Stable Electrophosphorescent Emission of Fluorenyltrifluoromethyl-Pyridine Iridium 2-Picolinic Acid at High Concentration

Wen Guan Zhang; Xiao Lan Shao; Xue Zhen Xie; Sheng Min Zhao

doi:10.4028/www.scientific.net/AMM.395-396.96

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 395-396Stable Electrophosphorescent Emission of...

Stable Electrophosphorescent Emission of Fluorenyltrifluoromethyl-Pyridine Iridium 2-Picolinic Acid at High Concentration

Abstract:

Emission spectrum of bis [2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethylpyridinto-C³, iridium (2-picolinic acid) (fl-5CF₃-py)₂Ir (pic) in THF was 572 nm. Two weak UV absorption bands can be assigned to spin-allowed singlet metal-to-ligand charge transfer (¹MLCT) and spin-forbidden ³MLCT transitions. The organic light-emitting devices A ITO/PEDOT: PSS/PBD: PVK: (fl-5CF₃- py)₂Ir (pic) (12 %) /LiF/Al, B ITO/PEDOT:PSS/PBD: PVK: (fl-5CF₃-py)₂Ir (pic) (2 %) /TPBi/LiF/Al and C ITO/PEDOT:PSS/PBD: PVK: (fl-5CF₃-py)₂Ir (pic) (12 %) /TPBi/LiF/Al were fabricated using iridium complex as emitter dopant with electroluminescent spectra at 576, 572 and 576 nm, respectively. Devices A, B and C exhibited maximum luminance of 983 cd/m² (at 10 V), 3132 cd/m² (18 V) and 9876 cd/m² (12V), respectively. Device C exhibited more efficient emission. The devices had excellent stability even at the high concentration.

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Applied Mechanics and Materials (Volumes 395-396)

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96-99

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https://doi.org/10.4028/www.scientific.net/AMM.395-396.96

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Online since:

September 2013

Authors:

Wen Guan Zhang, Xiao Lan Shao, Xue Zhen Xie, Sheng Min Zhao

Keywords:

Electroluminescent Device, Fluorene, Iridium Complex, Picolinic Acid, Trifluoromethylpyridine

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