Lighting accounts for 15% of annual global energy consumption. Due to mounting concerns arising from anthropogenic climate change, there is an increased demand for lighting technologies with higher efficiencies and greater longevity. My research will focus on synthesizing colloidal nanocrystals of Mn4+-doped A2MF6 (A = K, Na, Cs; M = Ti, Ge, Zr) lattices to be used as red-emitting phosphors. These activator-host materials can act as an efficient red component of white LEDs due to their narrow-band ~630 nm emission. Mn4+-doped fluorides have recently been utilized in next-generation lighting technologies, but the nanoscale regime that affords synthetic tunability and narrow emission bandwidth has yet to be well-established on the research or industrial scale. With a green chemistry emphasis, my proposed nanocrystal Schlenk-line synthesis will employ trifluoroacetic acid as the fluoride source instead of the commonly-used and highly toxic HF. The resultant nanomaterials will be characterized via a variety of techniques, including variable-temperature steady-state and time-resolved photoluminescence spectroscopies.
Advisor: Daniel Gamelin – Chemistry