Substituent effect on photo- and electroluminescence properties of heteroleptic cyclometalated platinum(II) complexes based on a 2-(dibenzo[b,d]furan-4-yl)pyridine ligand

A series of heteroleptic cyclometalated platinum(II) complexes based on a 4- (Pt-1) and 5-substituted (Pt-2) cyclometalated ligand were prepared, and their photoluminescence (PL) and electroluminescence (EL) properties were investigated. In dichloromethane, the complexes bearing a fluoro (Pt-1a and...

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Bibliographic Details
Published in:Dyes and pigments 2016-01, Vol.124, p.165-173
Main Authors: Shigehiro, Tatsuya, Chen, Qiang, Yagi, Shigeyuki, Maeda, Takeshi, Nakazumi, Hiroyuki, Sakurai, Yoshiaki
Format: Article
Language:English
Subjects:
Electroluminescence
Excimer
Organic light-emitting diode
Phosphorescence
Photoluminescence
Platinum complex
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Summary:A series of heteroleptic cyclometalated platinum(II) complexes based on a 4- (Pt-1) and 5-substituted (Pt-2) cyclometalated ligand were prepared, and their photoluminescence (PL) and electroluminescence (EL) properties were investigated. In dichloromethane, the complexes bearing a fluoro (Pt-1a and Pt-2a) or a methyl (Pt-1b and Pt-2b) substituent exhibited green PL, whereas a trifluoromethyl substituent induced a red shift, affording yellow PL (Pt-1c and Pt-2c). For poly(methyl methacrylate) thin films doped with Pt-1a–c, higher PL quantum yields were obtained in comparison with the solution samples. Polymer light-emitting diodes (PLEDs) containing the platinum(II) complexes were fabricated, and the devices doped with Pt-1b and Pt-2b showed relatively high external quantum efficiencies. PLEDs doped with varying concentrations of Pt-1b were also fabricated, where generation of excimer-based EL led to significant shifts of the Commision Internationale de L'Eclairage chromaticity coordinate from (0.40, 0.56) (green) to (0.51, 0.48) (orange) with the device efficiency almost constant. [Display omitted] •The 2-(dibenzo[b,d]furan-4-yl)pyridine-based platinum(II) complexes were prepared.•The introduction of a trifluoromethyl group gave rise to a red-shifted emission.•The 4-substituted complexes showed improved PL quantum yields in the polymer films.•PLEDs with the 4- and 5-methyl-substituted complexes showed good device performance.•Efficient excimer EL was obtained from the 4-methyl-substituted complex.
ISSN:0143-7208
1873-3743
DOI:10.1016/j.dyepig.2015.09.015