Ultrafast Collective Excited-State Dynamics of a Virus-Supported Fluorophore Antenna.

ABSTRACT: Radiation brightening was recently observed in a multifluorophore-conjugated brome mosaic virus (BMV) particle at room temperature under pulsed excitation. On the basis of its nonlinear dependence on the number of chromophores, the origins of the phenomenon were attributed to a collective relaxation. However, the mechanism remains unknown. We present ultrafast transient absorption and fluorescence spectroscopic studies which shed new light on the collective nature of the relaxation dynamics in such radiation-brightened, multifluorophore particles. Our findings indicate that the emission dynamics is consistent with a superradiance mechanism. The ratio between the rates of competing radiative and nonradiative relaxation pathways depends on the number of chromophores per virus. The findings s

SUBMITTER: Holmes J 

PROVIDER: S-EPMC9306353 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature