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By doping red dye 4-dicyanomethylene-2-(tert-butyl)-6-methyl-4H-pyran(DCJTB) in the tris-(8-hydroxyquinolinato) metalMq3 (where M = Al, Ga, In) chelate complexes, a series of red-dopant organic light-emitting diodes with different doping concentra-tions have been fabricated. The electroluminescence efficiency of these red diodes with a DCJTB doped Mq3 emitting layer is found tobe decreased markedly with the increasing of doping concentration. Electroluminescence characteristics of these devices are studied interms of energy levels matching of red-dopant with the host materials and carrier transporting layers.