A light emitting element and a display device using the light emitting element

The present invention provides a light emitting device and a display device using the light emitting element. A light emitting element comprising: a reflective electrode (3); a transparent electrode (9), which is the reflective electrode (3) arranged opposite to the incident light transmissive; a light emitting layer (7B), which is arranged on the reflective electrode (3) and the transparent electrode between (9), emits blue light; functional layer comprising a reflective electrode disposed on (3) and a light emitting layer (7b) between one or two or more layers; and a transparent color filter 12b, which via electrode (9) disposed on the side opposite to the light-emitting layer (7b), the optical thickness of the functional layer is 218nm or more and 238nm or less. Accordingly, to improve both the light-extraction efficiency and color purity of the luminescent color.