| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermosetting resin composition for an optical semiconductor device, which exhibits high initial reflectance for light even when the composition is molded into a thin form, and exhibits excellent long-term light fastness and resistance to discoloration by heating, and to provide a lead frame for an optical semiconductor device obtained by using the composition, and an optical semiconductor device.SOLUTION: The optical semiconductor device includes a metal lead frame composed of a first plate 1 and a second plate 2, and a reflector 4 formed to enclose an optical semiconductor element 3 mounted on the metal lead frame, having a thickness of 0.2 mm or less in a thinnest portion. The reflector 4 is made of a thermosetting resin composition for an optical semiconductor containing the following (A) and (B) components: (A) a thermosetting resin; and (B) zirconium oxide having a ratio (D95/D5) of 1 to 100, where D95 represents a grain size at 95% cumulative frequency in a cumulative grain size distribution in a cured product of the thermosetting resin, and D5 represents a grain size at 5% cumulative frequency. |
