High-Temperature Photoluminescence in Colloidal Quasi 2D Materials

The recent development of quasi-two-dimensional (2D) semiconducting nanomaterials [nanoplatelets (NPLs)] prepared through solution-based chemistry has attracted significant attention in the field of color conversion materials. Herein, we demonstrate the efficient high-temperature photoluminescence of the as-prepared cadmium telluride NPLs from 300 to 500 K with visually observable emission at temperatures as high as 500 K Indeed, the thermal-emission quenching of the as prepared NPLs in solution was found to be not only reversible following thermal cycling up to 475 K, but also comparable to more chemically complex core/shell nanostructures. To the best of our knowledge, this is the first example of the as-synthesized colloidal nanoparticles capable of high-temperature photoluminescence. This discovery highlights previously unexplored emission properties of NPLs that have the potential to be utilized for the efficient design of high-quality light emitters.