Novel Light Extraction Layers for Organic Light-emitting Diodes

Web Published:

Princeton Docket # 15-3085-1


Researchers at Princeton University, Department of Electrical Engineering, have developed a new structure and fabrication methods to make light extraction films for organic light-emitting diodes (OLEDs) or other thin film LED structures.


At present, a light extraction layer which consists of substrates and nanoparticles is employed to increase the efficiency of OLEDs. Nanoparticles have different refractive index from the surrounding substrate, and thus can scatter the light trapped in the substrate.

This innovation describes a new structure for light extraction layers, which creates higher refractive index contrast between substrate media and scattering centers without introducing new materials.



•       Light extraction films for OLEDs or other thin film LEDs

•       Optical diffuser

•       Backplane for LCD

•       Display applications

•       Interior lighting panels



•       Zero optical absorption

•       High refractive index contrast

•       High efficiency

•       Lower cost


The Faculty Inventor


Barry Rand, Assistant Professor of Electrical Engineering & Andlinger Center for Energy and the Environment

Professor Rand received his Ph.D. from Princeton University. His area of interest includes emerging device concepts and materials to help to realize the next generation of thin film electronic devices. His research focuses on the unique electronic and optical properties of thin film materials, and in particular semiconductors. Such as, the use of molecular and chalcogenide (e.g. oxide) semiconductors, as well as nanostructured quantized matter for emerging applications in solar cells, light emitting devices, and transistors. Studies that his group conducts range from those on fundamental optical and electrical characterization to device physics and engineering to processing. His work resides at the intersection of electrical engineering, materials science, physics, and chemistry. Professor Rand is the recipient of a DARPA Young Faculty Award, DuPont Young Professor Award, and 3M Nontenured Faculty Award.


Intellectual Property & Development status

Patent protection is pending.

Princeton is currently seeking commercial partners for the further development and commercialization of this opportunity.



Michael R. Tyerech

Princeton University Office of Technology Licensing • (609) 258-6762•

Xin (Shane) Peng

Princeton University Office of Technology Licensing • (609) 258-5579•


Patent Information:
For Information, Contact:
John Ritter
Princeton University
Barry Rand
Tae-Wook Koh