Non‐linear fluorescence quenching in molecular crystals I. Recombination of localized excitons

Abstract

From the measurements of quantum yield and fluorescence decay time of anthracene and naphthalene crystals for different pumping levels a t 300 K the rate constants of bimolecular

Intriguing Fluorescence Behavior of Diiminic Schiff Bases in the Presence ofin situProduced Noble Metal Nanoparticles

“…The mechanism of self-quenching is very diverse and is altered with the alteration of the system. Cross relaxation between fluorophore pairs, , exciton migration to trap sites, exciton–exciton recombination, and dimer and excimer formation − have been stated as the probable reasons.…”

“…The mechanism of self-quenching is very diverse and is altered with the alteration of the system. Cross relaxation between fluorophore pairs, 16,17 exciton migration to trap sites, 18 excitonÀexciton recombination, 19 and dimer and excimer formation 20À23 have been stated as the probable reasons. There is a report of electrochemical synthesis of gold nanoparticles (AuNPs) using poly[M(salen)] (M = Ni, Pd) by Tchepournaya et al 24 No report is available for synthesizing silver nanoparticles (AgNPs) with the help of salen or salen derivatives.…”

Fluorescence quenching: A tool for single-molecule protein-folding study

“…The underlying mechanisms for self-quenching can be very diverse and systemdependent. Mechanisms such as cross relaxation between fluorescent-particle pairs (23,24) exciton migration to trap-sites (25), exciton-exciton recombination (26), dimer formation (27,28), and excimer formation (29,30) have been suggested. In our experiment, the excitation intensity was about 10 W͞cm 2 .…”

Fluorescence of molecular crystals at high levels of optical pumping

“…Calculation by the model of isotropic three-dimensional diffusion [58] leads to the following result: …”