Abstract
Within the past decade, organo transition metal compounds consisting of triplet emitters have become highly attractive, in particular, due to their applicability in electro luminescent devices such as organic light emitting diodes (OLEDs). With this new technology, effi cient light emitting systems are evolving. For example, in the future it will become possible to fabricate large and brilliant fl at panel displays at a moderate price, to prepare illuminating wallpapers, and micro displays for all types of application. One important requirement for all of these applications is low power consumption and high effi ciency of the light emitting devices. Here, the organo transition metal compounds offer a great advantage. The maximum obtainable effi ciency may be a factor of four higher than for purely organic emitter materials. Thus, many research groups, both from academic and industrial laboratories, have become interested in this challenging scientifi c and application driven fi eld [1 – 40] . Organo transition metal compounds, such as the famous Ir(ppy) 3 or [Ru(bpy) 3 ] 2+
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