WHITE LIGHT-EMITTING ORGANIC ELECTROLUMINESCENT ELEMENT AND WHITE LIGHT-EMITTING ORGANIC ELECTROLUMINESCENT PANEL
摘要
<p>Provided is a highly efficient white light-emitting organic electroluminescent element which has reduced viewing angle dependency. This white light-emitting organic electroluminescent element contains, between the positive electrode and the negative electrode, at least four kinds of light-emitting dopants that have different emission peak wavelengths. The emission peak wavelengths of the four kinds of light-emitting dopants are longer in the order of a light-emitting dopant A, a light-emitting dopant B, a light-emitting dopant C and a light-emitting dopant D. The emission spectrum satisfies the following relations: the luminance average value for 50-70 degrees/front luminance (at the emission peak wavelength of the light-emitting dopant A) > the luminance average value for 50-70 degrees/front luminance (at the emission peak wavelength of the light-emitting dopant D); and the luminance average value for 50-70 degrees/front luminance (at the emission peak wavelength of the light-emitting dopant C) > the luminance average value for 50-70 degrees/front luminance (at the emission peak wavelength of the light-emitting dopant B).</p>
