Fabrication of Highly Luminescent and Thermally Stable Phosphors through In-Situ Formation of BaSO 4 on Sulfur Nanodots.

Producing high performance phosphors using abundant and non-toxic precursors yet straightforward methods are promising but still a challenging task. Herein, highly luminescent and thermally stable phosphors were fabricated through an in situ precipitation synthesis strategy. Sulfur nanodots (S-dots) act as the precursors for precipitation reactions and also provide the luminescent centers. Structural and optical characterization investigations suggest that S-dots are incorporated in the matrix of BaSO 4 , and BaSO 4 provides passivation effect for the surface ligands or traps of S-dots. This results in the promotion of photoluminescence quantum yield from 23 % to 58 %, and the BaSO 4 matrix also leads to the obvious promotion of thermal stability. These merits endow the construction of phosphor-based light-emitting diodes by utilizing the S-dots@BaSO 4 hybrid phosphors as a color conversion layer. These research results are significant for developing sulfur-based luminescent materials, and also provide a solid and universal theory to produce high quality phosphors.