Patent ID: 7843129

Claim:
A white organic light emitting device comprising: a substrate; an anode formed on the substrate; a hole transport layer formed on the anode; a light emitting layer formed on the hole transport layer, the light emitting layer comprising: a red light emitting layer emitting red light; a blue light emitting layer formed on the red light emitting layer and emitting blue light; a green light emitting layer formed on the blue light emitting layer and emitting green light; and a first functional layer formed between the red light emitting layer and the blue light emitting layer and a second functional layer formed between the blue light emitting layer and the green light emitting layer, the first and second functional layers blocking an energy transfer and controlling charge movement between the red light emitting layer and the blue light emitting layer and between the blue light emitting layer and the green light emitting layer, respectively, the first functional layer having a thickness of about 50 angstrom to about 100 angstrom, the second functional layer having an electron transport characteristic, the second functional layer having an energy band gap greater than an energy band gap of the blue light emitting layer, the second functional layer having a highest occupied molecular orbital (HOMO) level lower than a HOMO level of the blue light emitting layer; an electron transport layer formed on the light emitting layer; and a cathode formed on the electron transport layer.