Excited state dynamics of PPI dendrimers functionalized with 4-(4′-ethoxybenzoyloxy)salicylaldehyde chromophores

Femtosecond Spectroscopy of Superfluorescent Fluorenyl Benzothiadiazoles with Large Two-Photon and Excited-State Absorption

“…The development of new organic molecules with efficient two-photon absorption (2PA) and specific linear photophysical and nonlinear optical properties remains a subject of great interest for a wide range of emerging applications, including two-photon fluorescence bioimaging, − optical power limiting, − microfabrication and optical data storage, − and singlet oxygen-based photodynamic therapy. − The nature of molecular electronic structure and fast inter- and intramolecular dynamic processes plays an important role in the formation of particular linear and nonlinear optical properties, such as transient excited-state absorption (ESA), − stimulated emission depletion (STED), − and superfluorescence and lasing abilities, − which are of great fundamental interest and need to be clearly determined. Fast dynamic processes of photochemical reactions, − formation of triplet–triplet ESA and triplet–triplet annihilation, , intramolecular hydrogen transfer, − relaxation rates and deactivation pathways of excited states in solvents of different polarities, ,− charge-transfer kinetics in metal–organic complexes and light-harvesting biological systems, , and solvation dynamics , have been investigated for a number of organic compounds using a well-defined transient absorption pump–probe method. , …”