Patent ID: 7345304

Claim:
A manufacturing method of an emitter having a plurality of types of light-emitting units with different changes in emission characteristics over time, the method comprising a deterioration adjustment step of adjusting deterioration of the emission characteristics over time in a predetermined type of light-emitting unit, wherein the emitter comprises red, green and blue light-emitting units; the red green and blue light-emitting units respectively have a light-emitting layer and a hole donor which supplies positive holes to the light-emitting layer; and the thickness of the hole donor is adjusted in the deterioration adjustment step based on the deterioration of emission characteristics over time in the predetermined type of light-emitting unit such that a thickness of the hole donor of the red light-emitting unit and a thickness of the hole donor of the green light-emitting unit are adjusted to be thinner than a thickness of the hole donor of the blue light-emitting unit.