HIGH MOBILITY HIGH EFFICIENCY ORGANIC FILMS BASED ON PURE ORGANIC MATERIALS

摘要

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 (904) is to purify the organic small molecule material by thermal gradient sublimation. The second step (908) is to test the purity of at least one sample from the purified organic small molecule material by spectroscopy. The third step (910) 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.