Ramifications of codoping SrI2:Eu with isovalent and aliovalent impurities

Feng, Qingguo; Biswas, Koushik

doi:10.1063/1.4971180

Ramifications of codoping SrI₂:Eu with isovalent and aliovalent impurities

Journal Article · Tue Dec 06 00:00:00 EST 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4971180· OSTI ID:1497066

Feng, Qingguo ^[1]; Biswas, Koushik ^[1]

Arkansas State Univ. Jonesboro, AR (United States)

Eu²⁺ doped SrI₂ is an important scintillator having applications in the field of radiation detection. Codoping techniques are often useful to improve the electronic response of such insulators. Using first-principles based approach, we report on the properties of SrI₂:Eu and the influence of codoping with aliovalent (Na, Cs) and isovalent (Mg, Ca, Ba, and Sn) impurities. These codopants do not preferably bind with Eu and are expected to remain as isolated impurities in the SrI₂ host. As isolated defects they display amphoteric behavior having, in most cases, significant ionization energies of the donor and acceptor levels. Furthermore, the acceptor states of Na, Cs, and Mg can bind with I-vacancy forming charge compensated donor-acceptor pairs. Such pairs may also bind additional holes or electrons similar to the isolated defects. Lack of deep-to-shallow behavior upon codoping and its ramifications will be discussed.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1497066

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 21 Vol. 120; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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