Low gas permeable silicone resin composition and optoelectronic device

A low gas permeable silicone resin composition comprising

• (A) 20 to 95 parts by weight of an organopolysiloxane containing at least two alkenyl groups in a molecule, having the average compositional formula (1):
• (R1SiO3/2)a(R22SiO)b(R1R2R3SiO1/2)c (1)
• wherein R1 is each independently C6-C14 aryl, R2 which may be the same as or different from R2 is each independently a substituted or unsubstituted, monovalent hydrocarbon group, R3 is C2-C8 alkenyl, a is a positive number of 0.3 to 0.9, b is a positive number of 0 to 0.5, c is a positive number of 0.05 to 0.7, and a+b+c=1.0,
• (B) 0.01 to 40 parts by weight of an organohydrogenpolysiloxane containing at least two silicon-bonded hydrogen atoms in a molecule, having the average compositional formula (2):
• R1dR2eHfSiO(4-d-e-f)/2 (2)
• wherein R1 and R2 are as defined above, d is a positive number of 0.6 to 1.5, e is a positive number of 0 to 0.5, f is a positive number of 0.4 to 1.0, and d+e+f=1.0 to 2.5, and
• (C) a catalytic amount of an addition reaction catalyst.