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The optimal sample exhibits a high luminescence thermal stability, due to a large negative thermal quenching. The mechanism of the negative thermal quenching is suggested as the conversion of thermal energy into light energy.

Formation and enhancement of negative thermal quenching in emission of KGdF4:Eu3+, Yb3+@GQDs

Formation and enhancement of negative thermal quenching in emission of KGdF₄:Eu³⁺, Yb³⁺@GQDs