Characteristics and fabrication of polymer light emitting diode using copolymer having perylene and triazine moieties in the polymer side chain

초록

We have synthesized a novel nonconjugated blue light-emitting copolymer containing perylene moieties as light-emitting units and triazine moieties as electron transporting, units in the polymer side chains. The copolymer was very soluble in most organic solvents, e.g., monochlorobenzene, tetrahydrofuran, chloroform, and benzene. A single-layered electroluminescence (EL) device having the configuration of ITO/non-conjugated blue light-emitting copolymer/Al exhibited its maximum external quantum efficiency and good carrier balance when the triazine content was 30 %. The device emitted blue light corresponding to the emission of the perylene moieties. The drive voltage decreased dramatically below 5 V, and the CIE coordinates were x=0.16, y=0.17. A device using the copolymer doped with a Ir(ppy)(3) as a phosphorescent dye showed an especially high quantum efficiency of 0.03.

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