Thermally cross-linkable hole transporting polymer synthesized by living anionic polymerization for effective electron blocking and reduction of exciton quenching in multilayer polymer light emitting diodes

Kang, Beom‐Goo; Kang, Hongkyu; Kang, Nam‐Goo; Lee, Chang‐Lyoul; Lee, Kwanghee; Lee, Jae‐Suk

doi:10.1039/c2py20721d

Cited by 36 publications

(36 citation statements)

References 62 publications

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“…Crosslinked polymers are widely used in various devices due to their high mechanical strength [18][19][20] or solvent resistance during device fabrication. 21,22 Unlike typical research on crosslinked polymers, our group has used controlled crosslinking techniques for precisely ordering polymers. We reported molecular ordering in poly(2-vinylpyridine) (P2VP) through self-recognition and organization during the chemical reaction of P2VP and a crosslinker.…”

Section: Introductionmentioning

confidence: 99%

In situ formation of molecular-scale ordered polyaniline films by zinc coordination

et al. 2017

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Considerable research approaches have focused on improving the crystallinity of conducting polymers to enhance the electrical conductivity. However, it is difficult to control the arrangement of polymer chains without the use of expensive and complex methods because of the intrinsic morphology of polymers. Herein, we report a one-step in situ process to produce controlled molecular-scale ordered polyaniline (PANI) films by coordination crosslinking with Zn ions using solvent-vapor thermal annealing (SVTA). The resulting PANI film crosslinked by Zn coordination has a face-centered cubic structure at the molecular scale, which was confirmed by high-voltage electron microscopy. The in situ coordination crosslinking produced a new class of molecular ordering in the PANI films and drastically enhanced their conductivity, showing their potential for use in various electronic and energy devices.

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Section: Introductionmentioning

confidence: 99%

In situ formation of molecular-scale ordered polyaniline films by zinc coordination

et al. 2017

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“…In particular, this [4 + 2] cycloaddition reaction between a diene and a dienophile is a thermally reversible process, and therefore cross-linked polymeric products prepared via the DA reaction can be used for self-healing applications. [38][39][40][41][42][43] Thermally cross-linkable block copolymers, poly(4-ethynylstyrene)-b-poly(A)-b-poly(4-ethynylstyrene) and poly(A)-b-poly(4-ethynylstyrene), have been synthesized as an alternative hole-transporting layer to PEDOT: PSS in polymer light-emitting diodes and an active layer of the memory device. From the synthetic point of view, successful living anionic polymerization of functional monomers allows preparation of welldefined block copolymers with various functionalities.…”

Section: Introductionmentioning

confidence: 99%

Precise synthesis of thermoreversible block copolymers containing reactive furfuryl groups via living anionic polymerization: the countercation effect on block copolymerization behavior

et al. 2015

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The anionic block copolymerization of 4,4'-vinylphenyl-N,N-bis(4-tert-butylphenyl)benzenamine (A) with furfuryl isocyanate (B) was carried out using potassium naphthalenide (K-Naph) in tetrahydrofuran at −78 and −98°C to prepare well-defined block copolymers containing furan groups for the formation of thermoreversible networks via a Diels-Alder (DA) reaction. While no block copolymerization was observed in the absence of sodium tetraphenylborate (NaBPh 4 ) due to side reactions, well-defined poly-copolymers with controlled molecular weights (M n = 18 700-19 500 g mol −1 ) and narrow molecular weight distributions (M w /M n = 1.08-1.17) were successfully synthesized in the presence of excess NaBPh 4 . The occurrence of the undesirable side reactions during polymerization of B was effectively prevented by NaBPh 4 , which results in the change in the countercation from K + to Na + for further polymerization of B. The cross-linking via the DA reaction between the furan groups of PBAB and bismaleimide was proved by FT-IR and differential scanning calorimetry (DSC), and the thermoreversible properties of the cross-linked polymer were subsequently investigated using DSC and solubility testing. † Electronic supplementary information (ESI) available. See

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“…The memory devices fabricated with the resulting block copolymer showed high performances in terms of nonvolatile memory characteristics. 11 Accordingly, such successful synthesis of the well-defined functional block copolymers mentioned above allowed us to further try to synthesize various kinds of block copolymers containing A block, which might be used as appropriate materials for polymer-based electronic devices applications.…”

Section: ■ Introductionmentioning

confidence: 99%

Well-Defined Block Copolymers with Triphenylamine and Isocyanate Moieties Synthesized via Living Anionic Polymerization for Polymer-Based Resistive Memory Applications: Effect of Morphological Structures on Nonvolatile Memory Performances

et al. 2014

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The anionic block copolymerization of 4,4′-vinylphenyl-N,N-bis(4-tert-butylphenyl)benzenamine (A) with n-hexyl isocyanate (B) was performed using potassium naphthalenide (KNaph) in THF at −78 and −98°C in the presence of sodium tetraphenylborate (NaBPh 4 ) to afford the well-defined block copolymers for investigating the effect of morphological structures on electrical memory performances. The well-defined functional block copolymers (PBAB) with different block ratios had predictable molecular weights (M n = 17 700−79 100 g/mol) and narrow molecular weight distributions (M w /M n = 1.14−1.19). It was observed from transmission electron microscopy (TEM) that the block copolymers showed different morphological structures depending on block ratios. Although all memory devices fabricated from the resulting block copolymers with different block compositions equally exhibited nonvolatile resistive switching characteristics, which are governed by the trap-controlled space-charge-limited current (SCLC) conduction mechanism and filament formation, it was found that electrical memory performances of each device varied depending on morphological structures of the block copolymer films.

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Thermally cross-linkable hole transporting polymer synthesized by living anionic polymerization for effective electron blocking and reduction of exciton quenching in multilayer polymer light emitting diodes

Cited by 36 publications

References 62 publications

In situ formation of molecular-scale ordered polyaniline films by zinc coordination

In situ formation of molecular-scale ordered polyaniline films by zinc coordination

Precise synthesis of thermoreversible block copolymers containing reactive furfuryl groups via living anionic polymerization: the countercation effect on block copolymerization behavior

Well-Defined Block Copolymers with Triphenylamine and Isocyanate Moieties Synthesized via Living Anionic Polymerization for Polymer-Based Resistive Memory Applications: Effect of Morphological Structures on Nonvolatile Memory Performances

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