A method of determining whether a substrate has been subjected to an energy source. In one embodiment, the method includes the steps of providing a polymeric surface, providing a light emitting material having a specified emission spectrum that changes upon exposure to an energy source on the surface or embedded in said substrate and applying said energy source to said surface with said light emitting material. This method can be particularly useful for detecting the bond quality in medical devices.
New fluorescent oxazolone derivatives with high two-photon absorption cross-section were synthesized. Electron donor (phenyl, dimethylaniline and furanyl) and acceptor (nitrobenzene and ethenyl-phenyl-benzimidazol) groups have been appended to the methylene end of 4-(methylidene)-2-phenyl-1,3-oxazol-5(4H)-one in order to produce an highly conjugated pi-system with push pull geometry. The linear and nonlinear optical properties of the oxazolones have been determined. The compounds with a high charge transfer from the substituent group to the oxazolone ring have relatively high two-photon absorption cross-sections (80-100 GM). The best performing nonlinear fluorophore being the benzimidazol derivative with a two-photon absorption cross-section of 80 GM and a relatively high emission quantum yield, phi = 0.31. (c) 2012 Elsevier Ltd. All rights reserved.
CURE-INDICATING MOLDING AND COATING COMPOSITION
申请人:MINNESOTA MINING AND MANUFACTURING COMPANY
公开号:EP0767809B1
公开(公告)日:2004-01-21
DENTAL IMPRESSION MATERIAL WITH CURE-INDICATING DYE