Light Extraction for OLED Lighting with 3-D Gradient Index

Lead Performer: Pixelligent Technologies LLC – Baltimore, MD
DOE Total Funding: $150,000
Project Term: February 21, 2017 – November 20, 2017
Funding Type: SBIR

PROJECT OBJECTIVE

The mismatches between the refractive indices (RI) that are located between the active layer, transparent conductive anode layer, indium tin oxide, and substrate are a major cause of light-extraction inefficiency in OLED devices. By incorporating any high-RI internal light-extraction layer that addresses this problem, the efficacy and lifetime of an OLED device can dramatically improve. This project will explore the application of a novel and unique three-dimensional gradient index (GRIN) layer for that purpose. In Phase I of the project, the grantee will demonstrate the performance and possible manufacturing method by using a laboratory-scale inkjet printer to prepare a functional three-dimensional GRIN layer for incorporation into an OLED test coupon by OLEDWorks.

PROJECT IMPACT

Using such a unique structure, OLEDs could be produced that achieve the theoretical maximum extraction efficiency. Furthermore, the envisioned OLED device with this layer will help to direct light where it’s most needed, while maintaining the desired “off-state” appearance when incorporated into a practical luminaire such as a panel.

CONTACTS

DOE Technology Manager: James Brodrick, James.Brodrick@ee.doe.gov
Lead Performer: Darryl Peters, Pixelligent Technologies LLC