Patent ID: 7459263

Claim:
An optical recording material comprising: a polymeric matrix; a dewarbenzene derivative reactant capable of undergoing isomerization to a benzene product upon triplet excitation, thereby causing a change in optical properties; a sensitizer capable of absorbing actinic radiation to cause triplet energy transfer to said reactant, wherein the algebraic sum of the excitation energy of said sensitizer and its reduction potential is at least 0.05 eV less than the oxidation potential of said reactant, thereby precluding one-electron oxidation of said reactant and said sensitizer has a triplet energy of at least 45 kcal/mol and an intersystem crossing quantum yield of at least 0.2; and a triplet cosensitizer with a triplet energy between 45 and 72 kcal/mol present in an amount that absorbs less than 10 percent of the actinic radiation absorbed by said sensitizer and increases the quantum yield of isomerization by a factor of at least 1.57.