Hybrid material for use as coating means in optoelectronic components

1. A method of applying a transparent layer having a thickness of <500 μm in an optoelectronic component, wherein

I) a hybrid material comprising

a) an organopolysilazane material comprising repeat units of formula (I)

—[SiRR′—NH]  (I)

where

R and R′ are the same or different and are each H, methyl, ethyl, straight-chain or branched C3-C8 alkyl, C3-C8 cycloalkyl, C2-C6 alkenyl or aryl

with the proviso that R and R′ may not both be H; and

b) at least one surface-modified nanoscale inorganic oxide is applied to a surface in the optoelectronic component,

II) is dried, and

III) is optionally cured,

and wherein at least 20% of the repeat units of formula

(I) have at least one intramolecular crosslink.

2. The method as claimed in claim 1 , wherein in formula (I)

R and R′ are the same or different and are each H, methyl, ethyl, straight-chain, branched or cyclic C 3 -C 8 alkyl, phenyl, vinyl or aryl.

3. The method as claimed in claim 2 , wherein in formula (I)

R and R′ are the same or different and are each H, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, phenyl or vinyl.

4. The method as claimed in claim 3 , wherein in formula (I) R and R′ are the same or different and are each H, methyl or vinyl.

5. The method as claimed in claim 1 , wherein organopolysilazanes used were crosslinked by the catalytic action of fluoride ions.

6. The method as claimed in claim 1 , wherein component b) of the hybrid material consists of one or more types of inorganic oxidic nanoparticles having an average diameter in the range from 1 to 30 nm.

7. The method as claimed in claim 6 , wherein the nanoparticles are selected from the group consisting of Al 2 O 3 , SiO 2 , ZrO 2 and TiO 2 .

8. The method as claimed in claim 1 , wherein the nanoparticles are surface modified with alkoxysilanes of formula (V)

R″ n Si(OR′″) m   (V)

where

n is 1, 2 or 3 and m is 4−n;

R″ is methyl, ethyl, linear, branched or cyclic alkyl, of 3-8 carbon atoms, phenyl, C 2 -C 6 alkenyl; and

R′″ is methyl, ethyl, n-propyl, isopropyl, n-butyl or isobutyl.

9. The method as claimed in claim 8 , wherein in formula (V) n is 1 or 3 and m is 4−n;

R″ is methyl, ethyl, linear or branched C 3 -C 8 alkyl, phenyl or vinyl; and

R′″is methyl or ethyl.

10. The method as claimed in claim 9 , wherein in formula (V)

n is 1 or 3 and m is 4−n;

R″ is methyl, ethyl or linear or branched C 3 -C 8 alkyl; and

R′″ is methyl or ethyl.

11. The method as claimed in claim 1 , wherein the amount of inorganic nanoparticles in the hybrid material is in the range from 1 to 85 wt %.

12. The method as claimed in claim 1 , wherein the optoelectronic component is an LED or a display.

13. The method as claimed in claim 12 , wherein the optoelectronic component is an LED and the coating comprises luminophores and/or converters.

14. The method as claimed in claim 1 , wherein

the hybrid material

is obtained by provision of one or more organopolysilazanes of formula (I), crosslinking of the polysilazanes of formula (I) by treatment with a fluoride catalyst, and mixing with the surface-modified nanoscale inorganic oxide.

15. The method as claimed in claim 1 , wherein in step III) the organopolysilazane material is partially or completely converted into an organopolysiloxane by hydrolysis at temperatures >150° C.

16. The method as claimed in claim 1 , wherein step III) is carried out at a temperature >50° C.

17. An optoelectronic component comprising one or more layers obtained from a hybrid material as described in claim 1 .

18. The method as claimed in claim 1 , wherein step III) is carried out at a temperature >60° C. and at a relative humidity of ≥70% and the nanoparticles are TiO 2 or ZrO 2 .

19. The method as claimed in claim 1 , wherein component b) of the hybrid material consists of one or more types of inorganic oxidic nanoparticles having an average diameter in the range from 3 to 20 nm.