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Phase Separation of Excimer‐Forming Fluorescent Dyes and Amorphous Polymers: A Versatile Mechanism for Sensor Applications
Author(s) -
Crenshaw B. R.,
Weder C.
Publication year - 2005
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200401688
Subject(s) - materials science , amorphous solid , excimer , photoluminescence , annealing (glass) , polymer , fluorescence , glass transition , molecule , trapping , chemical engineering , photochemistry , chemical physics , nanotechnology , optoelectronics , composite material , optics , crystallography , organic chemistry , chemistry , physics , engineering , ecology , biology
A temperature‐sensing scheme that relies on kinetically trapping molecular mixtures of a sensor molecule and amorphous host materials in a thermodynamically unstable state is introduced. Subjecting the blends to temperatures above their glass transition leads to irreversible changes of their photoluminescence emission spectra due to phase separation and excimer formation, as shown in the Figure for blend films before (left) and after annealing at 150 °C for 42 h (right).