Locally induced Stark shifts of collective excitonic modes in polyradical aggregates

• Amandeep Sagwal,
• Rodrigo Cezar de Campos Ferreira,
• Petr Kahan,
• Maximilian Rödel,
• Jindřich Nejedlý,
• Jiří Doležal and
• Martin Švec

Beilstein J. Nanotechnol. 2026, 17, 1185–1193, doi:10.3762/bjnano.17.81

• , nanocavity coupling, and electrostatic charge inhomogeneities in the clusters. This sensitivity to the external parameters demonstrates an effective means of control over radical excitonic aggregates. Keywords: chromophore; dark states; exciton; Stark shift; TEPL; tip-enhanced photoluminescence

• tip-enhanced photoluminescence (TEPL) technique, which allows one to access the excitonic modes without the need for an external bias [35][36][37]. Notably, this approach remains currently underexploited. In this work, we investigate the effect of the electric field on the photon response of

• positioning in various clusters. We discuss the complex behavior of the bias-dependent TEPL spectra in the context of a simple model that allows us to estimate the Stark shifts of the individual chromophores, their mutual coulombic coupling, and the influence of the nanocavity. Results and Discussion First