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Hu S, Liao Y, Zhang Y, Yan X, Zhao Z, Chen W, Zhang X, Liu H, Li H, Li L, Sun M, Sheng C. Effect of Thermal Annealing on Conformation of MEH-PPV Chains in Polymer Matrix: Coexistence of H- and J-Aggregates. Polymers (Basel) 2020; 12:polym12081771. [PMID: 32784767 PMCID: PMC7465953 DOI: 10.3390/polym12081771] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 07/31/2020] [Accepted: 08/05/2020] [Indexed: 11/16/2022] Open
Abstract
In diluted solid solution using poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) and polymethyl methacrylate (PMMA) or polystyrene (PS), both aggregated and extended conformations could be formed according to the weight ratio. Aggregated conformation in as-cast MEH-PPV/PMMA film presented a J-aggregate-like photoluminescence (PL) emission. After annealing at 160 °C, its PL showed characteristics of both J- and H-aggregates at the same time; however, extended conformation showed an oligomer-like emission, which was not sensitive to either measurement temperature or annealing temperature. Thus, the conformation transition between aggregated and extended is unlikely to happen in MEH-PPV/PMMA blends during thermal annealing. On the contrary, in MEH-PPV/PS blends, extended conformation dominated in as-cast film with oligomer-like emissions; after annealing at 160 °C, both J- and H- aggregate-like PL emissions were observed, indicating the conformation transitioned from extended to aggregated. Therefore, our work may suggest a new method to manipulate photophysical properties of conjugated polymers by combining appropriate host matrix and thermal annealing processes.
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Affiliation(s)
- Shu Hu
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; (S.H.); (Y.L.); (Y.Z.); (X.Y.); (H.L.); (L.L.)
| | - Yang Liao
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; (S.H.); (Y.L.); (Y.Z.); (X.Y.); (H.L.); (L.L.)
| | - Yang Zhang
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; (S.H.); (Y.L.); (Y.Z.); (X.Y.); (H.L.); (L.L.)
| | - Xiaoliang Yan
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; (S.H.); (Y.L.); (Y.Z.); (X.Y.); (H.L.); (L.L.)
| | - Zhenlu Zhao
- Beijing Spacecrafts, Beijing 100094, China; (Z.Z.); (W.C.); (X.Z.); (H.L.)
| | - Weiqiang Chen
- Beijing Spacecrafts, Beijing 100094, China; (Z.Z.); (W.C.); (X.Z.); (H.L.)
| | - Xin Zhang
- Beijing Spacecrafts, Beijing 100094, China; (Z.Z.); (W.C.); (X.Z.); (H.L.)
| | - Hongxing Liu
- Beijing Spacecrafts, Beijing 100094, China; (Z.Z.); (W.C.); (X.Z.); (H.L.)
| | - Heng Li
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; (S.H.); (Y.L.); (Y.Z.); (X.Y.); (H.L.); (L.L.)
| | - Li Li
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; (S.H.); (Y.L.); (Y.Z.); (X.Y.); (H.L.); (L.L.)
| | - Ming Sun
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; (S.H.); (Y.L.); (Y.Z.); (X.Y.); (H.L.); (L.L.)
- Correspondence: (M.S.); (C.S.)
| | - Chuanxiang Sheng
- School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China; (S.H.); (Y.L.); (Y.Z.); (X.Y.); (H.L.); (L.L.)
- Correspondence: (M.S.); (C.S.)
