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The color-tunable upconversion (UC) emission and optical temperature sensing behavior was observed from the Er-Yb codoped Gd2TiO5 (GTO) phosphors synthesized by the simple sol-gel method. By control of the Yb3+ concentration, the phosphors are capable of generating color tunable UC luminescence from yellowish green to yellow, then to orange. The tunable emission is due to the energy back transfer...
The nonlinear optical and the upconversion luminescence (UCL) properties of CsPbX3 (X = Br or its binary mixtures with Cl, I) quantum dots (QDs) are investigated by femtosecond open-aperture (OA) Z-scan and time-resolved luminescence techniques in nonresonant spectral region. The OA Z-scan results show that CsPbX3 QDs have strong reverse saturable absorption (RSA), which is ascribed to two-photon...
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