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Article

Microwave-Assisted Synthesis of an Alternant Poly(fluorene–oxadiazole). Synthesis, Properties, and White Light-Emitting Devices

1
”Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, 700487 Iasi, Romania
2
Faculty of Electrical Engineering and Computer Science, Stefan cel Mare University, 720299 Suceava, Romania
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(10), 1562; https://doi.org/10.3390/polym11101562
Received: 23 August 2019 / Revised: 22 September 2019 / Accepted: 23 September 2019 / Published: 25 September 2019
An alternant poly(dihexyl fluorene-co diphenyl oxadiazole) has been synthetized by microwave-assisted oxidative polymerization. The structure has been confirmed by 1H-NMR and FTIR spectroscopies. Gel permeation chromatography indicated high molecular weight and low polydispersity index. DFT calculations suggested a complete separation of HOMO and LUMO orbitals, which were located on fluorene and oxadiazole moiety, respectively. X-ray diffraction, polarized light microscopy, and atomic force microscopy indicated the polymer tendency to stack into a layered morphology with a more compact structure for the films prepared by spin coating. Furthermore, UV-vis and photoluminescence spectroscopies indicated the formation of H-aggregates which played a key role in photoluminescence quenching in solid state. Nevertheless, the good charge mobility gained due to the orbital overlapping in H-aggregates led to excellent electroluminescence, which enabled the development of white OLED devices with outstanding stability. View Full-Text
Keywords: microwave; conjugated polymers; white organic light emitting diode; H-aggregates microwave; conjugated polymers; white organic light emitting diode; H-aggregates
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MDPI and ACS Style

Popovici, D.; Diaconu, A.; Rotaru, A.; Marin, L. Microwave-Assisted Synthesis of an Alternant Poly(fluorene–oxadiazole). Synthesis, Properties, and White Light-Emitting Devices. Polymers 2019, 11, 1562. https://doi.org/10.3390/polym11101562

AMA Style

Popovici D, Diaconu A, Rotaru A, Marin L. Microwave-Assisted Synthesis of an Alternant Poly(fluorene–oxadiazole). Synthesis, Properties, and White Light-Emitting Devices. Polymers. 2019; 11(10):1562. https://doi.org/10.3390/polym11101562

Chicago/Turabian Style

Popovici, Dumitru, Andrei Diaconu, Aurelian Rotaru, and Luminita Marin. 2019. "Microwave-Assisted Synthesis of an Alternant Poly(fluorene–oxadiazole). Synthesis, Properties, and White Light-Emitting Devices" Polymers 11, no. 10: 1562. https://doi.org/10.3390/polym11101562

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