. The reaction resin compound according to claim 1 , wherein the nanoparticles have a surface coating matched to the reaction resin to stabilize a dispersion of the wavelength-converting luminescent material in the reaction resin compound.
20. The reaction resin compound according to claim 1 for enclosing a radiation-emitting body, whose emission radiation spectrum contains at least radiation from the ultraviolet, blue or green spectral region, which is pervious to at least part of the radiation emitted by the body, wherein the luminescent material contains at least luminescent particles from the group of garnets having the general formula A 3 B 5 O 12 :M, where the component A contains at least one element from the group consisting of Y, Gd, Tb, La, Lu, and Sm, the component B contains at least one element from the group consisting of Al, Ga and In, and the component M contains at least one element from the group consisting of Ce, Pr, Eu, Cr, Nd and Er.
21. A wavelength-converting reaction resin compound comprising a mixture of a wavelength-converting luminescent material and a thixotroping agent, wherein the luminescent material contains inorganic luminescent particles having a d 50 value, measured in Q3, that is greater than or equal to 10 μm and less than or equal to 20 μm, and wherein at least part of the thixotroping agent is present in the form of nanoparticles.