Colloidal 2D WS2 nanosheets exhibiting high-purity single photon emission
The search for quantum emitters, delivering single photons "on demand" at cryogenic and elevated temperatures for photonic technologies is ever progressing. For example, micrometer-sized WS2 monolayers exhibit single photon emission by elaborated local defect or strain engineering. Here, we show that wet-chemically synthesised monolayered two-dimensional (2D) WS2 nano sheets (NSs) with lateral sizes of 14 (+/- 6 nm) readily emit single photons from exciton recombination without the need for substrate-induced patterning, strain/defect engineering or spectral filtering. Single particle spectroscopy of 70 individual NSs shows photoluminescence from excitons (2.02 eV), trios (1.94 eV) and defect-localized states (1.85 eV) with fast emission (t1<0.2 ns, t2=3.2 ns), allowing highly frequent excitation cycles. Pulsed at 80 MHz, colloidal WS2 NSs exhibit limited spectral diffusion, no blinking and distinct photon antibunching (g2(0)=0.07 at 5 K), thereby tackling challenges of established colloidal quantum dot systems (blinking, longer emission cycles), while retaining high single photon purity as key quality of deterministic quantum emitters.