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An effective full-spectrum thermometer covering from the visible to NIR-II band was designed based on garnet Lu 2 CaMg 2 Ge 3 O 12 :Yb 3+ ,Er 3+ /Nd 3+ phosphors; meanwhile, Er 3+ ( 4 I 13/2 ) split into four Stark sublevels due to high crystal field strength.
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Zhao et al. (2024) studied this question.
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