“…This has motivated many studies on exciton transfer as well as charge transfer involving the ground and excited state in TMDCbased heterostructures. [2,3,4,[5][6][7][8] In particular, excited state charge transfer between the organic component and the TMDCs [5,9,10] as well as non-radiative resonance energy transfer (RET) from organic dye molecules to TMDCs [3,6,11,12] have been utilized to enhance the photosensitivity and to tune the spectral range in nanoscale photodetecting devices. [3,5,8,13] The reverse transfer of excitation energy, namely that from TMDCs to dye molecules is of special interest for the development of nanoscale electrically pumped light sources benefitting from the high PL quantum yield (up to 100%) of organic dyes as well as the wide tunability of their emission wavelength.…”