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Optical Characteristics of ZnCuInS/ZnS (Core/Shell) Nanocrystal Flexible Films Under X-Ray Excitation

1
Department of Medical Physics, Faculty of Medicine, University of Patras, GR-15310 Rion, Greece
2
Department of Biomedical Engineering, Radiation Physics, Materials Technology, and Biomedical Imaging Laboratory, University of West Attica, 122 10 Athens, Greece
3
Department of Biomedical Sciences, University of West Attica, 122 10 Athens, Greece
4
Department of Medical Physics, Faculty of Medicine, University of Thessaly, 41110 Larissa, Greece
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(7), 343; https://doi.org/10.3390/cryst9070343
Received: 6 June 2019 / Revised: 2 July 2019 / Accepted: 3 July 2019 / Published: 4 July 2019
(This article belongs to the Special Issue Single Crystals for Biomedical Applications)
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Abstract

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. View Full-Text
Keywords: quantum dots; nanocrystals; ZnCuInS/ZnS; PMMA; luminescence efficiency quantum dots; nanocrystals; ZnCuInS/ZnS; PMMA; luminescence efficiency
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Saatsakis, G.; Kalyvas, N.; Michail, C.; Ninos, K.; Bakas, A.; Fountzoula, C.; Sianoudis, I.; Karpetas, G.E.; Fountos, G.; Kandarakis, I.; Valais, I.; Panayiotakis, G. Optical Characteristics of ZnCuInS/ZnS (Core/Shell) Nanocrystal Flexible Films Under X-Ray Excitation. Crystals 2019, 9, 343.

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