title: Study on the effects of 5d energy locations of Ce³⁺ ions on NIR quantum cutting process in Y₂SiO₅: Ce³⁺, Yb³⁺.
abstract: The effects of the 5d energy locations of Ce³⁺ centers on the NIR quantum cutting process were studied in Y₂SiO₅ with two different substitutional Y³⁺ lattice sites for Ce³⁺ and Yb³⁺. Powder XRD and Rietveld refinement were used to characterize phase purity, crystal structure, lattice parameters and occupation fractions of Y₂₋x-yCexYbySiO₅ (x = 0.002 and 0.3, y = 0-0.2). PLE and PL spectra show that both kinds of Ce³⁺ centers in Y₂x-yCexYbySiO₅ can cooperatively transfer energy to Yb³⁺-Yb³⁺ ions pair. The dependence of the integrated emission intensities of Ce³⁺ and Yb³⁺, decay lifetime (τ) of Ce³⁺, nonradiative energy transfer rate (KCe→Yb), cooperative energy transfer efficiency (ηCET) and quantum efficiency (ηQE) on the concentration of Yb³⁺ ions were studied in details. More importantly, these results demonstrate that the 5d energy locations of Ce³⁺ ions have a great influence on NIR quantum cutting process in Ce³⁺-Yb³⁺ system: the closer they are to twice the absorption energy (~20000 cm⁻¹) of Yb³⁺, the higher the cooperative energy transfer efficiency from the lowest 5d excited state of Ce³⁺ to the Yb³⁺-Yb³⁺ ions pair.
authors: Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
authors: Wenli
authors: W
authors: Zhou
authors: Jie
authors: J
authors: Yang
authors: Jing
authors: J
authors: Wang
authors: Ye
authors: Y
authors: Li
authors: Xiaojun
authors: X
authors: Kuang
authors: Jinke
authors: J
authors: Tang
authors: Hongbin
authors: H
authors: Liang