Skip to Content
Find More Like This
Return to Search

High mobility high efficiency organic films based on pure organic materials

United States Patent

January 27, 2009
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A method of purifying small molecule organic material, performed as a series of operations beginning with a first sample of the organic small molecule material. The first step is to purify the organic small molecule material by thermal gradient sublimation. The second step is to test the purity of at least one sample from the purified organic small molecule material by spectroscopy. The third step is to repeat the first through third steps on the purified small molecule material if the spectroscopic testing reveals any peaks exceeding a threshold percentage of a magnitude of a characteristic peak of a target organic small molecule. The steps are performed at least twice. The threshold percentage is at most 10%. Preferably the threshold percentage is 5% and more preferably 2%. The threshold percentage may be selected based on the spectra of past samples that achieved target performance characteristics in finished devices.
Salzman; Rhonda F. (Ann Arbor, MI), Forrest; Stephen R. (Ann Arbor, MI)
The Trustees of Princeton University (Princeton, NJ)
11/ 529,367
September 29, 2006
UNITED STATES GOVERNMENT RIGHTS This invention was made with government support under Contract No. XAT-5-33636-03 awarded by U.S. Department of Energy, National Renewable Energy Laboratory. The government has certain rights in the invention.