7 a that the PL intensity increases up to 2.0 mol% doping and further has a decreasing trend.
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Tunable photoluminescence and energy transfer of Eu<sup>3+</sup>,Ho<sup>3+</sup>-doped Ca<sub>0.05</sub>Y<sub>1.93-x</sub>O<sub>2</sub> nanophosphors for warm white LEDs applications.
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