TY - JOUR
T1 - Single-molecule linewidths of terrylene in incommensurate biphenyl: Thermocycling and time-resolved experiments
AU - Palm, V.
AU - Pars, M.
AU - Kikas, J.
AU - Nilsson, Mattias
AU - Kröll, Stefan
PY - 2007
Y1 - 2007
N2 - The purely electronic linewidth delta of terrylene impurity molecules in monocrystalline biphenyl is studied at temperatures T between 1.7 and 3.5 K using the technique of single-molecule spectroscopy (SMS). Based on the data obtained, individual molecules appear to have their own law of delta(T) dependence; further, hysteresis effects have been observed in thermocycling experiments. The single-molecule (SM) lines investigated quickly broaden and vanish at temperatures between 3 and 3.5 K and reappear after the sample is cooled down again. At T approximate to 2 K, a slow process of spectral diffusion (SD) was observed on timescales longer than 10s. To learn about the role of faster SD processes, the technique of intensity time-frequency correlation (ITFC) SMS was applied to a stable SM line after it had been broadened by 75% as a result of a thermocycling experiment. At 2 and 2.3 K, no significant line broadening could be revealed on timescales between 0.16 ms and 10s. (C) 2007 Elsevier B.V. All rights reserved.
AB - The purely electronic linewidth delta of terrylene impurity molecules in monocrystalline biphenyl is studied at temperatures T between 1.7 and 3.5 K using the technique of single-molecule spectroscopy (SMS). Based on the data obtained, individual molecules appear to have their own law of delta(T) dependence; further, hysteresis effects have been observed in thermocycling experiments. The single-molecule (SM) lines investigated quickly broaden and vanish at temperatures between 3 and 3.5 K and reappear after the sample is cooled down again. At T approximate to 2 K, a slow process of spectral diffusion (SD) was observed on timescales longer than 10s. To learn about the role of faster SD processes, the technique of intensity time-frequency correlation (ITFC) SMS was applied to a stable SM line after it had been broadened by 75% as a result of a thermocycling experiment. At 2 and 2.3 K, no significant line broadening could be revealed on timescales between 0.16 ms and 10s. (C) 2007 Elsevier B.V. All rights reserved.
KW - hysteresis
KW - linewidth temperature
KW - dependence
KW - time-resolved single-molecule spectroscopy
KW - terrylene
KW - incommensurate biphenyl
U2 - 10.1016/j.jlumin.2007.02.027
DO - 10.1016/j.jlumin.2007.02.027
M3 - Article
SN - 0022-2313
VL - 127
SP - 218
EP - 223
JO - Journal of Luminescence
JF - Journal of Luminescence
IS - 1
ER -