Compositions and their hardened forms, molded products, display devices, and solid-state imaging elements

Abstract

This invention provides a composition capable of forming a hardened material exhibiting a high refractive index and excellent resistance to yellowing, thereby possessing good storage stability. This invention provides a composition comprising: compound (A) having a cyclothioethanediyl or cyclothiopropanediyl group; an acid-generating agent (B); and a triarylphosphine compound (C).