Patent ID: 8513648

Claim:
A lighting fixture comprising: a light emitting device that is a light source, the light emitting device comprising an organic light emitting element over a substrate, the organic light emitting element comprising: an anode; a cathode; and an organic compound film containing a hole transporting material and an electron transporting material; wherein the organic compound film has a structure which comprises in a direction from the anode to the cathode: a hole transporting region made from the hole transporting material; a first concentration change region in which a proportion of the electron transporting material increases gradually until a ratio between the hole transporting material and the electron transporting material becomes x:y (where x and y are positive constants); a mixture region containing the hole transporting material and the electron transporting material at the ratio of x:y; a second concentration change region in which a proportion of the electron transporting material gradually increases further from the x:y ratio; and an electron transporting region made from the electron transporting material; and wherein a light emitting region, into which a light emitting material for performing light emission is added, is formed within the mixture region.