High Quantum Efficiency Scintillators for Dual Readout Calorimetry

We present the development of high quantum efficiency composite scintillators for dual readout calorimetry applications in high energy physics experiments. We focused on creating quantum dot (QD)-polymer composites that enhance both wavelength and timing separation between Cerenkov and scintillation light signals. During this study, customized quantum dots were synthesized and successfully integrated into polymethyl methacrylate (PMMA) matrices, achieving an unprecedented Stokes shift exceeding 250 nm. This large spectral separation allowed for effective isolation of Cerenkov light <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$(360-520 ~\text{nm})$</tex> from scintillation signals <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$(&gt;520 ~\text{nm})$</tex>. The composites demonstrated high QD loading (up to 25 % by weight) while maintaining optical transparency through surface modifications. Timing measurements confirmed clear temporal discrimination between prompt Cerenkov radiation and delayed scintillation events. Dual-channel detection using wavelength-optimized photomultiplier tubes successfully separated the signal components. These achievements address key challenges in current dual readout calorimeters, potentially enabling improved jet energy resolution and particle identification capabilities for future high energy physics experiments.