Slow Energy Transfer in Self-Doped β-Conformation Film of Steric Polydiarylfluorenes toward Stable Dual Deep-Blue Amplified Spontaneous Emission
Stavrinou, Paul N.
Cheetham, Nathan J.
KAUST DepartmentPhysical Science and Engineering (PSE) Division
Material Science and Engineering Program
Office of the VP
Embargo End Date2022-10-18
Permanent link to this recordhttp://hdl.handle.net/10754/672948
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AbstractExciton behavior is crucial for improving the optoelectronic property of a light-emitting conjugated polymer. Herein, the photoexcitation dynamics of exciton migration and energy transfer in a self-doped β-conformation film of the polydiarylfluorenes (poly[4-(octyloxy)-9,9-diphenylfluoren-2,7-diyl]-co-[5-(octyloxy)-9,9- diphenylfluoren-2,7-diyl], PODPF) are demonstrated. Compared to the first generation of the β-conformation polyfluorene, poly(9,9-dioctylfluorene) (PFO), energy transfer occurs in PODPF β-conformation films in a time period of ≈150 ps, much longer than those of the PFO ones (<5 ps), associated with the effective intrachain energy transfer (few hundred picoseconds), rather than interchain Förster energy transfer (a few picoseconds). Similar to PFO, the PODPF β-conformation also displays well-resolved vibronic emission peaks at 20 K, attributed to the planar and rigid conformation. Interestingly, a residual 0-0 band emission of nonplanar conformation chain segments (435 nm, 2.85 eV) at 20 K also further confirms the exciton migration from the amorphous state to the β-conformation domain in PODPF films. Therefore, the stable dual amplified spontaneous emission (ASE) behavior of the PODPF self-doped films at 461 nm (2.69 eV) and 483 nm (2.57 eV), originates from the individual amorphous and β-conformation domains.
CitationXu, M., Sun, L., Wang, S., Lin, J., Yu, M., Wang, X., … Huang, W. (2021). Slow Energy Transfer in Self-Doped β-Conformation Film of Steric Polydiarylfluorenes toward Stable Dual Deep-Blue Amplified Spontaneous Emission. Advanced Optical Materials, 2100723. doi:10.1002/adom.202100723
SponsorsM.X. and L.S. contributed equally to this work. The work was supported by the National Natural Science Foundation of China (22075136, 61874053), National Key Research and Development Program of China (2020YFA0709900), Natural Science Funds of the Education Committee of Jiangsu Province (18KJA430009), Natural Science Foundation of Jiangsu Province (BK20200700), “High-Level Talents in Six Industries” of Jiangsu Province (XYDXX-019), Research Innovation in University of Jiangsu Province (KYCX21_0771), the open research fund from State Key Laboratory of Supramolecular Structure, Materials (sklssm202108) and Anhui Province Key Laboratory of Environment-friendly Polymer Materials and and Anhui Province Key Laboratory of Optoelectronic Materials Science and Technology. N.C. received support from an EPSRC Doctoral Training Studentship at the Centre for Plastic Electronics at Imperial College London.
JournalAdvanced Optical Materials