ORGANIC ELECTROLUMINESCENCE ELEMENT AND LIGHTING DEVICE

摘要

The organic electroluminescence element includes: a light transmissive moisture-proof substrate; a light emitting stack including a light transmissive first electrode, a light emitting layer for emitting at least two rays of light with different emission wavelengths, and a second electrode which are arranged in this order from the moisture-proof substrate; and an enclosing member bonded to the moisture-proof substrate to enclose the light emitting stack. The organic electroluminescence element further includes a light-outcoupling structure provided on a side of the moisture-proof substrate facing the first electrode and having an uneven structure made of material having a refractive index almost equal to or lower than a refractive index of the moisture-proof substrate. The uneven structure includes a plane divided into a matrix of sections to be protruded or recessed, and multiple protruded parts having almost same heights individually allocated to desired sections of the matrix so as to be arranged in the plane. In the uneven structure, with regard to an arbitrary region of the plane, a ratio of a total area of one or some of the multiple protruded parts in the arbitrary region to an area of the arbitrary region is almost constant.