Modulation of photoluminescence properties of transition metal dichalcogenides through temperature and Au/Ag nanoparticles

Abstract Transition metal dichalcogenides (TMDCs) attract significant attention because of their remarkable optical properties. Nowadays, the light emission efficiency of TMDCs is still inferior. Temperature and plasma resonance effects can be important approaches in the modulation of their luminescence performance. Here, multilayer WSe 2 and monolayer MoSe 2 were synthesized. Under the temperature control system, two photoluminescence (PL) peaks are observed from multilayer WSe 2 . The higher-energy PL peak results from K-Γ indirect band gap transition, which is then demonstrated by the first principle calculation. Otherwise, PL enhancement is realized on monolayer MoSe 2 decorated with Au nanoparticles. The PL of WS 2 is inhibited by hybridization with Ag nanoparticles.