US 7,466,074 B2Granted

Organic light-emitting device

AssigneeCanon Kabushiki Kaisha

InventorsKeiji Okinaka, Naoki Yamada, Akihito Saitoh

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Abstract

In an organic light-emitting device which uses, in particular, a light-emitting layer material having a wide band gap, a lowering in emission intensity due to continuous driving is alleviated while maintaining a high emission efficiency. There is provided an organic light-emitting device in which a hole-transporting layer contains a second component in addition to a main component; an energy of a lowest triplet excited state of the second component is less than an energy of a lowest triplet excited state of the main component of the hole-transporting layer; a lowest unoccupied molecular orbital energy of the second component is higher than a lowest unoccupied molecular orbital energy of the main component of a light-emitting layer; and the second component has an energy gap of 2.7 eV or more.

Claims5

Dependent claims

An organic light-emitting device comprising a pair of electrodes including an anode and a cathode;

and a light-emitting layer and a hole-transporting layer disposed between the pair of electrodes, an energy gap E1 of a main component of the light-emitting layer and an energy gap E2 of a main component of the hole-transporting layer satisfying the relationship of E2−E1≦0.3 eV,
wherein the hole-transporting layer comprises a second component in addition to the main component of the hole-transporting layer;
(1) an energy of a lowest triplet excited state of the second component is less than an energy of a lowest triplet excited state of the main component of the hole-transporting layer;
(2) a lowest unoccupied molecular orbital energy of the second component is higher than a lowest unoccupied molecular orbital energy of the main component of the light-emitting layer;
and
(3) the second component has an energy gap of 2.7 eV or more.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/548,893Filed 12 Oct 2006
Priority: JP 2005-36261116 Dec 2005
Published: US 2007/0205713 A16 Sep 2007
Granted: 16 Dec 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H10K 50/11
OLEDs or polymer light-emitting diodes [PLED]: characterised by the electroluminescent [EL] layers
H10K 50/14
OLEDs or polymer light-emitting diodes [PLED]: carrier transporting layers
H10K 85/626
Polycyclic condensed aromatic hydrocarbons, e.g. anthracene: containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
H10K 85/633
Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine: comprising polycyclic condensed aromatic…

Family

US 2007/0205713 A1Pre-grant publication · published 6 Sep 2007
US 7,466,074 B2This patent

From the US filing history. Foreign family members aren’t listed.

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