| abstract |
(A) an organopolysiloxane having at least two silicon-bonded alkenyl groups in one molecule, (B) an organopolysiloxane having at least two silicon-bonded alkenyl groups in one molecule, There is provided a curable silicone composition consisting essentially of an organohydrogenpolysiloxane having at least two silicon atom-bonded hydrogen atoms, (C) a triazole compound, (D) a metal-based condensation reaction catalyst, and (E) a hydrosilylation reaction catalyst . Further, there is provided an optical semiconductor device excellent in reliability after a moisture absorption reflow test in which an optical semiconductor element is sealed or covered with a cured product of the composition. |