Abstract
This paper presents the luminescence efficiency (LE) of toluene dissolved Cadmium Selenide/Zinc Sulfide (CdSe/ZnS) quantum dot (QD) samples after their irradiation with X-rays and UV. The LE was investigated as a function of the weight over volume (w/v) QD concentration under variable fluxes of X-rays and wavelengths of UV radiation. All the samples were handled through cubic 12.5 × 12.5 × 45 mm3 quartz cuvettes. For the X-ray experiments, the QD samples were irradiated by a ΒΜΙ General Medical Merate tube in the peak voltage range between 50 and 130 kVp. The tube was of rotating Tungsten anode type with inherent filtration equivalent to 2 mm Al. The w/v concentration varied between 7.1 × 10−5 mg/mL to 49.7 × 10−5 mg/mL. The UV induced LE was of symmetrical distribution versus UV wavelength, with maximum at the 590 nm. The X-ray induced LE, increased with w/v QD sample concentration, saturating however, in the w/v range between 21.3 × 10−5 mg/mL and 28.4 × 10−5 mg/mL. The maximum LE was observed for the 21.3 × 10−5 mg/mL QD sample after the irradiation of 90 kVp X-rays. The distinction of the LE values in the highly concentrated samples was vague. In the peak voltage range between 120 and 130 kVp, all QD concentration levels exhibited comparable X-ray induced LE values. The LE properties of the studied QD samples could be promising as X-ray radiation sensors.
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Nikolopoulos, D. et al. (2016). Luminescence Efficiency of Cadmium Selenide/Zinc Sulfide (CdSe/ZnS) Quantum Dot Nanoparticle Sensors Under X-Ray Excitation. In: Kervalishvili, P., Yannakopoulos, P. (eds) Nuclear Radiation Nanosensors and Nanosensory Systems. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-7468-0_5
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