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Inside Cover: Stimuli‐Responsive Dual‐Color Photon Upconversion: A Singlet‐to‐Triplet Absorption Sensitizer in a Soft Luminescent Cyclophane (Angew. Chem. Int. Ed. 11/2018)
Author(s) -
Mase Kazuma,
Sasaki Yoichi,
Sagara Yoshimitsu,
Tamaoki Nobuyuki,
Weder Christoph,
Yanai Nobuhiro,
Kimizuka Nobuo
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201801896
Subject(s) - photon upconversion , luminescence , singlet state , photochemistry , fluorescence , absorption (acoustics) , cyclophane , excitation , materials science , photon , optoelectronics , chemistry , optics , physics , atomic physics , excited state , crystal structure , crystallography , quantum mechanics , composite material
Reversible emission color switching of TTA‐UC (triplet–‐triplet annihilation‐based photon upconversion) has been achieved, as shown by N. Yanai, N. Kimizuka et al. in their Communication on page 2806 ff. An Os complex sensitizer displays large anti‐Stokes shift by direct singlet‐to‐triplet (S‐T) NIR excitation, and the combination with a luminescent cyclophane emitter allows thermally reversible upconversion color switching between the green‐emissive crystalline state and yellow‐emissive nematic state.