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The results showed that the Tm3+ dopping causes a re-alignment in the energy levels of lanthanide ions. The Tm3+-codoped system enables the excited electrons to be accumulated in favor of excited-state population.

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The results showed that the Tm3+ dopping causes a re-alignment in the energy levels of lanthanide ions. The Tm3+-codoped system enables the excited electrons to be accumulated in favor of excited-state population.

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