Orange and Blue Electrophosphorescence of Iridium Complexes

Wen Guan Zhang; Lian Qin; Sheng Min Zhao

doi:10.4028/www.scientific.net/AMR.1033-1034.1158

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1033-1034Orange and Blue Electrophosphorescence of Iridium...

Orange and Blue Electrophosphorescence of Iridium Complexes

Abstract:

Two iridium complexes, orange emitter bis[2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethyl- pyridinto-C³, N] iridium (acetylacetonate) ((fl-5CF₃-py)₂Ir(acac)) and blue emitter bis(4,6-difluoro- phenylpyridine)(picolinate) iridium(III) (FIrPic), were used. As a single emitting layer at the constant emitting concentration of 8 wt %, EL spectra of the device containing the emitting layer PVK: PBD: (fl-5CF₃-py)₂Ir(acac) (8 wt %) peaked at 588 nm, the device having the emitting layer PVK: PBD: (fl-5CF₃-py)₂Ir(acac) (2 wt %): FIrPic (6 wt %) showed the main peak at 588 nm and the weak shoulder peaks at 472 and 500 nm, the device containing the emitting layer PVK: PBD: (fl-5CF₃-py)₂Ir(acac) (0.2 wt %): FIrPic (7.8 wt %) exhibited the main peak at 580 nm and slightly higher shoulder peaks at 472 and 500 nm. The device having the double emitting layers CBP: (fl-5CF₃-py)₂Ir(acac) (5 wt %) by spin-coating method and mCP: FIrPic (8 wt %) by vacuum deposition showed the main peaks at 472 and 500 nm, and shoulder peak at 580 nm. Maximum luminances of devices were found to be 14582 cd/m² (at 16 V), 12497 cd/m² (at 17 V), 1061 cd/m² (at 23 V), and 5396 cd/m² (at 25 V), respectively. The absence of host PVK, PBD, mCP or CBP emission in these devices indicated an efficient energy transfer from the host to the guest complex. Holes and electrons were efficiently recombined in the double emitting layers and an important approach for making WOLEDs was provided in the future.

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Periodical:

Advanced Materials Research (Volumes 1033-1034)

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1158-1162

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1033-1034.1158

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Online since:

October 2014

Authors:

Wen Guan Zhang*, Lian Qin, Sheng Min Zhao

Keywords:

Blue, Electroluminescent Device, Fluorene, Iridium Complex, Orange, Trifluoromethylpyridine

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