Organic el element and solution containing organic el material
AssigneeIdemitsu Kosan Co., Ltd.
InventorsKazuki Nishimura, Toshihiro Iwakuma, Kenichi Fukuoka, Chishio Hosokawa
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Abstract
An organic electroluminescence device includes: an anode; a cathode; and an organic thin-film layer interposed between the anode and the cathode. The organic thin-film layer includes a phosphorescent-emitting layer containing a host and a phosphorescent dopant. The host contains a first host and a second host. The first host includes a substituted or unsubstituted polycyclic fused aromatic skeleton, the skeleton having 10 to 30 ring-forming atoms not including an atom of a substituent. The second host has an affinity level greater than the affinity level of the first host.
Claims16
An organic electroluminescence device, comprising:
- an anode;
- a cathode;
- and
- an organic thin-film layer interposed between the anode and the cathode, wherein
- the organic thin-film layer includes a phosphorescent-emitting layer containing a host and a phosphorescent dopant,
- the host contains a first host and a second host,
- one of the first host and the second host exhibits a higher affinity level than the other,
- the first host includes a substituted or unsubstituted polycyclic fused aromatic skeleton, the skeleton having 10 to 30 ring-forming atoms not including an atom of a substituent,
- a minimum excited triplet energy gap of the first host is in a range from 2.1 eV to 2.7 eV.
An organic-electroluminescent-material-containing solution for preparing a phosphorescent-emitting layer comprising:
- a host;
- a phosphorescent dopant;
- and
- a solvent in which the host and the phosphorescent dopant are dissolved,
- wherein
- the host contains a first host and a second host,
- one of the first host and the second host exhibits a higher affinity level than the other,
- the first host includes a substituted or unsubstituted polycyclic fused aromatic skeleton, the skeleton having 10 to 30 ring-forming atoms not including an atom of a substituent, and a minimum excited triplet energy gap of the first host is in a range from 2.1 eV to 2.7 eV.
Dependencies are inferred from the claim text.