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:
Jan. 04, 2011
Filed:
Aug. 23, 2004
LI LI, Ottawa, CA;
Jerzy Dobrowolski, Ottawa, CA;
Daniel Poitras, Ottawa, CA;
National Research Council of Canada, Ottawa, Ontario, CA;
Abstract
An organic light emitting device consists of a layered structure including a top multilayer stack, a bottom multilayer stack, a cavity layer between the top multilayer stack and the bottom multilayer stack, and an organic light emitting region within the cavity layer. The layered structure is constructed such that the product of phase factors ξand ξis. greater than 80% at the center of at least one emitting wavelength region and for a normal viewing angle, wherein where Rand Rare the reflectance of the top and bottom multilayer stacks respectively, φand φare the phase changes on reflection for the top and bottom multilayer stacks respectively, αβare respectively the real and imaginary parts of the phase thickness of the cavity layer, αand βare respectively the real and imaginary parts of the phase thickness of the light-emitting region at the operating wavelength of the device, x is the mean distance of light emitting region from the bottom multilayer stack, n and k are the refractive index and absorption coefficient of the cavity layer, θis the emitting angle inside the cavity layer, and d is the physical thickness of said cavity layer. This condition improves the light output efficiency of the device.