Hoang Manh Ha, Tran Thi Quynh Hoa, Le Van Vu, Nguyen Ngoc Long

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Abstract

Abstract: Ho3+, Pr3+ co-doped LaF3 nanocrystals have been prepared by hydrothermal method. The nanocrystals possess hexagonal structure with  space group with lattice parameters a = 7.17 ± 0.01 Å and c = 7.33 ± 0.01 Å. The room temperature absorption, photoluminescence (PL) and photoluminescence excitation (PLE) spectra of LaF3:Ho3+, Pr3+ were investigated in detail. It was discovered that the PL and PLE of Ho3+ and Pr3+ ions resulted from the optical intra-configurational f-f transitions. The PL spectra are attributed to the transitions 5F3, 5S2 +5F4 and 5F55I8 in Ho3+ ion and the transitions 3P03H5, 1D23H4, 3P03H6, 3F2 and 3F4 in Pr3+ ion. The optical transitions 5I85F5, 5F4, 5F3, 3K8, 5F1, 5G5, 3K7 and 3H6 in Ho3+ ion and the optical transitions 3H4 3P2 , 3P1, 3P0 and 1D2 in Pr3+ ion have been clearly observed not only in the PLE spectra, but also in the absorption spectra.


Keywords: LaF3:Ho3+, Pr3+ nanocrystals, rare-earth, hydrothermal, absorption, photoluminescence.