Efficient Ultrafast Scintillation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:msub><mml:mi>KLuS</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mo>:</mml:mo><mml:msup><mml:mi>Pr</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math> Phosphor: A Candidate for Fast-Timing Applications

A set of ${\mathrm{Pr}}^{3+}$-doped ${\mathrm{KLuS}}_{2}$ samples with different $\mathrm{Pr}$ concentrations are synthesized in the form transparent crystalline hexagonal platelets by chemical reaction under a flow hydrogen sulfide. Their structural, optical, and scintillation properties investigated thoroughly means x-ray powder diffraction, time-resolved luminescence spectroscopy, light yield, decay measurements to assess spectroscopic ${\mathrm{Pr}}^{3+}$ ions host. Charge-trapping processes further electron paramagnetic resonance. The fundamental absorption band edge host is located at 303 nm, due 4f \ensuremath{\rightarrow} 5d transition found 347 emission maximum given $4{f}^{1}5d1$ ${}^{3}{H}_{4}$ ion 380 leading photoluminescence time around 1 ns room temperature. moderate yield reaches 7200 ph/MeV. phenomenological model fitted measured temperature dependences spectra times better understand dynamics excited state center number photons emitted first nanosecond response evaluated be considerably higher (1.6--2.5 times) than that commercial $(\mathrm{Lu};\mathrm{Y}{)}_{2}({\mathrm{SiO}}_{4})\mathrm{O}$:$\mathrm{Ce},\mathrm{Ca}$ scintillator, which shows potential $\mathrm{Pr}$-doped for fast-timing scintillator applications.