Low-temperature photoluminescence in self-assembled diphenylalanine microtubes
authors Nikitin, T; Kopyl, S; Shur, VY; Kopelevich, YV; Kholkin, AL
nationality International
journal PHYSICS LETTERS A
author keywords Diphenylalanine; Self-assembly; Photoluminescence; Exciton
keywords PEPTIDE NANOTUBES; NANOSTRUCTURES; NANOMATERIALS; NANOWIRES
abstract Bioinspired self-assembled structures are increasingly important for a variety of applications ranging from drug delivery to electronic and energy harvesting devices. An important class of these structures is diphenylalanine microtubes which are potentially important for optical applications including light emitting diodes and optical biomarkers. In this work we present the data on their photoluminescent properties at low temperatures (down to 12 K) and discuss the origin of the emission in the near ultraviolet (UV) range seen earlier in a number of reports. UV luminescence increases with decreasing temperature and exhibits several equidistant lines that are assigned to zero-phonon exciton emission line and its phonon replicas. We infer that the exciton is localized on the defect sites and significant luminescence decay is due to thermal quenching arising from the carrier excitation from these defects and non-radiative recombination. (C) 2016 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0375-9601
year published 2016
volume 380
issue 18-19
beginning page 1658
ending page 1662
digital object identifier (doi) 10.1016/j.physleta.2016.02.043
web of science category Physics, Multidisciplinary
subject category Physics
unique article identifier WOS:000373552000014
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