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We compare the photoluminescence spectra of the low-temperature Mottinsulator \etcl (T_{MIT}=40 K) with spectra of metallic\kappa-(BEDT-TTF)_2Cu[N(CN)_2]Br, which is superconducting below T_c=11.8 K, inthe temperature range between 300 and 20 K. In the Mott insulating state of\kappa-(BEDT-TTF)_2Cu[N(CN)_2]Cl we observe a luminescence band at 1.95 eV dueto the recombination of an exciton created by a HOMO-LUMO optical excitation.This luminescence is quenched both in the high-temperature bad metal state of\kappa-(BEDT-TTF)_2Cu[N(CN)_2]Cl and in metallic\kappa-(BEDT-TTF)_2Cu[N(CN)_2]Br. The observation of the luminescence of anexciton provides evidence for the local character of excitations in the Mottinsulating state.

Localized states in the Mott insulator \kappa-(BEDT-TTF)_2Cu[N(CN)_2]Cl as probed by photoluminescence