Resonance Energy Transfer from Monolayer WS₂ to Organic Dye Molecules: Conversion of Faint Visible‐Red into Bright Near‐Infrared Luminescence

The synergetic combination of transition metal dichalcogenides (TMDCs) with organic dye molecules in functional heterostructures is promising for various optoelectronic applications. Here resonance energy transfer (RET) from a red-emitting WS2 monolayer (1L-WS2) to layer near-infrared (NIR) emitting demonstrated. It found that the total photoluminescence (PL) yield up factor eight higher as compared PL pristine 1L-WS2. This attributed efficient conversion mostly non-radiative excitons 1L-WS2 into radiative layer. A type-I level alignment 1L-WS2/dye interface assures emission bright PL. From excitation density-dependent experiments, it concluded RET prevails against defect-assisted recombination well Auger-type exciton-exciton annihilation work paves way employing TMDCs nanoscale light-emitting devices improved efficiency and tunable color.