TY - JOUR
T1 - Microscopic Investigation of Degradation Processes in a Polyfluorene Blend by Near-Field Scanning Optical Microscopy
AU - Nabha-Barnea, Shiran
AU - Maman, Nitzan
AU - Visoly-Fisher, Iris
AU - Shikler, Rafi
N1 - Publisher Copyright:
© 2016 American Chemical Society.
PY - 2016/9/13
Y1 - 2016/9/13
N2 - We have studied the degradation of the photoluminescence (PL) of a phase-separated film of a polyfluorene blend, F8BT/PFO, on the submicron length scale using near-field scanning optical microscopy, visualizing the PL of blend compositions that do not exist macroscopically in equilibrium. In the initial scans, the topography and the PL were anticorrelated, as the emission was dominated by the PFO-rich phase. This behavior changed at longer illumination times, where the emission was dominated by the F8BT-rich phase; i.e., the topography and PL were correlated. Using macroscopic investigation of the mechanisms that govern the PL, we could explain the time dependence of the PL spatial distribution: while the degradation of F8BT was driven by photobleaching, both faster absorption degradation and photobleaching processes dominate the degradation of PFO. In addition, we found that energy transfer does not protect the PFO from degradation and does not improve its resistance to oxidation.
AB - We have studied the degradation of the photoluminescence (PL) of a phase-separated film of a polyfluorene blend, F8BT/PFO, on the submicron length scale using near-field scanning optical microscopy, visualizing the PL of blend compositions that do not exist macroscopically in equilibrium. In the initial scans, the topography and the PL were anticorrelated, as the emission was dominated by the PFO-rich phase. This behavior changed at longer illumination times, where the emission was dominated by the F8BT-rich phase; i.e., the topography and PL were correlated. Using macroscopic investigation of the mechanisms that govern the PL, we could explain the time dependence of the PL spatial distribution: while the degradation of F8BT was driven by photobleaching, both faster absorption degradation and photobleaching processes dominate the degradation of PFO. In addition, we found that energy transfer does not protect the PFO from degradation and does not improve its resistance to oxidation.
UR - http://www.scopus.com/inward/record.url?scp=84987624541&partnerID=8YFLogxK
U2 - 10.1021/acs.macromol.6b01543
DO - 10.1021/acs.macromol.6b01543
M3 - Article
AN - SCOPUS:84987624541
SN - 0024-9297
VL - 49
SP - 6439
EP - 6444
JO - Macromolecules
JF - Macromolecules
IS - 17
ER -