Fig. 1: Scheme of thermal-dependence effects in phosphor. | Nature Communications

Fig. 1: Scheme of thermal-dependence effects in phosphor.

From: Thermally boosted upconversion and downshifting luminescence in Sc2(MoO4)3:Yb/Er with two-dimensional negative thermal expansion

Fig. 1: Scheme of thermal-dependence effects in phosphor.

a Positive thermal quenching phenomenon. b Zero thermal quenching phenomenon. c Negative thermal quenching (thermal enhanced) phenomenon. d Schematic illustration of the negative-thermal-index in Sc2(MoO4)3:Yb/Er, indicating that both the a-axis and c-axis contract while the b-axis expands at high temperature. Upon 980 nm laser excitation, simultaneously thermally enhanced upconversion and downshifting luminescence of Er3+ are achieved in Yb3+/Er3+ co-doped Sc2(MoO4)3 with a two-dimensional negative-thermal expansion.

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