Cross-linked encapsulated phosphorescent molecules
View Patent ↗There is provided herein cross-linked, phosphorescent micro- and nano-particles and applications of those particles. The invention uses halogen-containing polymers and co-polymers (HCPs) as an encapsulation matrix for organic and organometallic phosphorescent compounds to form micro- or nano-particles. The phosphorescence of these encapsulated phosphorescent particles is substantially unaffected by phosphorescence quenchers such as oxygen and water molecules at ambient conditions. The invention provides methods of making cross-linked phosphorescent particles. HCPs may be directly cross-linked through linking moieties that are a part of the polymer, or cross-linked through other separate bridging or cross-linking materials Cross-linked particles are more stable than the non-cross-linked counterparts and more resistant to temperature, surfactants, and organic solvents.
1. A phosphorescent particle comprising an organic phosphorescent material encapsulated in a cross-linked halogen-containing polymeric matrix, wherein said organic phosphorescent material includes a porphyrin metal complex, porphine metal complex, pyridine metal complex, or a combination thereof, wherein said cross-linked halogen-containing polymeric matrix has at least one percent by mass weight of halogen atoms, and wherein said cross-linked halogen-containing polymeric matrix shields said encapsulated phosphorescent material from phosphorescence quenchers.
2. The phosphorescent particle of claim 1 , wherein said cross-linked halogen-containing polymeric matrix is formed by cross-linking one halogen-containing polymer through linking moieties.
3. The particle of claim 1 , wherein said cross-linked halogen-containing polymeric matrix is formed by cross-linking two or more polymers through linking moieties where at least one of said polymers has halogen atoms.
4. The particle of claim 1 , wherein said halogen atoms include fluoride, chloride, bromide and iodide.
5. The particle of claim 1 , wherein said cross-linked halogen-containing polymeric matrix has between about 5 and 80 weight percent halogen atoms.
6. The particle of claim 1 , wherein said cross-linked halogen-containing polymeric matrix has between about 10 and 60 weight percent halogen atoms.
7. The particle of claim 2 , wherein said linking moieties are selected from the group consisting of carboxylic acid groups, ethanolamine groups, hydroxyl groups, amine groups, amino groups, imine group, epoxy groups, isocyanate groups, melamine groups, metal alkoxides, hydrolysable organosilyl groups, beta-ketoester groups and polyethylene glycol groups.
8. The particle of claim 3 , wherein at least one of said polymers is poly (vinyl chloride-co-vinyl acetate-co-maleic acid).
9. The particle of claim 3 , wherein at least one of said polymers is poly(vinyl chloride-co-vinyl acetate-co-epoxy monomer).
10. The particle of claim 1 , wherein said cross-linked halogen-containing polymeric matrix is formed by cross-linking poly (vinyl chloride-co-vinyl acetate-co-epoxy monomer) and poly (vinyl chloride-co-vinyl acetate-co-epoxy monomer).
11. The particle of claim 3 , wherein at least one of said polymers is a block copolymer and said block copolymer is selected from the group consisting of di-block copolymers, tri-block copolymers, star-block copolymers, and multi-block copolymers.
12. The particle of claim 11 , wherein said blocks are in an arrangement selected from the group consisting of head to end, head to head, end to end and end group.
13. The particle of claim 1 , wherein said cross-linked halogen-containing polymeric matrix is formed by cross-linking polymers and co-polymers through a method selected from the group consisting of heat, photo-initiation and free radical cross-linking.
14. The particle of claim 1 , wherein said organic phosphorescent material is covalently bonded with said polymeric matrix.
15. The particle of claim 1 , wherein the particle is a nanoparticle.
16. A phosphorescent particle comprising an organic phosphorescent material, wherein said organic phosphorescent material is encapsulated in a cross-linked halogen-containing polymeric matrix, wherein said cross-linked halogen-containing polymeric matrix includes at least one percent halogen atoms by mass weight of the polymeric matrix, said cross-linked halogen-containing polymeric matrix including two or more polymers cross-linked through linking moieties, wherein at least one of said polymers is a halogen-containing polymer.
17. The particle of claim 16 , wherein said cross-linked halogen-containing polymeric matrix includes between about 5 and 80 weight percent halogen atoms.
18. The particle of claim 16 , wherein said linking moieties are selected from the group consisting of carboxylic acid groups, ethanolamine groups, hydroxyl groups, amine groups, amino groups, imine group, epoxy groups, isocyanate groups, melamine groups, metal alkoxides, hydrolysable organosilyl groups, beta-ketoester groups and polyethylene glycol groups.
19. The particle of claim 16 , wherein at least one of said polymers is poly(vinyl chloride-co-vinyl acetate-co-maleic acid).
20. The particle of claim 16 , wherein at least one of said polymers is poly(vinyl chloride-co-vinyl acetate-co-epoxy monomer).
21. The particle of claim 16 , wherein at least one of said polymers is a block copolymer.
22. The particle of claim 16 , wherein the particle is a nanoparticle.