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Yoon S, Ji S, Yoo Y, Jeong JE, Kim J, Woo HY, Park B, Hwang I. Enhanced Polarization Ratio of Electrospun Nanofibers with Increased Intrachain Order by Postsolvent Treatments. J Phys Chem B 2016; 120:12981-12987. [DOI: 10.1021/acs.jpcb.6b08277] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Youngjun Yoo
- Department
of Chemistry, Inha University, Incheon 22212, Republic of Korea
| | - Ji-Eun Jeong
- Department
of Chemistry, Korea University, Seoul 02841, Republic of Korea
| | - Jeongho Kim
- Department
of Chemistry, Inha University, Incheon 22212, Republic of Korea
| | - Han Young Woo
- Department
of Chemistry, Korea University, Seoul 02841, Republic of Korea
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Yamada Y, Nakamura T, Yano K. In situ green synthesis of fluorescent monodispersed mesoporous silica spheres/poly(p-phenylenevinylene) composites. J Colloid Interface Sci 2016; 468:292-299. [DOI: 10.1016/j.jcis.2016.01.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 01/17/2016] [Accepted: 01/20/2016] [Indexed: 11/25/2022]
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Mulazzi E, Galli DE, Lefrant S, Wéry J, Massuyeau F, Faulques E. Dynamics of charge migration in poly(para-phenylene vinylene) films and nanocomposites with single walled carbon nanotubes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:045304. [PMID: 26744381 DOI: 10.1088/0953-8984/28/4/045304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present in this paper a comprehensive study of the migration dynamics of the charges underlying transient photoluminescence (PL) processes in poly(para-phenylene vinylene) (PPV) samples from room temperature to 13 K. In order to interpret experimental data, we have modelled the long-time PL decays (from 100 to 1000 ps) using a time function proportional to [Formula: see text] in which the parameter α is evaluated in a Monte Carlo simulation on polymeric chains. The one dimensional chains (2000 sites long) are formed by random sequences of long and short conjugated segments whose bimodal distributions have been elaborated in previous works in order to reproduce the PL band shapes and peak positions. Intra-chain and inter-chain dynamics are taken into account in the migration of the photogenerated charges from short to long conjugated segments. The statistical analysis is performed by averaging over a total of 10(6) trials for each initial conditions. The values of α have been determined for pristine PPV films and PPV composite films with single-walled carbon nanotubes. This theoretical analysis is in good agreement with experimental data and provides a coherent description for the migration of the photogenerated charges in such inhomogeneous polymeric systems.
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Affiliation(s)
- E Mulazzi
- Dipartimento di Fisica, Università degli Studi di Milano and European Theoretical Spectroscopy Facility (ETSF), via Celoria 16, 20133 Milano, Italy
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Wang H, Wang HY, Gao BR, Wang L, Yang ZY, Du XB, Chen QD, Song JF, Sun HB. Exciton diffusion and charge transfer dynamics in nano phase-separated P3HT/PCBM blend films. NANOSCALE 2011; 3:2280-2285. [PMID: 21491032 DOI: 10.1039/c0nr01002b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Exciton quenching dynamics has been systematically studied in pristine P3HT and nano phase separated P3HT/PCBM blend films under various excitation intensities by femtosecond fluorescence up-conversion technique. The behaviors of excitons in the films can be well described by a three-dimensional diffusion model. The small diffusion length and large charge transfer radius indicate that excitons reach the interface most likely by the delocalization of the excitons in P3HT fibrillar at a range of 4.8-9 nm so that the excitons can quickly delocalize in the P3HT domain to reach the interface (instead of by diffusion).
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Affiliation(s)
- Hai Wang
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, China
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Feist FA, Zickler MF, Basché T. Origin of the Red Sites and Energy Transfer Rates in Single MEH-PPV Chains at Low Temperature. Chemphyschem 2011; 12:1499-508. [DOI: 10.1002/cphc.201001010] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2010] [Indexed: 11/10/2022]
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High photoluminescence quantum yield due to intramolecular energy transfer in the Super Yellow conjugated copolymer. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.03.030] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kanemoto K, Yasui M, Kosumi D, Ogata A, Sugisaki M, Karasawa T, Akai I, Hashimoto H. Morphology-dependent carrier and exciton generations in regioregular poly(3-hexylthiophene) polymer diodes as revealed by bleaching spectroscopy. PHYSICAL REVIEW LETTERS 2009; 103:187402. [PMID: 19905831 DOI: 10.1103/physrevlett.103.187402] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Indexed: 05/28/2023]
Abstract
Bleaching probe spectroscopy performed for regioregular poly(3-hexylthiophene) diodes reveals that coexistent morphological phases determine the conducting and optical properties of conjugated polymer films. Photoinduced absorption measurements demonstrate that exciton migration occurs from lamella aggregates to morphological sites consisting of quasiuncoupled chains and that the latter sites determine steady-state photophysical properties. Spectroscopy synchronized with diode operation reveals that the morphological locations of injected carriers in polymer diodes vary with the applied bias.
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Affiliation(s)
- Katsuichi Kanemoto
- CREST/JST and Department of Physics, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.
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