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Organic europium complexes are of considerable interest due to their sharp narrow emission spectrum and potentially high emission quantum efficiency, originated from 2D0-7F2 electronic transitions of the central ions. This book reviews the achieved progresses in organic europium complexes and their applications in organic light-emitting diodes.

As we know, the accumulation-type space charge region is highly conductive, which is an important property for highly efficient charge generation in their application as charge injector and charge generation layer in OLEDs.