Abstract
In this work, polymers of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-triphenylamine] with side chains containing: pyrene (C1), diphenyl (C2), naphthalene (C3), and isopropyl (C6) structures were synthesized via a Suzuki coupling reaction. The structures were verified using NMR and cyclic voltammetry measurements provide the HOMO and LUMO of the polymers. The polymer with pyrene (C1) and naphthalene (C3) produced photoluminescence in the green while the polymer with the side chain containing diphenyl (C2) and isopropyl (C6) produce dual emission peaks of blue-green photoluminescence (PL). In order to examine the electroluminescence properties of the polymers, the solutions were spin-coated onto patterned ITO anode, dried, and subsequently coated with an Al cathode layer to form pristine single layer polymer LEDs. The results are compared to a standard PFO sample. The electroluminescence spectra resemble the PL spectra for C1 and C3. The devices of C2, C3, and C6 exhibit voltage-dependent EL. An additional red emission peak was detected for C2 and C6, resulting in spectra with peaks at 435 nm, 490 nm, and 625 nm. The effects of the side chains on the spectral characteristics of the polymer are discussed.
Highlights
Conjugated polymers are attractive because of the combined advantage of flexibility and conductivity for electronics and various forthcoming applications [1,2,3,4,5,6]
The dopant can consist of metal complexes, the red emission
The dibromo monomers of M1, M2, M3, and M6 were synthesized via Buchwald–Hartwig
Summary
Conjugated polymers are attractive because of the combined advantage of flexibility and conductivity for electronics and various forthcoming applications [1,2,3,4,5,6]. It was first shown that multiple emission colors can be obtained using blending polymers with different emission and charge-transport characteristics [8]. Red-green-blue emission from a single polymer was[12], achieved from aemission star-shaped polymer [12], was achieved recently from a star-shaped polymer whererecently. The dopant can consist of metal complexes, the red emission. A TPA-based polymer exhibits good hole-transporting properties hole-transporting properties electronics [15].TPA. The effects of different side chains on the photophysical and electroluminescence spectral are compared and discussed. C3 exhibited rather different emission characteristics as characteristics are compared discussed. The difference can be observed when the polymers characteristics as compared to C2 and C6 when optically excited.
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