White light emitting element

Abstract

This invention provides a white light emitting element having a prolonged lifetime that can emit white light having high color purity. The white light emitting element comprises: opposed electrodes 3, 4; a luminescent layer A comprising an organic material and/or inorganic nanoparticles that emit light by EL; a luminescent layer B comprising inorganic nanoparticles that emit light by PL; and opposed reflective layers 5, 6 that allow light generated in the luminescent layer A to resonate within the element, light generated in the luminescent layer A and light generated in the luminescent layer B together producing white light, wherein one of the opposed electrodes 3, 4 or a layer adjacent to the electrodes has a total reflection function and is provided as one of the reflective layers, and the other electrode or a layer adjacent to the other electrode has a semi-transparent reflection function and is provided as the other reflective layer.

Dependencies are inferred from the claim text.