Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.042
Publication date: 16th December 2024
Title: Project MULANS: Multi-layered Nano Scintillators
Author(s), Abigail Seddon, Guillaume Bertrand, Ludovic Tortech
Affiliation, Commissariat à l’énergie atomique et aux énergies alternatives, Saclay, France
E-mail: abigail.seddon@cea.fr
Scintillators are materials that emit light when bombarded with high-energy particles (β, γ) or X-rays; they convert incoming X-ray radiation into visible light that can then be captured using film or photosensors. For each application wihtin radiodetection, there is an appropriate organic or inorganic scintillator exhibiting the requirements of the desired measurements. However, for all scintillators two phenomena are an ongoing challenge to master. (1) The scintillation light emission is isotropic, hindering efficient light collection. (2) Ultra-fast decay cannot be achieved without a drastic loss of light production. Herein, a multi-layered scintillation device is reported, exhibiting high light collection and ultra-fast decay (low afterglow) achievable via the Purcell effect. The Purcell effect is the enhancement of a quantum system's spontaneous emission rate by its environment.2 By using a substrate of either a layer of metal or alternating layers of metal and dielectric material, it was found that the light conversion efficiency can be increased by 250 percent for a scintillation device (Figure 1) compared to a conventional homogeneous scintillator.1
A proof-of-concept of a novel bilayer Purcell device is reported, consisting of an organic scintillation molecule, such as POPOP or 1,9-diphenylanthracene, with an inorganic dielectric such as CuBr. The devices are fully characterised strcuturally, including by SEM-EDX, XPS, and AFM. The difference in optical properties between each layer enables the angular enhancement observed by photophysics and radiphysics. Moving forwards, devices may provide better light yield and reduced decay times, inhibiting afterglow with adequate spectral shaping via the Purcell effect. Real-world results include enabling faster and better resolution scans. This is the first report of a device of this kind.
CEA and specifically the PTC program for funding.
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