Order of magnitude enhancement of monolayer MoS₂ photoluminescence due to near-field energy influx from nanocrystal films.

ABSTRACT: Two-dimensional transition metal dichalcogenides (TMDCs) like MoS₂ are promising candidates for various optoelectronic applications. The typical photoluminescence (PL) of monolayer MoS₂ is however known to suffer very low quantum yields. We demonstrate a 10-fold increase of MoS₂ excitonic PL enabled by nonradiative energy transfer (NRET) from adjacent nanocrystal quantum dot (NQD) films. The understanding of this effect is facilitated by our application of transient absorption (TA) spectroscopy to monitor the energy influx into the monolayer MoS₂ in the process of ET from photoexcited CdSe/ZnS nanocrystals. In contrast to PL spectroscopy, TA can detect even non-emissive excitons, and we register an order of magnitude enhancement of the MoS_2<

SUBMITTER: Guo T 

PROVIDER: S-EPMC5290460 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature