Fluorescing Materials for 3D Memory Devices

Background: Photochromic fulgides are capable of reversible light-induced coloration. These organic compounds exhibit several important physical properties such as thermal stability of both colorless and colored forms, high photoreaction efficiency, high fatigue resistance to repeated coloration-bleaching cycles and light power. Photochromic fulgides are therefore promising candidates for many technological applications including use in recording media, particularly in erasable optical memory devices.

In order to be useful as 3D optical memory device materials the colored form of the photochromic materials will fluoresce when illuminated with light. Heteroclic photochromic fulgides have been synthesized but they do not fluoresce in either their colored or colorless forms. Technology: This invention presents a new class of thermally stable and fatigue resistant photochemical consisting of colored fluorescent heteroclic fulgides that can be induced to fluoresce by radiation of an appropriate frequency which are particularly suitable for optical memories. These fluorescent photochromic fulgides exhibit all of the important physical properties of photochromic fulgides:
a) thermal stability of both colorless and colored forms b) high photoreaction stability c) high fatigue resistance to repeated coloration-bleaching cycles d) strongly fluorescent in one stable form.
Application: Optical memory, rewriteable optical memory

Patents:
US 6,693,201

Type of Offer: Licensing



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