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Dissimilar behavior of YAG:Ce and LuAG:Ce scintillator garnets regarding Li+ co-doping

Abstract

Using a combination of experimental methods, the substitution tendencies of Li+ and involved charge compensation mechanisms are determined and compared in two important similar scintillators, LuAG:Ce and YAG:Ce. The studies were performed on polycrystalline samples prepared by solid phase reactions as well as in single crystals grown by the vertical Bridgman method. The results show that Li+ in LuAG:Ce,Li is localized mainly at Lu3+ sites with charge compensation brought about by Ce3+→ Ce4+ conversion and creation of anion vacancies. Surprisingly, unlike LuAG:Ce,Li, no evidence for Li+ substitution at Y3+ sites and conversion of Ce3+ to Ce4+ has been obtained in YAG:Ce,Li. It suggests that Li+ goes mainly to interstitial positions and does not interact with Ce3+. From an application point of view, Li+ co-doping of YAG:Ce is not efficient to improve the scintillation decay parameters, however, it is efficient to reduce the amount of anion vacancies in both YAG and YAG:Ce

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Publication details

The article was received on 20 Dec 2017, accepted on 06 Feb 2018 and first published on 13 Feb 2018


Article type: Paper
DOI: 10.1039/C7CE02194A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Dissimilar behavior of YAG:Ce and LuAG:Ce scintillator garnets regarding Li+ co-doping

    M. Derdzyan, K. Hovhannisyan, A.V. Yeganyan, R. Sargsyan, A. Novikov, A. Petrosyan and C. Dujardin, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C7CE02194A

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