Surface-modified metal oxide particle material, dispersion liquid, silicone resin composition, silicone resin composite body, optical semiconductor light emitting device, lighting device, and liquid crystal imaging device

1. A surface-modified metal oxide particle material obtained by performing surface modification on a metal oxide particle having an average primary particle diameter of 3 nm or more and 10 nm or less with a surface-modifying material having at least a phenyl group and a group capable of undergoing a crosslinking reaction with a functional group in a silicone resin-forming component,

wherein the group capable of undergoing a crosslinking reaction with a functional group in a silicone resin-forming component is a hydrogen atom,

wherein the surface-modifying material is a combination of a surface-modifying material containing a phenyl group and a surface-modifying material containing a hydrogen atom,

the surface-modifying material containing a phenyl group is one or more kinds selected from the materials having a structure represented by the following formulae (1), (2) and silicone materials having a resin structure (three-dimensional network structure) containing a phenyl group and an alkoxy group,

(C 6 H 5 ) n SiX 4−n   formula (1):

wherein, n is an integer of from 1 to 3, X is selected from a methoxy group, an ethoxy group, a hydroxyl group, a halogen atom, and a carboxy group; and when (4−n) is 2 or more, each X may be the same as or different from every other X, formula (2):

wherein a is an integer of from 1 to 100; b is an integer of from 0 to 100; and c is an integer of from 1 to 3; and wherein each of A, B, C and D is one or two or more members selected from the group consisting of a phenyl group and an alkyl group having from 1 to 6 carbon atoms, and at least any one of A and B is a phenyl group; and wherein all of A, B, C, and D may be a phenyl group; and wherein each of the sites constituted of Si.A.B.O and the sites constituted of Si.C.D.O is arbitrary with respect to the position and arrangement and is of a random polymer type; and wherein X is selected from the group consisting of a methoxy group, an ethoxy group, a hydroxyl group, a halogen atom, and a carboxy group, and when c is 2 or more, each X may be the same of different from every other X, and the surface-modifying material containing a hydrogen group is one or more kinds selected from the group consisting of triethoxysilane, dimethylethoxysilane, diethoxymethylsilane, dimethylchlorosilane and ethyldichlorosilane.

2. A dispersion liquid including the surface-modified metal oxide particle material according to claim 1 .

3. A silicone resin composition including the surface-modified metal oxide particle material according to claim 1 and a silicone resin-forming component containing at least one member from the group consisting of phenyl silicone resin-forming component and a methyl phenyl silicone resin-forming component, the silicone resin-forming component having at least one member selected from the group consisting of an alkenyl group and an alkynyl group.

4. The silicone resin composition according to claim 3 , wherein the metal oxide particle is contained in an amount of 5% by mass or more.

5. The silicone resin composition according to claim 3 , further including a hydrosilylation catalyst.

6. A silicone resin composite obtained by curing the silicone resin composition according to claim 3 .

7. An optical semiconductor light emitting device comprising a semiconductor light emitting element sealed with a sealing material, wherein the sealing material is composed of the silicone resin composite according to claim 6 , and a sealing layer made of the sealing material has a thickness of 50 μm or more.

8. A light fitting comprising the optical semiconductor light emitting device according to claim 7 .

9. A liquid crystal imaging device comprising the optical semiconductor light emitting device according to claim 7 .