Resonance Energy Transfer from Monolayer WS2 to Organic Dye Molecules: Conversion of Faint Visible-Red into Bright Near-Infrared Luminescence
Journal article
Publication Details
Author list: Zorn Morales N., Severin N., Rabe J.P., Kirstein S., List-Kratochvil E., Blumstengel S.
Journal: Advanced Optical Materials
Publication year: 2023
Publisher: John Wiley and Sons Inc
URL: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85165256914&origin=inward
Languages: English-Great Britain
Abstract
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 a layer of near-infrared (NIR) emitting organic dye molecules is demonstrated. It is found that the total photoluminescence (PL) yield of the heterostructures is up to a factor of eight higher as compared to the PL yield of pristine 1L-WS2. This is attributed to the efficient conversion of the mostly non-radiative excitons in 1L-WS2 into radiative excitons in the dye layer. A type-I energy level alignment of the 1L-WS2/dye interface assures the emission of bright PL. From excitation density-dependent PL experiments, it is concluded that RET prevails against defect-assisted non-radiative recombination as well as Auger-type exciton-exciton annihilation in 1L-WS2. The work paves the way for employing organic dye molecules in heterostructures with TMDCs in nanoscale light-emitting devices with improved efficiency and tunable color.
