The present invention relates to the flat light emitting OELDs device surface-illuminating with various light by the organic light-emitting device(OLEDs). It relates to the flat light emitting device by the multiple transparent organic light emitting device, which if the independent transparent organic light emitting devices radiating different primary color light of red light(R), green light(G) and blue light(B) which is the typical primary color light are manufactured seperatively and arranged in stacked form and are power-supplied, the multiple transparent organic light emitting device is made, which enables light emit forward backward by radiating three-band light, if light is concentrated into focus in a fixed direction by using a reflector etc., various colors of lights is made forward, and if each brightness is regulated, substantial three band white light or various lights can be observed forward Particularly, it relates to the surface light source organic light-emitting device(OLEDs) apparatus which is suitable for the surface light source white light backlight unit (Backlight Unit: BLU) and lighting device.
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