Organic light-emitting device
AssigneeSamsung Display Co., Ltd.
InventorsJun-Yeob Lee, Min-Seung Chun, Yong-Joong Choi
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Abstract
An organic light-emitting device is provided. The organic light-emitting device comprises a first electrode, a second electrode, and a light-emitting layer interposed between the first electrode and the second electrode. The device further comprises of a phosphorescent dopant and a phosphorescent host that includes at least two hole transport materials. The mixed phosphorescent host materials increase energy transfer efficiency, thereby improving the efficiency and lifespan of the resulting organic light-emitting device.
Claims8
An organic light-emitting device, comprising:
- a first electrode;
- a second electrode;
- and
- a light-emitting layer interposed between the first electrode and the second electrode,
- wherein the light-emitting layer consists of a phosphorescent dopant and two phosphorescent hosts,
- wherein the two phosphorescent hosts are
- 4,4′-biscarbazolylbiphenyl (CBP) and 4,4′-biscarbazolyl-2,2′-dimethylbiphenyl (dmCBP), and
- wherein CBP and dmCBP are combined in a weight ratio of about 1:3 to about 3:1.
An organic light-emitting device, comprising:
- a first electrode;
- a second electrode;
- and
- a light-emitting layer interposed between the first electrode and the second electrode;
- wherein the light-emitting layer consists of:
- a phosphorescent dopant;
- a first phosphorescent host having a triplet energy of about 2.3 eV to about 3.5 eV;
- and
- a second phosphorescent host having a triplet energy of about 2.3 eV to about 3.5 eV,
- wherein the first phosphorescent host and the second phosphorescent host have different highest occupied molecular orbital (HOMO) energy levels and/or different lowest unoccupied molecular orbital (LUMO) energy levels,
- wherein the phosphorescent dopant is one material selected from the group consisting of bis(thienylpyridine) acetylacetonate iridium and bis(1-phenylisoquinoline)iridium acetylacetonate,
- wherein the first phosphorescent host and the second phosphorescent host are combined in a weight ratio of about 1:3 to about 3:1, and
- wherein the first phosphorescent host is 4,4′-biscarbazolylbiphenyl (CBP) and the second phosphorescent host is 4,4′-biscarbazolyl-2,2′-dimethylbiphenyl (dmCBP).
Dependencies are inferred from the claim text.