Zinc Oxide-Based Light Emitting Diodes (Phase II)

Investigating Organization
Materials Modification, Inc.

Principal Investigator(s)
Dr. Ramachandran Radhakrishnan, radha@matmod.com, (703) 560-1371 x 14

Subcontractor
General Atomics Display Systems, San Diego, CA

Funding Source
Small Business Innovation R&D, Phase II

Award
DOE Share: $750,000

Contract Period
8/1/05 - 7/1/07

Indium Tin oxide, currently used as the transparent conducting oxide electrode in OLED construction, is very expensive. It is desirable to lower the cost and resistivity of the electrode material and increase its optical transmissivity. In order to improve the cost and efficiency of OLEDs for solid-state lighting, this project is studying alternate transparent conducting oxide materials.  In the Phase I effort, selectively-doped conducting oxides were deposited on polished glass substrates. Transparent films with low resistivity (<20 ohms/sq) and optical transparency (>85%) were obtained. In the Phase II effort, these conducting oxides are being deposited on glass substrates for fabrication of green colored exit signs. The signs will be developed to meet ENERGY STAR requirements.

Content dated 2/08