Optical Characteristics of ZnCuInS/ZnS (Core/Shell) Nanocrystal Flexible Films Under X-Ray Excitation
George Saatsakis,
Nektarios Kalyvas,
Christos Michail,
Konstantinos Ninos,
Athanasios Bakas,
Christina Fountzoula,
Ioannis Sianoudis,
George E. Karpetas,
George Fountos,
Ioannis Kandarakis,
Ioannis Valais,
George Panayiotakis
Affiliations
George Saatsakis
Department of Medical Physics, Faculty of Medicine, University of Patras, GR-15310 Rion, Greece
Nektarios Kalyvas
Department of Biomedical Engineering, Radiation Physics, Materials Technology, and Biomedical Imaging Laboratory, University of West Attica, 122 10 Athens, Greece
Christos Michail
Department of Biomedical Engineering, Radiation Physics, Materials Technology, and Biomedical Imaging Laboratory, University of West Attica, 122 10 Athens, Greece
Konstantinos Ninos
Department of Biomedical Sciences, University of West Attica, 122 10 Athens, Greece
Athanasios Bakas
Department of Biomedical Sciences, University of West Attica, 122 10 Athens, Greece
Christina Fountzoula
Department of Biomedical Sciences, University of West Attica, 122 10 Athens, Greece
Ioannis Sianoudis
Department of Biomedical Sciences, University of West Attica, 122 10 Athens, Greece
George E. Karpetas
Department of Medical Physics, Faculty of Medicine, University of Thessaly, 41110 Larissa, Greece
George Fountos
Department of Biomedical Engineering, Radiation Physics, Materials Technology, and Biomedical Imaging Laboratory, University of West Attica, 122 10 Athens, Greece
Ioannis Kandarakis
Department of Biomedical Engineering, Radiation Physics, Materials Technology, and Biomedical Imaging Laboratory, University of West Attica, 122 10 Athens, Greece
Ioannis Valais
Department of Biomedical Engineering, Radiation Physics, Materials Technology, and Biomedical Imaging Laboratory, University of West Attica, 122 10 Athens, Greece
George Panayiotakis
Department of Medical Physics, Faculty of Medicine, University of Patras, GR-15310 Rion, Greece
The aim of this article is to evaluate optical characteristics, such as the intrinsic conversion efficiency and the inherent light propagation efficiency of three polymethyl methacrylate (PMMA)/methyl methacrylate (MMA) composite ZnCuInS/ZnS (core/shell) nanocrystal flexible films. The concentrations of these were 100 mg/mL, 150 mg/mL, and 250 mg/mL, respectively. Composite films were prepared by homogeneously diluting dry powder quantum dot (QD) samples in toluene and subsequently mixing these with a PMMA/MMA polymer solution. The absolute luminescence efficiency (AE) of the films was measured using X-ray excitation. A theoretical model describing the optical photon propagation in scintillator materials was used to calculate the fraction of the generated optical photons passed through the different material layers. Finally, the intrinsic conversion efficiency was calculated by considering the QD quantum yield and the optical photon emission spectrum.
