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
摘要:
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. (C) 2015 Elsevier Ltd. All rights reserved.
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
摘要:
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. (C) 2015 Elsevier Ltd. All rights reserved.
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 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. (C) 2015 Elsevier Ltd. All rights reserved.