Optical Detection of Mn Impurity in Oxides: A Case Study of Sr(NO₃)₂and SrCO₃

초록

A minute amount of Mn-ion impurity is known to be able to alter the electric property of functional oxide materials significantly. Recently, we found that low-temperature photoluminescence spectroscopy was quite useful for detecting the Mn-ion impurity. As a case study, we examined the existence of Mn impurity in the widely-used commerial raw materials Sr(NO₃)₂and SrCO₃. In addition to a broad near-band-edge emission with a strong temperature dependence, both samples showed a sharp emission near 690 nm, which corresponded to the Mn-related red emission. From a quantitative analysis, we estimated the amounts of the Mn impurty in the two samples to be below 0.001%. This case study suggests that low-temperature photoluminescence measurements may be utilized to identify Mn impurities in various oxides.

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