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Ostapenko N, Gulbinas V, Augulis R, Boiko A, Chursanova M, Volkov A, Telbiz G. Fluorescence relaxation kinetics of poly(methylphenylsilane) film and nanocomposites. NANOSCALE RESEARCH LETTERS 2016; 11:185. [PMID: 27067733 PMCID: PMC4828352 DOI: 10.1186/s11671-016-1368-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 03/10/2016] [Indexed: 06/05/2023]
Abstract
A comparative study of fluorescence relaxation kinetics of σ-conjugated poly(methylphenylsilane) (PMPS) polymer film and nanocomposites has been performed by ultrafast time-gated fluorescence measurements at various temperatures. Investigations have revealed a fine structure of excitonic σ-σ* band. We attribute this structure to emission from two spatially independent states with different ordering of the polymer chain segments, type gauche and trans conformations. In contrary to a more ordered polymer poly(di-n-hexylsilane), no clear thermochromic transition has been detected in PMPS film; however, the trans band intensity increases with temperature and with excitation wavelength, but it is absent when polymer is incorporated into nanopores of small diameter.
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Affiliation(s)
- N Ostapenko
- Institute of Physics of NASU, pr. Nauki 46, Kiev, 03028, Ukraine
| | - V Gulbinas
- Center for Physical Sciences and Technology, Savanoriu 231, Vilnius, Lithuania
| | - R Augulis
- Center for Physical Sciences and Technology, Savanoriu 231, Vilnius, Lithuania
| | - A Boiko
- Institute of Physics of NASU, pr. Nauki 46, Kiev, 03028, Ukraine
- Center for Physical Sciences and Technology, Savanoriu 231, Vilnius, Lithuania
| | - M Chursanova
- National Technical University "Kyiv Polytechnic Institute", Pr. Peremohy 37, Kyiv, 03056, Ukraine.
| | - A Volkov
- National Technical University "Kyiv Polytechnic Institute", Pr. Peremohy 37, Kyiv, 03056, Ukraine
| | - G Telbiz
- Institute of Physical Chemistry NASU, Pr. Nauky 31, 03039, Kyiv, Ukraine
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Mobarok MH, McDonald R, Ferguson MJ, Cowie M. Mixed Bis(μ-silylene) and (μ-Silylene)/(μ-Germylene) Complexes Involving the Rh/Ir Metal Combination: Nature of the Si···Si Interactions in the Bis(μ-silylene) Species. Inorg Chem 2012; 51:9249-58. [DOI: 10.1021/ic300720y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Md Hosnay Mobarok
- Department
of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, Alberta, T6G 2G2 Canada
| | - Robert McDonald
- Department
of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, Alberta, T6G 2G2 Canada
| | - Michael J. Ferguson
- Department
of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, Alberta, T6G 2G2 Canada
| | - Martin Cowie
- Department
of Chemistry and ‡X-ray Crystallography Laboratory, University of Alberta, Edmonton, Alberta, T6G 2G2 Canada
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Ghislotti G, Nielsen B, Di Mauro LF, Sheey B, Mutti P, Pifferi A, Taroni P, Valentini L, Corni F, Tonini R. Annealing Studies of Visible Light Emission from Silicon Nanocrystals Produced by Implantation. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-452-105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractThe annealing behavior of silicon implanted SiO2 layers is studied using continuous and time-gated photoluminescence (PL). Two PL emission bands are observed. A band centered at 560 nm is present in as implanted samples and it is still observed after 1000 °C annealing. The emission time is fast (0.2 -2 ns). A second band centered at 780 nm further increases when hydrogen annealing was performed. The emission time is long (1 μs - 0.3 ms).
