Novel, highly efficient blue-emitting heteroleptic iridium(III) complexes based on fluorinated 1,3,4

Novel, highly efficient blue-emitting heteroleptic iridium(III) complexes based on fluorinated 1,3,4

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Novel, highly efficient blue-emitting heteroleptic iridium( III ) complexes based on fluorinated 1,3,4-oxadiazole: tuning to blue by dithiolate ancillary ligands { Lianqing Chen, a Han You, b Chuluo Yang, * a Dongge Ma * b and Jingui Qin * a Received (in Cambridge, UK) 13th November 2006, Accepted 21st December 2006 First published as an Advance Article on the web 18th January 2007 DOI: 10.1039/b616493e Novel blue-emitting phosphorescent iridium(III) complexes with fluorinated 1,3,4-oxadiazole derivatives as cyclometalated ligands and dithiolates as ancillary ligands have been synthe- sized and fully characterized; highly efficient OLEDs have been achieved using these complexes in the light-blue to blue- emitting region. Phosphorescent heavy metal complexes play a very important role in organic light-emitting diodes (OLEDs) because their strong spin–orbit coupling, caused by the heavy metal atom, makes intersystem crossing between the singlet and triplet excited states more efficient. In theory, mixing the singlet and triplet excited states can lead to internal phosphorescence quantum efficiencies as high as 100%. 1 In particular, cyclometalated iridium(III) complexes show high phosphorescent efficiencies and relatively short life- times, and thus behave as one of the most promising class of phosphorescent dyes in OLEDs. Numerous highly efficient green- and red-emitting OLEDs have been reported using iridium c om p l e x e so rd e n d r im e r sa sp h o s p h o r e s c e n td y e s . 2
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Novel, highly efficient blue-emitting heteroleptic iridium(III) complexes based on fluorinated 1,3,4

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