Synthesis and electron transporting properties of triblock copolymers consisting of polyfluorene and polystyrene

For the improvement of the electron transporting property of poly(9,9-di- n -octylfluorene) (PFO) as a conventional polymer light-emitting diode material, well-defined triblock copolymers of PFO [number-average molecular weight ( M n ) ≈ 10 000] with different chain length polystyrene (PSt) ( M n  ≈...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2022-06, Vol.61 (SE), p.SE1008
Main Authors: Cheng, Jin, Kanehashi, Shinji, Ogino, Kenji
Format: Article
Language:English
Subjects:
Annealing
Block copolymer
Block copolymers
Chemical reactions
Copolymers
Coupling (molecular)
Electron mobility
Electron transport
Glass transition temperature
Light emitting diodes
Molecular orbitals
Optical properties
polyfluorene
polystyrene
Polystyrene resins
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Summary:For the improvement of the electron transporting property of poly(9,9-di- n -octylfluorene) (PFO) as a conventional polymer light-emitting diode material, well-defined triblock copolymers of PFO [number-average molecular weight ( M n ) ≈ 10 000] with different chain length polystyrene (PSt) ( M n  ≈ 1000, 2000, and 3000) were synthesized via a combined synthesis strategy of Suzuki–Miyaura reaction, atom transfer radical polymerization, and Steglich coupling reaction. Electron-only devices for homopolymer and triblock copolymers were fabricated by a solution process. It was demonstrated that triblock copolymer ( M n,PSt ≈ 2000) after annealing exhibited the highest electron mobility. Thermal, optical, electrochemical and morphological properties were investigated severally and revealed that the microphase separated structure was formed in block copolymers ( M n,PSt ≈ 2000, and 3000) after annealing, and the introduction of PSt raised the glass transition temperature ( T g ) and deepened the lowest unoccupied molecular orbital level.
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/ac4c6b