| abstract |
4-cyanocoumarin derivatives have remarkable sensitivity to visible light and remarkable luminescence, and are useful for photochemical polymerization, dye lasers and organic electroluminescence.n n n 4-cyanocoumarin derivatives according to the present invention are most useful as light emitting agents for organic EL devices for emitting visible light in the red region because most of them have the largest fluorescence at 600 to 650 nm, particularly at wavelengths of 610 to 630 nm. |