Up-conversion luminescence characterization of CeO2:Ho3/Yb3 particles prepared by spray pyrolysis

다국어 초록 (Multilingual Abstract)

Spherical CeO 2 :Ho 3+ /Yb 3+ particles were synthesized using spray pyrolysis, and the upconversion (UC) properties were investigated with changing the preparation conditions and the infrared pumping power.
The resulting particles had a size of about 1 µm and hollow structure. The prepared CeO 2 :Ho 3+ /Yb 3+particles exhibited intense green emission due to the 5 F 4 / 5 S 2 → 5 I 8 transition of Ho 3+ and showed weak red or near-IR peaks. In terms of achieving the highest UC emission, the optimal concentrations of Ho 3+and Yb 3+ were 0.3% and 2.0%, respectively. The UC emission intensity of prepared CeO 2 :Ho 3+ /Yb 3+particles had a linear relationship with crystallite size and concentration quenching was caused by dipole-dipole interaction between the same ions. Based on the dependency of UC emission on the pumping power, the observed green upconversion was achieved through a typical two-photon process and concluded that the main energy transfer from Yb 3+ to Ho 3+ was involved in the ground-state adsorption (GSA) process.

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