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US 8,963,127 B2Granted
White organic light emitting device
AssigneeLG Display Co., Ltd.
InventorsSung-Hoon Pieh, Chang-Oh Kim
Life of this patent
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Abstract
A white organic light emitting device having a dual stack structure is disclosed, in which an electron transport layer adjacent to a blue light emitting layer includes an electron transport catalyst layer including metal to improve blue light emitting efficiency, and a greenish yellow dopant is used to improve white display efficiency, increase lifespan, and reduce power consumption.
Claims9
A white organic light emitting device comprising:
- an anode and a cathode facing each other on a substrate;
- a charge generation layer formed between the anode and the cathode;
- a first stack formed between the anode and the charge generation layer in a stack structure of a first hole transport layer, a first light emitting layer emitting blue, and a first electron transport layer;
- a second stack formed between the charge generation layer and the cathode in a stack structure of a second hole transport layer, a second light emitting layer, and a second electron transport layer, the second light emitting layer doped with a phosphor greenish yellow dopant having a single maximum peak wavelength in about 550 nm and a phosphor red dopant having a single maximum peak wavelength in about 610 nm in one host, and the second hole transport layer having an energy level higher than a triplet exciton energy level of the second light emitting layer;
- and
- an electron transport catalyst layer doped with metal oxide between the first electron transport layer and the charge generation layer,
- wherein the first electron transport layer is selected from a material that minimizes metal diffusion to the first light emitting layer, and the electron transport catalyst layer is selected from an organic material that enables electron injection through metal doping or metal oxide doping.
4 more elements
A white organic light emitting device comprising:
- an anode and a cathode facing each other on a substrate;
- a charge generation layer formed between the anode and the cathode;
- a first stack formed between the anode and the charge generation layer in a stack structure of a first hole transport layer, a first light emitting layer emitting blue, and a first electron transport layer;
- a second stack formed between the charge generation layer and the cathode in a stack structure of a second hole transport layer, a second light emitting layer, and a second electron transport layer, the second light emitting layer doped with first and second phosphor dopants in one host, the first and second phosphor dopants providing an emission spectrum with only two single peaks at, respectively, a wavelength of about 550 nm and a wavelength of about 610, and the second hole transport layer having an energy level higher than a triplet exciton energy level of the second light emitting layer;
- and
- an electron transport catalyst layer doped with metal oxide between the first electron transport layer and the charge generation layer,
- wherein the first electron transport layer is selected from a material that minimizes metal diffusion to the first light emitting layer, and the electron transport catalyst layer is selected from an organic material that enables electron injection through metal doping or metal oxide doping.
4 more elements
Dependencies are inferred from the claim text.