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DCM Dyes

　DCM dye consists of a pyranylidene malononitrile as an electron acceptor and a 4-aminostyryl group as an electron donor. Chemical modifications of the substituent on the pyran ring and amino group control the wavelengths of absorption and luminescence. The DCM dyes are useful for laser oscillation and a red dopant for an organic light-emitting diode device. This dye is a low band gap material with good efficiency and long lifetime.