Highly efficient blue and white phosphorescent OLEDs based on an iridium complex

A new blue-emitting iridium complex, Iridium(III) bis [(2,3,4-trifluorophenyl) -pyridinato-N, C2'] picolinate (Ir(tfpd)2pic) has been designed, synthesized and used to fabricate blue phosphorescent organic light-emitting devices with a efficiency up to 41.4 lm/W (52.6 cd/A). Furthermore, by combining the blue phosphorescence of Ir(tfpd)2pic and the yellow emission of iridium(III) bis [2-(2-naphthyl)-pyridine] (acetylacetonate) (Ir(npy)2acac), highly efficient white emission with a maximum efficiency of 49.0 lm/W (54.5 cd/A) has been achieved. The results indicate that Ir(tfpd)2pic is a promising blue phosphor for the applications in highly efficient blue and white OLEDs.

Graphical abstractHighly efficient blue and white organic emitting devices have been achieved by using a new blue-emitting iridium complex Ir(tfpd)2pic as blue dopant.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Efficient blue OLEDs have been achieved by a new blue-emitting iridium complex. ► Efficienct white OLEDs have been achieved by a new blue-emitting iridium complex. ► Blue emission with a maximum efficiency up to 41.4 lm/W has been realized. ► White emission with a maximum efficiency of 49.0 lm/W has been achieved.