FILM, TEMPERATURE HISTORY RECORDING BODY AND DUAL-WAVELENGTH LIGHT-EMITTING ELEMENT

摘要

PROBLEM TO BE SOLVED: To obtain a new film having hysteresis of fluorescent wavelength depending upon temperature, a reversible high-sensitivity temperature history recording body and a dual-wavelength light-emitting element that emits light at different fluorescent wavelengths by one light source. SOLUTION: The film comprises a liquid-crystal compound that contains at least one electron donating group and at least one electron attractive group and exhibits fluorescence properties. The temperature history recording body has the film. The dual-wavelength light-emitting element has the film. COPYRIGHT: (C)2006,JPO&NCIPI