Curable Silicon Composition, Cured Product Thereof, And Optical Semiconductor Device

A curable silicone composition comprising at least:

• (A) an organopolysiloxane represented by the following average unit formula:
• (R113SiO1/2)a(R112SiO2/2)b(R21SiO3/2)c(SiO4/2)d
• wherein, R11 are each independently alkyl groups, alkenyl groups, or phenyl groups;
• R21 is a group recited for R11, a condensed polycyclic aromatic group, or a group containing a condensed polycyclic aromatic group, provided that at least one of R11 or R21 in a molecule is an alkenyl group, and at least one R21 in a molecule is a condensed polycyclic aromatic group or a group containing a condensed polycyclic aromatic group;
• and a, b, c, and d are numbers satisfying:
• 0.01≦a≦0.8, 0≦b≦0.5, 0.2≦c≦0.9, 0≦d<0.2, and a+b+c+d=1;
• (B) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule;
• and
• (C) a hydrosilylation reaction catalyst.

A curable silicone composition comprising at least:

• (D) an organopolysiloxane represented by the following average unit formula:
• (R123SiO1/2)a(R122SiO2/2)b(R22SiO3/2)c(SiO4/2)d
• wherein, R12 are each independently alkyl groups, phenyl groups, or hydrogen atoms;
• R22 is a group recited for R12, a condensed polycyclic aromatic group, or a group containing a condensed polycyclic aromatic group, provided that at least one of R12 or R22 in a molecule is a hydrogen atom, and at least one R22 in a molecule is a condensed polycyclic aromatic group or a group containing a condensed polycyclic aromatic group;
• and a, b, c, and d are numbers satisfying:
• 0.01≦a≦0.8, 0≦b≦0.5, 0.2≦c≦0.9, 0≦d<0.2, and a+b+c+d=1;
• (E) an organopolysiloxane having at least two alkenyl groups in a molecule;
• and
• (C) a hydrosilylation reaction catalyst.

A curable silicone composition comprising at least:

• (A) an organopolysiloxane represented by the following average unit formula:
• (R113SiO1/2)a(R112SiO2/2)b(R21SiO3/2)c(SiO4/2)d
• wherein, R11 are each independently alkyl groups, alkenyl groups, or phenyl groups;
• R21 is a group recited for R11, a condensed polycyclic aromatic group, or a group containing a condensed polycyclic aromatic group, provided that at least one of R11 or R21 in a molecule is an alkenyl group, and at least one R21 in a molecule is a condensed polycyclic aromatic group or a group containing a condensed polycyclic aromatic group;
• and a, b, c, and d are numbers satisfying:
• 0.01≦a≦0.8, 0≦b≦0.5, 0.2≦c≦0.9, 0≦d<0.2, and a+b+c+d=1;
• (D) an organopolysiloxane represented by the following average unit formula:
• (R123SiO1/2)a(R122SiO2/2)b(R22SiO3/2)c(SiO4/2)d
• wherein, R12 are each independently alkyl groups, phenyl groups, or hydrogen atoms;
• R22 is a group recited for R12, a condensed polycyclic aromatic group, or a group containing a condensed polycyclic aromatic group, provided that at least one of R12 or R22 in a molecule is a hydrogen atom, and at least one R22 in a molecule is a condensed polycyclic aromatic group or a group containing a condensed polycyclic aromatic group;
• and a, b, c, and d are numbers satisfying:
• 0.01≦a≦0.8, 0≦b≦0.5, 0.2≦c≦0.9, 0≦d<0.2, and a+b+c+d=1;
• and
• (C) a hydrosilylation reaction catalyst.