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Korotkova I, Sakhno T, Drobit‘ko I, Sakhno Y, Ostapenko N. Structure of poly(di-n-hexylsilane) in nanoporous materials. Chem Phys 2010. [DOI: 10.1016/j.chemphys.2010.06.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kazlauskas K, Dementjev A, Gulbinas V, Valkūnas L, Vitta P, Žukauskas A, Ostapenko N, Suto S. Temperature independent exciton relaxation in poly(di-n-hexylsilane) confined in nanoporous silica. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.09.065] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Schauer F, Kuřitka I, Sáha P, Nešpůrek S. Ultraviolet photoinduced weak bonds in aryl-substituted polysilanes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2007; 19:076101. [PMID: 22251584 DOI: 10.1088/0953-8984/19/7/076101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The susceptibility of aryl-substituted polysilylenes to photodegradation by ultraviolet (UV) radiation is examined on the prototypical materials poly[methyl(phenyl)silylene] (PMPSi) and poly[(biphenyl-4-yl)methylsilylene] (PBMSi). We extend the scope of our last paper (Schauer et al 2004 Polym. Degrad. Stabil. 84 383) with the elucidation of the degradation mechanisms for two different degradation wavelengths: 266 and 355 nm. The main purpose of this paper was to study photoluminescence (PL) after major degradation, predominantly in long-wavelength range 400-600 nm, studying the disorder, dangling bonds (DBs) and weak bonds (WBs) created by the degradation process. We claim that the PL of the 500-600 nm band is related to the existence of WBs on the Si chain and originates in the σ(*)-σ exciton migration at room temperature by diffusion, free electron-hole formation, trapping in WBs and subsequent radiative recombination by tunnelling. Increase of the normalized PL 520-540 nm band after UV degradation can be then evaluated as the increase of the density of states (DOS) of WBs. The efficiency of the WB creation in PMPSi is greater for 266 nm irradiation, supporting the notion of the suppressed exciton transport compared to the less energetical photon of 355 nm, where the WB creation is lowered due to the exciton migration to longer segments and/or already existing defects. For PBMSi the WB creation kinetics for 355 nm degradation is similar to that of PMPSi. The 266 nm degradation results then support the model calculations of DB and WB reconstruction in the more rigid Si skeleton.
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Affiliation(s)
- F Schauer
- Polymer Centre, Tomas Bata University in Zlin, Faculty of Technology, T G Masaryka 275, CZ 762 72 Zlin, Czech Republic
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Carlos LD, Sá Ferreira RA, Pereira RN, Assunção M, de Zea Bermudez V. White-Light Emission of Amine-Functionalized Organic/Inorganic Hybrids: Emitting Centers and Recombination Mechanisms. J Phys Chem B 2004. [DOI: 10.1021/jp049052r] [Citation(s) in RCA: 207] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- L. D. Carlos
- Departamento de Física, Universidade de Aveiro, 3810-193 Aveiro, Portugal, CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal, Institut for Fysik og Astronomi, Århus Universitet, Ny Munkegade, 8000 Århus C, Danmark, and Departamento de Química and CQ-VR, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, Apartado 202, 5001-911 Vila Real Codex, Portugal
| | - R. A. Sá Ferreira
- Departamento de Física, Universidade de Aveiro, 3810-193 Aveiro, Portugal, CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal, Institut for Fysik og Astronomi, Århus Universitet, Ny Munkegade, 8000 Århus C, Danmark, and Departamento de Química and CQ-VR, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, Apartado 202, 5001-911 Vila Real Codex, Portugal
| | - R. N. Pereira
- Departamento de Física, Universidade de Aveiro, 3810-193 Aveiro, Portugal, CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal, Institut for Fysik og Astronomi, Århus Universitet, Ny Munkegade, 8000 Århus C, Danmark, and Departamento de Química and CQ-VR, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, Apartado 202, 5001-911 Vila Real Codex, Portugal
| | - M. Assunção
- Departamento de Física, Universidade de Aveiro, 3810-193 Aveiro, Portugal, CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal, Institut for Fysik og Astronomi, Århus Universitet, Ny Munkegade, 8000 Århus C, Danmark, and Departamento de Química and CQ-VR, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, Apartado 202, 5001-911 Vila Real Codex, Portugal
| | - V. de Zea Bermudez
- Departamento de Física, Universidade de Aveiro, 3810-193 Aveiro, Portugal, CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal, Institut for Fysik og Astronomi, Århus Universitet, Ny Munkegade, 8000 Århus C, Danmark, and Departamento de Química and CQ-VR, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, Apartado 202, 5001-911 Vila Real Codex, Portugal
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