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Several devices using a europium complex Eu͑TTA͒ 3 ͑DPPz͒(TTAϭ2-thenoyltrifluoroacetonate, DPPzϭdipyrido͓3,2-a:2Ј,3Ј-c͔phenazine) as dopant emitter were fabricated. The performances of these devices are among the best reported for devices incorporating a europium complex as a red emitter. One such device with structure TPD ͑50 nm͒/Eu:CBP ͑4.5%, 30 nm͒/BCP ͑30 nm͒/Alq ͑25 nm͒ exhibits an external quantum efficiency 2.1%, current efficiency 4.4 cd/A, power efficiency 2.1 lm/W, and brightness 1670 cd/m 2 .

Four new iridium biscarbene complexes with different N⁁N ligands showing very different emission colors from deep‐blue to red are synthesized. The emission colors are mainly controlled by the N⁁N ligands. The electroluminescent devices using these complexes as dopant emitters exhibit extremely high efficiencies.

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