Manifestations of triplet electronic excitations migration in ?-electron containing polymers
The results of spectral studies of polymers with aromatic side groups are considered and analyzed. In particular, the phosphorescence spectra of polyvinylcarbazole (PVCa) polyvinyl-7-benzocarbazole (PV7BK) polypropylcarbazole (PEPC) are presented and analyzed. The phosphorescence of these polymers has been shown to be related to the migration of triplet excitons in macromolecules. The phosphorescence of PVC is determined at 77by deep traps (oxides), at 4.2 -shallow traps (monomer units of PVCa). The spreading length of triplet excitons in PVCa macromolecules is 600 A – that corresponds to the average distances between adjacent traps in the macromolecule. There are no such traps in PV7BK macromolecules. The boundary conditions for triplet excitons in macromolecules of PV7BCa were used for evaluation the excitons spreading length. With this aim the dependence of phosphorescence spectra on molecular weihgt were studied The effect of changing of spectral positions of phosphorescence bands when exciton rich the end macromolecular cell was used. The average trip length of triplet excitons is approximately 1000 A. This distance is in fact limited by the probability of the meeting of triplet excitons in the macromolecule and their annihilation at a given excitation intensity.
Key words: polymers, phosphorescence, triplet excitons, deep and shallow traps.
Pages of the article in the issue: 242-245
Language of the article: Ukrainian
YASHCHUK, V. (1998) Migrating Electronic Excitations in π-electron-containing Polymers. Molecular Crystals and Liquid Crystals. 324. p. 211-222.
LOSYTSKY, M. YU., KUZMENKO, L. V., SHCHERBAKOV, O. V., GAMALEIA, N. F., MARYNIN, A. I. & YASHCHUK, V. M. (2017) Energy Transfer in Ce0.85Tb0.15F3 Nanoparticles-CTAB Shell-Chlorin e6 System. Nanoscale Research Letters. 12. p. 294–299.
KOSACH, V.V., PIVOVARENKO, Y. V. & YASHCHUK, V. M. (2016) Diflavonols single emitters for polymer-basaesd WOLEDs Functional Materials. 23. p. 1–4.
YASHCHUK, V. M. (1999) Triplet excitons in π-electron containing polymers. Polimery. 44. p. 475–480.
KLUPFFER, W. & BAUSER, H. (1976) Zur Excimer fluoreszenz und phosphoreszenz in polyvinylcarbzol. Z. Phys. Chem, K.P. 101. p. 25–29.
BURKHART, R. D., JHON, N.-I. & BOILEAU, S. (1991) An investigation of binding energies
of triplet excimers in carbazolyl-containing polymers. Macromolecules. 24. p. 6310–6317.
YASHCHUK, V. M. (2004) Photonica polymeriv. Kyiv: «Kyyivs’kyi universytet».
FAIDYSH, A. N., SLOBODYANIK, V. V. & YASHCHUK, V. M. (1979) Intramolecular energy transfer by singlet and triplet excitons in macromolecules. J. Luminescence. 21. p. 85-92.
How to Cite
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).