Novel Light Extraction Enhancements for White Phosphorescent OLEDs
(Phase II)

Investigating Organization
Universal Display Corporation

Principal Investigator(s)
Dr.  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 II

Award
DOE Share: $750,000

Contract Period
7/1/05 - 6/30/06

The goal of this project is to realize an innovative approach to low-cost solid-state white light sources by applying two novel outcoupling schemes to our high-efficiency phosphorescent OLEDs (PHOLED™) to achieve power efficiencies >60 lm/W.

The Phase I goals were exceeded by fabricating white PHOLEDs with microlenses having 24 lm/W at a luminance of 1,000 cd/m2. The efficiency improvement was obtained by increasing the outcoupling efficiency by 22%. The total forward emission for devices with and without the lens arrays were measured with an integrating sphere, such that all forward-emitted light was collected in the sphere. Currently, we have made green, red, and blue-striped white 6"H6" lighting panels having a maximum efficiency of 30 lm/W, and are continuing to develop PHOLEDs that emit 500-800 lumens for room lighting.

In Phase II, UDC and Princeton University will demonstrate high-power-efficiency white PHOLED lighting panels. The team will build on their successful Phase I program to demonstrate white PHOLEDs that have improved outcoupling efficiency through the attachment of microlens arrays, in addition to incorporating OLED luminaires that  increase the total PHOLED outcoupling efficiency by at least 50%.

Content dated 2/08