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In recent years, much research has been undertaken to investigate thesuitability of two-dimensional materials to act as single-photon sources withhigh optical and quantum optical quality. Amongst them, transition-metaldichalcogenides, especially WSe$_{2}$, have been one of the subjects ofintensive studies. Yet, their single-photon purity and photonindistinguishability, remain the most significant challenges to compete withmature semiconducting systems such as self-assembled InGaAs quantum dots. Inthis work, we explore the emission properties of quantum emitters in aWSe$_{2}$ monolayer which are induced by metallic nanoparticles. Underquasi-resonant pulsed excitation, we verify clean single-photon emission with a$g^{(2)}(0) = 0.036\pm0.004$. Furthermore, we determine its temperaturedependent coherence time via Michelson interferometry, where a value of(13.5$\pm$1.0) ps is extracted for the zero-phonon line (ZPL) at 4 K, whichreduces to (9$\pm$2) ps at 8 K. Associated time-resolved photoluminescenceexperiments reveal a decrease of the decay time from (2.4$\pm$0.1) ns to(0.42$\pm$0.05) ns. This change in decay time is explained by a model whichconsiders a F\"orster-type resonant energy transfer process, which yields astrong temperature induced energy loss from the SPE to the nearby Agnanoparticle.

Temperature dependent temporal coherence of metallic-nanoparticle-induced single-photon emitters in a WSe$_{2}$ monolayer