STUDIES ON SYNTHESIS AND EL PROPERTIES OF SEVERAL NOVEL SQUARAINES

Several novel squaraines were synthesized and their structures were el ucidated by LR, HNMR, MS and elementary analysis. Their photoluminesce nt (PL) and electroluminescent (EL) properties have been studied, whic h indicated that all of them had electron-transporting properties, and some had both electron-and hole-transporting properties. One of the s quaraines was inserted between a cathode and an anode, and the single- layer-sandwiched device processed a red-light-emitting ability under b oth low negative and low positive driven bias. It was regarded as one kind of promising material. (C) 1997 Elsevier Science S.A.