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All‐Optical Temperature Sensing in Organogel Matrices via Annihilation Upconversion
Author(s) -
Nazarova Nadzeya,
Avlasevich Yuri,
Landfester Katharina,
Baluschev Stanislav
Publication year - 2019
Publication title -
chemphotochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.13
H-Index - 18
ISSN - 2367-0932
DOI - 10.1002/cptc.201900093
Subject(s) - photon upconversion , annihilation , wax , materials science , photon , excitation , sensitivity (control systems) , optoelectronics , chemical physics , luminescence , chemistry , optics , physics , quantum mechanics , composite material , engineering , electronic engineering
Modified organogels are bicontinuous colloidal systems which form a three‐dimensional network embedding well‐solvated organic dyes sensitive to minor changes in its microenvironment. It was demonstrated that these natural wax/oils based organogels can be applied for minimally invasive temperature sensing in life‐science objects. The desired temperature sensitivity of better than 100 mK, centered around the physiologically relevant temperature of 36 °C, is warranted by using the process of triplet‐triplet annihilation photon energy upconversion (TTA‐UC) as a sensing mechanism. This all‐optical sensing technique, based on ratiometric‐type signal registration, ensures significant independence of the data obtained on excitation intensity instabilities, local molecular concentration fluctuations and field‐of‐view variations. The TTA‐UC system is effectively protected for more than 1000 s against oxygen‐induced damage, allowing stable performance of this temperature‐sensing system even in ambient environments without lost of sensitivity and applying the same calibration curve.