Fluorescent film with luminescent particles
View Patent ↗A fluorescent film for use with a low-pressure discharge lamp is formed as a silicone elastomer in which luminescent particles are embedded. The film is formed by the steps of (a) mixing a hydroxyl polydiorganosiloxane with an organohydrogen siloxane, (b) adding luminescent particles, and (c) generating a chemical reaction by means of a platinum catalyst at room temperature.
1. A fluorescent film formed as a silicone elastomer in which hydroxyl polydiorganosiloxane and organohydrogen siloxane are cross-linked and in which luminescent particles are embedded.
2. A fluorescent film according to claim 1 , wherein the hydroxyl polydiorganosiloxane comprises various polymers with a minimum viscosity of 1000 centipoise at 25° C.
3. A fluorescent film according to claim 2 , wherein the hydroxyl polydiorganosiloxane is formed as at least one of hydroxyl polydimethylsiloxane, its copolymers, phenylmethylsiloxane and polymethyl-3,3,3-trifluoropropylsiloxane.
4. A fluorescent film according to claim 2 wherein the organohydrogen siloxane is formed as silicone with at least two silicon-bonded hydrogen atoms per molecule.
5. A fluorescent film according to claim 4 wherein the organohydrogen siloxane comprises one of homopolymers, copolymers, and mixtures thereof.
6. A fluorescent film according to claim 1 wherein the fluorescent film has a thickness between 10 and 800 μm.
7. A fluorescent film as in claim 1 wherein the luminescent particles have a surface density which is between 1 and 20 mg/cm 2 .
8. A fluorescent film according to claim 1 wherein the luminescent particles have a grain size which is between 5 and 15 μm.
9. An irradiation arrangement comprising:
a low-pressure discharge lamp with an enveloping body which is transparent to UVC, and electrodes which can be contacted from the outside projecting into the enveloping body, and
a fluorescent film formed as a silicone in which elastomer hydroxyl polydiorganosiloxane and organohydrogen siloxane are cross-linked and in which luminescent particles are embedded.
10. An irradiation arrangement according to claim 9 , wherein the fluorescent film is applied to an outer surface of the enveloping body.
11. An irradiation arrangement according to claim 10 wherein fluorescent films with different doping are applied to the enveloping body.
12. An irradiation arrangement according to claim 9 further comprising a displacement body arranged in the enveloping body, so that channels are formed between the enveloping body and displacement body.
13. An irradiation arrangement according to claim 12 , wherein the displacement body is constructed as a closed hollow body.
14. An irradiation arrangement according to claim 12 further comprising a reflector layer applied to an outer surface of the displacement body.
15. An irradiation arrangement according to claim 12 wherein the displacement body comprises a material that is transparent to radiation emitted by the discharge lamp.
16. An irradiation arrangement according to claim 9 wherein the fluorescent film is fitted to the enveloping body in the form of an interchangeable frame.
17. An irradiation arrangement according to claim 9 , further comprising a dispensing roller and a take-up roller on which the fluorescent film is wound up, whereby films with different doping can befitted to the enveloping body.
18. A method for producing a fluorescent film formed as a silicone elastomer in which luminescent particles are embedded, comprising the following steps:
(a) mixing a hydroxyl polydiorganosiloxane with an organohydrogen siloxane,
(b) adding luminescent particles, and
(c) generating a chemical reaction by means of a platinum catalyst at room temperature.
19. A method for producing a fluorescent film according to claim 18 , wherein the hydroxyl polydiorganosiloxane comprises various polymers with a minimum viscosity of 1000 centipoise at 25° C.
20. A method for producing a fluorescent film according to claim 19 , wherein the hydroxyl polydiorganosiloxane is formed as at least one of hydroxyl polydimethylsiloxane, its copolymers, phenylmethylsiloxane, and polymethyl-3,3,3-trifluoropropylsiloxane.
21. A method for producing a fluorescent film according to claim 18 wherein the organohydrogen siloxane is formed as silicone with at least two silicon-bonded hydrogen atoms per molecule.
22. A method for producing a fluorescent film according to claim 21 wherein the organohydrogen siloxane comprises one of homopolymers, copolymers, and mixtures thereof.
23. A method for producing a fluorescent film according to claim 18 wherein the platinum catalyst comprises one of a platinum chloride, platinum salts, and chloroplatinic acid.
24. A method for producing a fluorescent film according to claim 23 , wherein the chloroplatinic acid is in the form one of a hexahydrate and anhydrous chloroplatinic acid.