“…The constant k q was also used to characterize the quenching mechanism. When k q is less than 2.0 × 10 10 M −1 s −1 , the quenching is preferentially dynamic, whereas static quenching is expected for higher k q values ( Cui et al, 2015 ). The k q values range from 0.75 to 2.80 × 10 12 M −1 s −1 , being higher than the limiting diffusional constant.…”