Orange Electrophosphorescence of 2-(9, 9-Diethylfluoren-2-yl)-5- Trifluoromethylpyridine Iridium Complex

Wen Guan Zhang; Hui Pang; Sheng Min Zhao

doi:10.4028/www.scientific.net/AMR.785-786.624

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 785-786Orange Electrophosphorescence of 2-(9,...

Orange Electrophosphorescence of 2-(9, 9-Diethylfluoren-2-yl)-5- Trifluoromethylpyridine Iridium Complex

Abstract:

Emission spectrum of Iridium complex bis [2-(9, 9-diethylfluoren-2-yl)-5-trifluoromethyl-pyridinto-C³, iridium (acetylacetonate) (fl-5CF₃-py)₂Ir (acac) in THF was 589 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 (acac) (8 %) /LiF/Al and B ITO/PEDOT:PSS/PBD: PVK: (fl-5CF₃-py)₂Ir (acac) (8 %) /TPBi/LiF/Al were fabricated using iridium complex as emitter dopant with electro-luminescent spectra at 592 and 588 nm at the bias voltages of 9, 11 and 13V. Devices A and B exhibited luminance of 5265 (at 15 V) and 4098 cd/m² with Commission International de LEclairage (CIE) coordinates of (0.5805, 0.4185) and (0.5815, 0.4176), respectively. Device B (with TPBi) emitted orange light more efficiently than Device A (without TPBi).

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Periodical:

Advanced Materials Research (Volumes 785-786)

Pages:

624-627

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.785-786.624

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Online since:

September 2013

Authors:

Wen Guan Zhang, Hui Pang, Sheng Min Zhao

Keywords:

Electroluminescent Device, Fluorene, Iridium Complex, Orange, Trifluoromethylpyridine

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