 Sulfide-based luminescent materials have been widely studied for a variety of lighting applications such as flat screen displays, field emission displays, and powder electroluminescence for backlights. These materials can be doped with various elements such as cerium and europium to produce a range of colors across the visible spectrum. Additionally, sulfide materials have recently gained popularity due to their ability to emit a broadband red emission from europium-doped materials, which can be used as a color conversion material in white light-emitting diodes, LEDs. Rare earth-doped binary alkaline earth sulfides, such as calcium sulfide and strontium sulfide, thio-gullates, though illuminates, and thio-silicates have also been investigated as conversion phosphors for LEDs. Furthermore, size-dependent luminescence has been observed in both intrinsic colloidal quantum dots, such as lead sulfide and cadmium sulfide, and doped nanoparticles. This article was authored by Philippe F. Smet, Iwan Morales, Zeker Hens, and others. We are article.tv, links in the description below.