US 9,000,419 B2Granted

Organic electroluminescence element

AssigneesDai Nippon Printing Co., Ltd., Yamagata Promotional Organization for Industrial Technology

InventorsYasuhiro Iizumi, Atsushi Oda, Junji Kido, Toshitaka Mori

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Abstract

An organic EL element which has no layer that prevents penetration of holes and electrons to the counter electrode. The organic EL element includes: an anode, a hole injecting and transporting layer formed on the anode, a light emitting layer formed on the hole injecting and transporting layer, an electron injecting and transporting layer formed on the light emitting layer, and a cathode formed on the electron injecting and transporting layer. Ip2≧Ip3 is established when an ionization potential of a constituent material for the light emitting layer is Ip2 and an ionization potential of a constituent material for the electron injecting and transporting layer is Ip3. Ea1≧Ea2 is established when an electron affinity of a constituent material for the hole injecting and transporting layer is Ea1 and an electron affinity of the constituent material for the light emitting layer is Ea2.

Claims20

Dependent claims

An organic electroluminescence element comprising:

an anode,
a hole injecting and transporting layer formed on the anode,
a light emitting layer formed on the hole injecting and transporting layer,
an electron injecting and transporting layer formed on the light emitting layer, and
a cathode formed on the electron injecting and transporting layer,
wherein a relation of Ip2≧Ip3 is established when an ionization potential of a constituent material for the light emitting layer is Ip2 and an ionization potential of a constituent material for the electron injecting and transporting layer is Ip3, and
a relation of Ea1=Ea2 is established when an electron affinity of the constituent material for the hole injecting and transporting layer is Ea1 and an electron affinity of the constituent material for the light emitting layer is Ea2,
wherein a second hole injecting and transporting layer is formed between the hole injecting and transporting layer and the light emitting layer,
wherein a relation of Ea1=Ea4=Ea2 is established when an electron affinity of a constituent material for the second hole injecting and transporting layer is Ea4, and
a relation of Ip1<Ip4<Ip2 is established when an ionization potential of the constituent material for the second hole injecting and transporting layer is Ip4 and an ionization potential of the constituent material for the hole injecting and transporting layer is Ip1, and
wherein the constituent material for the hole injecting and transporting layer, the constituent material for the light emitting layer, and the constituent material for the second hole injecting and transporting layer are different materials.

8 more elements

An organic electroluminescence element comprising:

plural light emitting units, which respectively having a hole injecting and transporting layer, a light emitting layer and an electron injecting and transporting layer sequentially laminated, between an anode and a cathode facing each other;
and
a charge generating layer formed between adjacent light emitting units,
wherein a relation of Ip2≧Ip3 is established when an ionization potential of a constituent material for the light emitting layer is Ip2 and an ionization potential of a constituent material for the electron injecting and transporting layer is Ip3, and
a relation of Ea1=Ea2 is established when an electron affinity of a constituent material for the hole injecting and transporting layer is Ea1 and an electron affinity of the constituent material for the light emitting layer is Ea2,
wherein a second hole injecting and transporting layer is formed between the hole injecting and transporting layer and the light emitting layer, and
wherein a relation of Ea1=Ea4=Ea2 is established when an electron affinity of a constituent material for the second hole injecting and transporting layer is Ea4, and
a relation of Ip1<Ip4<Ip2 is established when an ionization potential of the constituent material for the second hole injecting and transporting layer is Ip4 and an ionization potential of the constituent material for the hole injecting and transporting layer is Ip1, and
wherein the constituent material for the hole injecting and transporting layer, the constituent material for the light emitting layer, and the constituent material for the second hole injecting and transporting layer are different materials.

6 more elements

An organic electroluminescence element comprising:

an anode,
a hole injecting and transporting layer formed on the anode,
a light emitting layer formed on the hole injecting and transporting layer,
an electron injecting and transporting layer formed on the light emitting layer, and
a cathode formed on the electron injecting and transporting layer,
wherein a relation of Ip2=Ip3 is established when an ionization potential of a constituent material for the light emitting layer is Ip2 and an ionization potential of a constituent material for the electron injecting and transporting layer is Ip3, and
a relation of Ea1≧Ea2 is established when an electron affinity of a constituent material for the hole injecting and transporting layer is Ea1 and an electron affinity of the constituent material for the light emitting layer is Ea2,
wherein a second electron injecting and transporting layer is formed between the electron injecting and transporting layer and the light emitting layer,
wherein a relation of Ip2=Ip5=Ip3 is established when an ionization potential of a constituent material for the second electron injecting and transporting layer is Ip5, and
a relation of Ea2<Ea5<Ea3 is established when an electron affinity of the constituent material for the second electron injecting and transporting layer is Ea5 and an electron affinity of the constituent material for the electron injecting and transporting layer is Ea3, and
wherein the constituent material for the light emitting layer, the constituent material for the electron injecting and transporting layer, and the constituent material for the second electron injecting and transporting layer are different materials.

8 more elements

An organic electroluminescence element comprising:

plural light emitting units, which respectively having a hole injecting and transporting layer, a light emitting layer and an electron injecting and transporting layer sequentially laminated, between an anode and a cathode facing each other;
and
a charge generating layer formed between adjacent light emitting units,
wherein a relation of Ip2=Ip3 is established when an ionization potential of a constituent material for the light emitting layer is Ip2 and an ionization potential of a constituent material for the electron injecting and transporting layer is Ip3, and
a relation of Ea1≧Ea2 is established when an electron affinity of a constituent material for the hole injecting and transporting layer is Ea1 and an electron affinity of the constituent material for the light emitting layer is Ea2,
wherein a second electron injecting and transporting layer is formed between the electron injecting and transporting layer and the light emitting layer,
wherein a relation of Ip2=Ip5=Ip3 is established when an ionization potential of a constituent material for the second electron injecting and transporting layer is Ip5, and
a relation of Ea2<Ea5<Ea3 is established when an electron affinity of the constituent material for the second electron injecting and transporting layer is Ea5 and an electron affinity of the constituent material for the electron injecting and transporting layer is Ea3, and
wherein the constituent material for the light emitting layer, the constituent material for the electron injecting and transporting layer, and the constituent material for the second electron injecting and transporting layer are different materials.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/527,224Filed 6 Feb 2008
Priority: JP 2007-03860019 Feb 2007
Published: US 2010/0096622 A122 Apr 2010
Granted: 7 Apr 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 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 50/155
Hole transporting layers: comprising dopants
H10K 50/165
Electron transporting layers: comprising dopants