| Abstract [eng] |
Materials that can convert high-energy radiation, such as gamma or X-rays, into visible light are called scintillators and are used in computed tomography devices. In order to obtain high-quality and high-resolution images, scintillators must exhibit nanosecond decay times, high quantum efficiency values, and high emission intensities. Cerium or praseodymium doped yttrium, lutetium, or gadolinium aluminum garnets exhibit luminescent properties required for scintillators. One way to further improve the desired properties of compounds is by changing the elemental composition. In this work, cerium or praseodymium, boron, magnesium and scandium ion doped yttrium, lutetium, or gadolinium aluminum garnets were synthesized. Most attention was paid to samples in powder form, but coatings and ceramics have also been synthesized for practical applications. The obtained results revealed that the addition of boron to the structure of garnet has an important influence on the morphological and luminescent properties. As the boron content increases, the particle size increases. The intensities of the radioluminescence and photoluminescence emission spectra increase, the quantum efficiency values also increase, and the decay times become shorter. The results obtained in this thesis confirmed that boron can be successfully used in the garnet structure to further improve the already high-quality scintillators. |
