Patent ID: 7005229

Claim:
A method of multiphoton photosensitizing comprising the steps of (a) providing a multiphoton-activatable, photoreactive composition comprising (1) at least one reactive species that is capable of undergoing an acid- or radical-initiated chemical reaction, and (2) a photoinitiator system comprising photochemically-effective amounts of (i) at least one type of semiconductor nanoparticle that has at least one electronic excited state that is accessible by absorption of two or more photons, and (ii) a composition that is capable of interacting with said excited state of said semiconductor nanoparticle to form at least one reaction-initiating species; and (b) irradiating said multiphoton-activatable, photoreactive composition with light sufficient to cause absorption of at least two photons, thereby inducing at least one acid- or radical-initiated chemical reaction where said composition is exposed to the light.