Abstract

Spherical CeO₂:Ho³⁺/Yb³⁺ 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 CeO₂:Ho³⁺/Yb³⁺ particles exhibited intense green emission due to the ⁵F₄/⁵S₂→⁵I₈ transition of Ho³⁺ and showed weak red or near-IR peaks. In terms of achieving the highest UC emission, the optimal concentrations of Ho³⁺ and Yb³⁺ were 0.3% and 2.0%, respectively. The UC emission intensity of prepared CeO₂:Ho³⁺/Yb³⁺ 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 Yb³⁺ to Ho³⁺ was involved in the ground-state adsorption (GSA) process.

© 2019 Optical Society of Korea

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