Heavily Ce3+-doped Y3Al5O12 thin films deposited by a polymer sol–gel method for fast scintillation detectors
| Autor: | Alena Beitlerova, Romana Kucerkova, Dalibor Pánek, K. Rubešová, Ladislav Nádherný, V. Jakeš, Martin Nikl, Tomáš Parkman, František Hájek, Jakub Cajzl, Jan Havlíček |
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| Rok vydání: | 2019 |
| Předmět: |
Scintillation
Materials science Photoluminescence Analytical chemistry chemistry.chemical_element Cathodoluminescence 02 engineering and technology General Chemistry Yttrium Scintillator 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Cerium chemistry General Materials Science Thin film 0210 nano-technology Single crystal |
| Zdroj: | CrystEngComm |
| ISSN: | 1466-8033 |
| DOI: | 10.1039/c9ce00842j |
| Popis: | The performance of cerium-doped Y3Al5O12 (Ce3+:YAG) often depends on cerium solubility achievable in a particular preparation technology. This solubility is kinetically affected by the synthesis process which allows for Ce3+ solubility to be generally much higher in a polycrystalline material than in single crystals. This work presents Y3−xCexAl5O12 polycrystalline thin films deposited by spin-coating where cerium is substituted on yttrium sites in an interval of 3.3–25 at%. Up to a concentration of 18 at%, the samples remain single-phase, which is the highest Ce3+ doping level in YAG published so far. Absorption, excitation and emission photoluminescence spectra are presented. The photoluminescence decays of the samples containing up to 6 at% cerium are comparable in radiative lifetime to those of Ce3+:YAG single crystals having the cerium concentration limit over one order smaller. The cathodoluminescence of the samples and soft X-ray nanosecond pulse-excited decays are examined. The scintillation decays appear much faster with a 1/e decay time well below 10 ns compared to that of a Ce3+:YAG single crystal which is 140 ns. After further optimization of the microstructure and the overall scintillation yield, sol–gel prepared Ce3+:YAG thin films are promising candidates for application in fast SEM scintillation detectors, currently intensively investigated in the scintillator technology field. |
| Databáze: | OpenAIRE |
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