Characterizing Nanomaterial Response for sub-100 ps X-ray Scintillation

Measuring sub 100 ps quantum dynamics of x-rays in the 1 -- 100 keV range is a need shared by many experimental programs and is beyond the capability of current techniques. We are investigating the feasibility of using colloidal quantum dots (CQDs) as a fast x-ray scintillator by functionalizing then experimentally characterizing the x-ray excitation and decay response of 13 varieties of CQDs. All variants will be evaluated for their stability, temporal decay characteristics. Functionalization will be using two fabrication methods; loading the nanomaterials into a polymer and drawing them into a microstructured photonic crystal fiber. Radiation response will be characterized at typical laboratory conditions (e.g, 23$^{\mathrm{o}}$C). Based on previous studies we expect that CdSe nanoplatelets and CsPbCl$_{\mathrm{3}}$ perovskite nanoplatelets will exhibit temporal resolutions under 100 ps. Photoluminescence decay will also be determined for the additional 11 nanomaterials when excited by a pulsed x-ray source.