Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air
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Autori
Tomovic, A. Z.Jovanovic, V. P.
Durisic, I.
Cerovski, V. Z.
Nastasijević, Branislav J.
Veielovic, S. R.
Radulovic, K.
Žikić, Radomir
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
The photoluminescence (PL) quenching mechanism of UV light and air-exposed amorphous thin films of 4,4-bis(2,2-diphenylvinyl)-1,1-biphenyl (DPVBi), a well-known hole-transport material used in organic light-emitting diodes, is studied. Thin films of DPVBi are stable when exposed to UV light in vacuum but tend to degrade if oxygen is present simultaneously. This is evident from the changes in UV-vis absorption spectra of the latter, showing that degradation rate of DPVBi films is linearly proportional to both oxygen concentration and UV light intensity. Mass spectrometry study of such films revealed a number of different oxygen-containing molecules and fragments of DPVBi thus confirming apparent photo-oxidation process. Also, DFT study of molecular DPVBi with and without oxygen was carried out, the IR spectra calculated for the lowest energy molecules found and the results are compared with the experiment. The most sensitive to photo-oxidation is DPVBi photoluminescence, which decays ex...ponentially with respect to the concentration of photo-oxidized DPVBi molecules (impurities). The PL quantum yield of DPVBi thin film drops to a half of its original value for 0.2% of the impurities present, at which point an average distance between DPVBi molecules (the donors) and photo-oxidized DPVBi species (acceptors) is an order of magnitude larger than the separation between two adjacent molecules. This implies a need for a long-range Forster energy transfer, which we rule out based on the lack of a donor-acceptor spectral overlap. The apparent discrepancy can be removed by postulating exciton self-diffusion in DPVBi thin films, for which there is supporting evidence in existing literature. (C) 2015 Elsevier B.V. All rights reserved.
Ključne reči:
DPVBi molecule / Thin organic films / Photo-oxidation / Degradation / Photoluminescence quenching / Exciton self-diffusionIzvor:
Journal of Luminescence, 2015, 167, 204-210Finansiranje / projekti:
- Elektronske, transportne i optičke osobine nanofaznih materijala (RS-MESTD-Basic Research (BR or ON)-171033)
- Integralna studija identifikacije regionalnih genetskih faktora rizika i faktora rizika životne sredine za masovne nezarazne bolesti humane populacije u Srbiji - INGEMA_S (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-41028)
DOI: 10.1016/j.jlumin.2015.06.036
ISSN: 0022-2313; 1872-7883
WoS: 000361401600030
Scopus: 2-s2.0-84936865574
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Tomovic, A. Z. AU - Jovanovic, V. P. AU - Durisic, I. AU - Cerovski, V. Z. AU - Nastasijević, Branislav J. AU - Veielovic, S. R. AU - Radulovic, K. AU - Žikić, Radomir PY - 2015 UR - https://vinar.vin.bg.ac.rs/handle/123456789/738 AB - The photoluminescence (PL) quenching mechanism of UV light and air-exposed amorphous thin films of 4,4-bis(2,2-diphenylvinyl)-1,1-biphenyl (DPVBi), a well-known hole-transport material used in organic light-emitting diodes, is studied. Thin films of DPVBi are stable when exposed to UV light in vacuum but tend to degrade if oxygen is present simultaneously. This is evident from the changes in UV-vis absorption spectra of the latter, showing that degradation rate of DPVBi films is linearly proportional to both oxygen concentration and UV light intensity. Mass spectrometry study of such films revealed a number of different oxygen-containing molecules and fragments of DPVBi thus confirming apparent photo-oxidation process. Also, DFT study of molecular DPVBi with and without oxygen was carried out, the IR spectra calculated for the lowest energy molecules found and the results are compared with the experiment. The most sensitive to photo-oxidation is DPVBi photoluminescence, which decays exponentially with respect to the concentration of photo-oxidized DPVBi molecules (impurities). The PL quantum yield of DPVBi thin film drops to a half of its original value for 0.2% of the impurities present, at which point an average distance between DPVBi molecules (the donors) and photo-oxidized DPVBi species (acceptors) is an order of magnitude larger than the separation between two adjacent molecules. This implies a need for a long-range Forster energy transfer, which we rule out based on the lack of a donor-acceptor spectral overlap. The apparent discrepancy can be removed by postulating exciton self-diffusion in DPVBi thin films, for which there is supporting evidence in existing literature. (C) 2015 Elsevier B.V. All rights reserved. T2 - Journal of Luminescence T1 - Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air VL - 167 SP - 204 EP - 210 DO - 10.1016/j.jlumin.2015.06.036 ER -
@article{ author = "Tomovic, A. Z. and Jovanovic, V. P. and Durisic, I. and Cerovski, V. Z. and Nastasijević, Branislav J. and Veielovic, S. R. and Radulovic, K. and Žikić, Radomir", year = "2015", abstract = "The photoluminescence (PL) quenching mechanism of UV light and air-exposed amorphous thin films of 4,4-bis(2,2-diphenylvinyl)-1,1-biphenyl (DPVBi), a well-known hole-transport material used in organic light-emitting diodes, is studied. Thin films of DPVBi are stable when exposed to UV light in vacuum but tend to degrade if oxygen is present simultaneously. This is evident from the changes in UV-vis absorption spectra of the latter, showing that degradation rate of DPVBi films is linearly proportional to both oxygen concentration and UV light intensity. Mass spectrometry study of such films revealed a number of different oxygen-containing molecules and fragments of DPVBi thus confirming apparent photo-oxidation process. Also, DFT study of molecular DPVBi with and without oxygen was carried out, the IR spectra calculated for the lowest energy molecules found and the results are compared with the experiment. The most sensitive to photo-oxidation is DPVBi photoluminescence, which decays exponentially with respect to the concentration of photo-oxidized DPVBi molecules (impurities). The PL quantum yield of DPVBi thin film drops to a half of its original value for 0.2% of the impurities present, at which point an average distance between DPVBi molecules (the donors) and photo-oxidized DPVBi species (acceptors) is an order of magnitude larger than the separation between two adjacent molecules. This implies a need for a long-range Forster energy transfer, which we rule out based on the lack of a donor-acceptor spectral overlap. The apparent discrepancy can be removed by postulating exciton self-diffusion in DPVBi thin films, for which there is supporting evidence in existing literature. (C) 2015 Elsevier B.V. All rights reserved.", journal = "Journal of Luminescence", title = "Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air", volume = "167", pages = "204-210", doi = "10.1016/j.jlumin.2015.06.036" }
Tomovic, A. Z., Jovanovic, V. P., Durisic, I., Cerovski, V. Z., Nastasijević, B. J., Veielovic, S. R., Radulovic, K.,& Žikić, R.. (2015). Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air. in Journal of Luminescence, 167, 204-210. https://doi.org/10.1016/j.jlumin.2015.06.036
Tomovic AZ, Jovanovic VP, Durisic I, Cerovski VZ, Nastasijević BJ, Veielovic SR, Radulovic K, Žikić R. Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air. in Journal of Luminescence. 2015;167:204-210. doi:10.1016/j.jlumin.2015.06.036 .
Tomovic, A. Z., Jovanovic, V. P., Durisic, I., Cerovski, V. Z., Nastasijević, Branislav J., Veielovic, S. R., Radulovic, K., Žikić, Radomir, "Fast photoluminescence quenching in thin films of 4,4 -bis(2,2-diphenylvinyl)-1,1 -biphenyl exposed to air" in Journal of Luminescence, 167 (2015):204-210, https://doi.org/10.1016/j.jlumin.2015.06.036 . .