Effect of the Concentration on the X-ray Luminescence Efficiency of a Cadmium Selenide/Zinc Sulfide (CdSe/ZnS) Quantum Dot Nanoparticle Solution

International Conference on Bio-Medical Instrumentation and related Engineering and Physical Sciences

物理学;医药卫生

Valais, I.^1 ; Michail, C.^1 ; Nikolopoulos, D.^2 ; Fountzoula, C.^3 ; Bakas, A.^4 ; Yannakopoulos, P.^2 ; Fountos, G.^1 ; Panayiotakis, G.^5 ; Kandarakis, I.^1

Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, Technological Educational Institute of Athens, Egaleo, Athens

122 10, Greece^1

Department of Computer Electronic Engineering, Piraeus University of Applied Sciences (Technological Education Institute of Piraeus), Petrou Ralli and Thivon 250, Aigaleo, Athens

GR122 44, Greece^2

Department of Medical Laboratories, Technological Educational Institute of Athens, Egaleo, Athens, Greece^3

Medical Radiological Technology, Faculty of Health and Caring Professions, Technological Educational Institute of Athens, Athens, Greece^4

Department of Medical Physics, School of Medicine, University of Patras, Rion

15310, Greece^5

关键词: CdSe/ZnS;    Concentration levels;    Luminescence efficiencies;    Luminescence properties;    Maximum Efficiency;    Quantum dot nanoparticles;    X ray irradiation;    X ray luminescence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/637/1/012031/pdf
DOI  :  10.1088/1742-6596/637/1/012031

学科分类：卫生学

来源: IOP

【 摘 要 】

In the current study preliminary results on the luminescence efficiency (LE) of toluene dissolved Cadmium Selenide/Zinc Sulfide (CdSe/ZnS, Sigma-Aldrich, Lumidot 694622) quantum dot samples (QDs) after exposure to X-rays of variable radiation flux are shown. The distinctive influence of the weight over volume (w/v) concentration of the samples in LE was investigated. The light emission of the QDs was additionally measured after UV irradiation. The distribution of the emitted light was symmetrical with a maximum at 590 nm. The w/v concentration of the QDs varied between 7.1×10-5mg/mL to 28.4×10-5mg/mL. The samples were handled in a cubic 12.5×12.5×45mm3quartz cuvette. Each sample was excited under X-ray irradiation, in the energy range from 50 to 130 kVp using a BMI General Medical Merate tube with rotating Tungsten anode and inherent filtration equivalent to 2 mm Al. The X-ray LE, induced by the 28.4×10-5mg/mL QDs found higher, however, the distinction was vague in the highly concentrated samples. The maximum efficiency was obtained at the 90 kVp for QDs with 21.3×10-5mg/mL w/v concentration. In the high energy range (120-130 kVp) all concentration levels exhibited comparable X-ray induced LE. The luminescence properties of the investigated QDs appear promising for X-ray detection applications.