MIDLAND, Mich., March 4 -- The Dow Chemical Co. and Osram Opto Semiconductors Inc. have signed a commercial supply agreement for Lumation light-emitting polymers (LEPs) for use in Osram's Pictiva polymeric light-emitting diode (pLED) display modules. Although specific terms of the agreement were not made public, the companies said the multiyear deal provides a flexible, self-adjusting pricing structure for the two companies. 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