The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 2009
Filed:
May. 11, 2004
Reza Stegamat, Milpitas, CA (US);
Vi-en Choong, San Jose, CA (US);
Reza Stegamat, Milpitas, CA (US);
Vi-En Choong, San Jose, CA (US);
Osram Opto Semiconductors GmbH, Regensburg, DE;
Abstract
In a first embodiment of the present invention, in order to increase the number of holes injected into the emissive layer, an intermixed layer is formed from the intermixing of the hole transport layer ('HTL') and the emissive layer. The intermixed layer is between the HTL and the emissive layer of the OLED device. Alternatively, in a second embodiment of the present invention, in order to increase the number of holes injected into the emissive layer, a separate interlayer is incorporated within the OLED device. The interlayer is comprised of a hole transport material in which one of its components is at least partially replaced with one of the components of the emissive layer that is responsible for hole injection and transport. The separate interlayer is between the anode and the emissive layer of the OLED device. One or more intermediate layers may be present between the interlayer and the anode such as, for example, a HTL may be present between those two layers.