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- W2100045414 abstract "Abstract A spectroscopic study of Ho 3+ ions in Cs 2 NaGdCl 6 is reported and four strong emission bands (peaked at 493, 545, 587 and 658 nm, respectively) are observed. The 587-nm emission band is assigned to 5 G 4 → 5 I 6 transition, in accordance with the assignment made by previous works. The other three emission bands are easily assigned to 5 F 3 → 5 I 8 , ( 5 F 4 , 5 S 2 )→ 5 I 8 , and 5 F 5 → 5 I 8 transitions, respectively. The emission intensity dependence on Ho 3+ concentration is also presented. It is found that the first three emission bands are quenched almost completely when the concentration x of Ho 3+ ions in Cs 2 NaGd 1− x Ho x Cl 6 is larger than 0.5, but that of 658-nm emission band always increases with concentration. The two efficient cross-relaxations 5 F 3 + 5 I 8 → 5 F 5 + 5 I 7 and 5 G 4 + 5 I 8 → 5 F 3 + 5 I 7 are responsible for the phenomenon. In addition, an exploration of the visible to ultraviolet energy upconversion in Cs 2 NaGd 1− x Ho x Cl 6 is carried out. Upon blue ( λ exc =457.9 nm) laser excitation, a quite strong ultraviolet upconversion emission band, ranging between 320 and 340 nm, is observed in Cs 2 NaGd 1− x Ho x Cl 6 ( x =0.05 to 1.0) for the first time . This upconversion emission is attributed to the 5 D 4 ′→ 5 I 5 transition and the excited-state absorption (ESA) upconversion is presumed to be the main mechanism." @default.
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- W2100045414 date "2003-10-01" @default.
- W2100045414 modified "2023-09-27" @default.
- W2100045414 title "Spectroscopic properties and blue to ultraviolet upconversion for Ho3+ ions in Cs2NaGdCl6 crystals" @default.
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- W2100045414 doi "https://doi.org/10.1016/s0925-8388(03)00383-9" @default.
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