When the Yb 3+ doping concentration continued to increase, the fluorescence intensity showed a decreasing trend due to cross-relaxation losses.
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Luminescence, energy transfer, colour modulation and up-conversion mechanisms of Yb<sup>3+</sup>, Tm<sup>3+</sup> and Ho<sup>3+</sup> co-doped Y<sub>6</sub>MoO<sub>12</sub>.
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