High optical contrast resin composition and electronic package utilizing same

An electronic package comprising a dielectric layer and at least one conductive layer positioned on or within said dielectric layer, said dielectric layer including a composition of reinforcing material, a resin material, a coloring agent, and a fluorescing agent;

• wherein said resin material is selected from the group consisting of epoxy, cyanate, and bismaleimide resins;
• and
• wherein said epoxy polymer resin comprises epoxides derived from mononuclear and polynucleur dihydric phenols, said cyanate resin comprising a polyfunctional cyanate ester monomer or prepolymer having the formula R—(—O—C N)m, where m=2-5 and R is an aromatic organic group, the cyanate groups being bonded to an aromatic ring of said aromatic organic group;
• and
• wherein said bismaleimide resin comprises a polyfunctional maleimide resin selected from the group consisting of 1,3- or 1,4-dimaleimide benzene,
• 1,3- or 1,4-bis(maleimide methylene)benzene, 1,3- or 1,4-dimaleimide
• cyclohexane, 1,3- or 1,4-bis(maleimide methylene)cyclohexane,
• 4,4′-dimaleimide biphenyl, bis(4-maleimidephenyl)methane,
• bis(4-maleimidephenyl)ether, bis(4-maleimidephenyl sulfone,
• bis(4-maleimide-3-methylphenyl)methane,
• bis(4-maleimide-3-chlorophenyl)methane,
• bis(4-maleimide-3,5-dimethyl phenyl)methane,
• 2,2′-bis(4-maleimide-3-methylphenyl)propane,
• 2,2′-bis(4-maleimide-3,5-dibromophenyl)propane,
• bis(4-maleimidephenyl)phenylmethane,
• 3,4-dimaleimidephenyl-4′-maleimidephenylmethane,
• 1,1′-bis(4-maleimide-phenyl)-1-phenylmethane, and maleimide.