Low-Cost One-Pot Synthesis of WS2 Quantum Dots with Wide Emission Spectrum for Light-Emitting Applications

Graphical S-TOP and go ! A low-cost, one-pot synthesis of WS 2 quantum dots was devised that relies on activated elemental sulfur (S-TOP, S dissolved in tri-n-octylphosphine) instead of an organic sulfur source. Light-emitting devices prepared from this material display a high color rendering index of 93 (see figure). We report a facile and low-cost synthesis of WS 2 quantum dots with bright broad-band emission, which are suitable for lighting applications. The thus fabricated WS 2 light-emitting diodes (LEDs) exhibit voltage independent electroluminescence spectra, and the optimized white LEDs generate a high color rendering index of 93.