OLEDS WITH IMPROVED LIGHT EXTRACTION USING ENHANCED GUIDED MODE COUPLING

摘要

An organic light emitting diode (OLED) device having enhanced light extraction is disclosed. The OLED device includes an upper waveguide structure having an organic layer and supports first guided modes, and a lower waveguide structure with a light-extraction waveguide that supports second guided modes substantially matched to the first guided modes. The lower waveguide structure includes a light-extraction waveguide interfaced with a light-extraction matrix. The light-extraction waveguide includes one or more light-redirecting features. The upper and lower waveguide structures are configured to facilitate mode coupling from the first guided modes to the second guide modes while substantially avoiding coupling the first guided modes to surface plasmon polaritons. The light traveling in the second guided modes is redirected to exit the OLED device by light-redirecting features of the light-extraction waveguide.

主权项

1. An organic light emitting diode (OLED) device having enhanced light extraction, comprising:
an upper waveguide structure that supports first guided modes and comprising a cathode, an anode with a lower surface, and an organic light-emitting semiconductor material interposed between the cathode and the anode; a lower waveguide structure interfaced with the upper waveguide structure and that supports second guided modes substantially matched to the first guided modes, the lower waveguide structure comprising a substrate having an upper surface, a light-extraction waveguide distributed over an upper surface of the substrate, and a light-extraction matrix distributed over the light-extraction waveguide and the upper surface of the substrate; wherein the light-extraction matrix includes a rough upper surface that interfaces with the lower surface of the anode and that facilitates mode coupling from the first guided modes of the upper waveguide structure to the second guided modes of the lower waveguide structure while substantially avoiding coupling from the first guided modes to surface plasmon polaritons; and wherein light traveling as second guided modes in the light-extraction waveguide of the lower waveguide structure is redirected to exit the lower surface of the substrate by light-redirecting features of the lower waveguide structure.