High-Recombination Efficiency White Phosphorescent Organic Light Emitting Devices (Phase I)

Investigating Organization
Universal Display Corporation

Principal Investigator(s)
Brian W. D'Andrade, bdandrade@universaldisplay.com, (609) 671-0980, x 292

Subcontractor
Princeton University under the direction of Prof. Stephen R. Forrest

Funding Source
Small Business Innovation R&D, Phase I

Award
DOE Share: $98,894

Contract Period
6/27/05 - 3/26/06

Universal Display Corporation (UDC), in collaboration with Professor Mark Thompson from the University of Southern California (USC) and Professor Stephen Forrest from Princeton University, propose to improve the efficiency of white phosphorescent OLEDs (PHOLEDä) using novel emissive region doping profiles that further enhance the light outcoupling efficiency and the carrier recombination efficiency of PHOLEDs by 30% over that of conventional uniformly doped PHOLEDs.

Varying and optimizing the doping profile within the emissive layer may improve the recombination efficiency in PHOLEDs, and hence increase the external quantum efficiency (EQE).  In addition, the novel structures, such as mesh layers, that we are investigating in this program, could also improve the outcoupling efficiency by aligning the molecular transition dipole moments parallel to the substrate, which would then further increase the EQE.

At the end of this Phase I, we hope to demonstrate a white PHOLED having >30 lm/W at 800 nits, with correlated color temperature between 2,800 K and 6,000K, and color rendering >75.

Content dated 2/08