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Phosphorescent organic light emitting devices

a light-emitting device and organic technology, applied in the direction of discharge tube luminescnet screen, other domestic articles, natural mineral layered products, etc., can solve the problem that it is not believed that organic materials can be used to produce efficient room temperature electrophosphorescence, and achieve the effect of preventing significant non-radiative energy loss to the host and significant non-radiative energy loss

Inactive Publication Date: 2011-07-19
UNIV OF SOUTHERN CALIFORNIA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration achieves high external quantum efficiency and power luminous efficiency, with maximum external quantum efficiency of 15.4% and power efficiency of 40 lm / W, by confining charge carriers and triplet excitons within a thin emissive layer, reducing non-radiative losses and enhancing radiative emission.

Problems solved by technology

Until recently, it was not believed that organic materials could be used to produce efficient room temperature electrophosphorescence.

Method used

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  • Phosphorescent organic light emitting devices
  • Phosphorescent organic light emitting devices
  • Phosphorescent organic light emitting devices

Examples

Experimental program
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Effect test

example 1

[0101]A hole transporting layer (“HTL”) is first deposited onto the ITO (indium tin oxide) coated glass substrate. The HTL consists of 30 nm (300 Å) of NPD. A first electron transporting layer, which is also a blocking layer, consisting of TAZ, having a thickness of about 20 nm (200 Å) is deposited onto the HTL layer. The first electron transporting layer is doped with Ir(ppy)3. A second electron transport layer of Alq3 having a thickness of about 20 nm is deposited onto the first electron transporting layer. The device is finished by depositing a Mg—Ag electrode onto the second electron transporting layer. This Mg-Ag electrode has of thickness 100 nm. All of the depositions are carried out at a vacuum less than 5×10−5 Torr. The devices are tested in air, without packaging.

[0102]When a voltage is applied between the cathode and the anode, holes are injected from ITO to NPD and transported by the NPD layer, while electrons are injected from MgAg to Alq3 and transported through Alq3. ...

example 2

[0103]Organic layers were deposited by high vacuum (10−6 Torr) thermal evaporation onto a clean glass substrate precoated with an ITO layer. A 60 nm-thick film of 4,4′-bis[N,N′-(3-tolyl)amino]-3,3′-dimethylbiphenyl (HMTPD) serves as the HTL. Next a 25 nm-thick EML consisting of 6% to 8% Ir(ppy)3 is doped into various electron transporting hosts via thermal co-deposition. A 50 nm-thick layer of the electron transport material tris-(8-hydroxyquinoline) aluminum (Alq3) is used to transport and inject electrons into the EML. A shadow mask with 1 mm-diameter openings was used to define the cathode consisting of a 150 nm-thick magnesium silver (Mg—Ag) layer, with a 20 nm-thick Ag cap. Alternatively, the cathode consisted of a 100 nm-thick layer of aluminum-0.56wt % lithium.

[0104]Current density (J) versus voltage (V) measurements were obtained using a semiconductor parameter analyzer, with the luminance (L) obtained by placing the OLEDs directly onto the surface of a calibrated silicon ph...

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Abstract

An organic light emitting device structure having an organic light emitting device (OLED) over a substrate, where the OLED has, for example, an anode, a hole transporting layer (HTL), a first electron transporting layer (ETL) that is doped with a phosphorescent material, a second electron transporting layer (ETL), and a cathode. The OLEDs of the present invention are directed, in particular, to devices that include an emissive layer comprised of an electron transporting host material having a triplet excited state energy level that is higher than the emissive triplet excited state energy level of the phosphorescent dopant material.

Description

[0001]The present application claims the benefit under 35 U.S.C. 119(e) of provisional application 60 / 207,330, filed May 30, 2000.GOVERNMENT RIGHTS[0002]This invention was made with Government support under Contract No. F33615-94-1-1414 awarded by DARPA. The government has certain rights in this invention.FIELD OF THE INVENTIONResearch Agreements[0003]The claimed invention was made by, on behalf of, and / or in connection with one or more of the following parties to a joint university-corporation research agreement: Princeton University, The University of Southern California, and Universal Display Corporation. The agreement was in effect on and before the date the claimed invention was made, and the claimed invention was made as a result of activities undertaken within the scope of the agreement.<?insert-end id="INS-S-00001" ?>[0004]The present invention provides high efficiency phosphorescent organic light emitting devices. The present invention relates, for example, to an orga...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H05B33/14H01L51/54H10K99/00
CPCY10S428/917H10K85/60H10K85/656H10K85/6572H10K85/341H10K50/11H10K2101/40H10K2101/10H10K50/14
Inventor ADACHI, CHIHAYABALDO, MARC A.FORREST, STEPHEN R.
Owner UNIV OF SOUTHERN CALIFORNIA
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