A decreasing trend in R/G values from 7 to 3.9 and 4.1 to 3 was observed in ZnAl 2 O 4 : Ho 3+ ,Yb 3+ and 0.25 mol % codoped ZnAl 2 O 4 : Ho 3+ ,Yb 3+ samples, respectively (inset of Figure 5 b,e).
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Utilizing Energy Transfer in Mn<sup>2+</sup>/Ho<sup>3+</sup>/Yb<sup>3+</sup> Tri-doped ZnAl<sub>2</sub>O<sub>4</sub> Nanophosphors for Tunable Luminescence and Highly Sensitive Visual Cryogenic Thermometry.
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