J = 0-6) transitions of Tb 3+ in YBO 3 :Tb under 130-290 nm excitation were systematically investigated. The results revealed that the quenching concentrations of both 5 D 3 -7 F J and 5 D 4 -7 F J transitions of Tb 3+ in YBO 3 :Tb were mainly dependent on excitation wavelength. Particularly, the quenching concentrations of 5 D 4 -7 F J transitions of Tb 3+ under 130-290 nm excitation were correlated with excitation bands of YBO 3 :Tb. The quenching concentrations of 5 D 3 -7 F J transitions remained at low concentration (2%) under 186-290 nm excitation and then increased gradually with energy of incoming excitation photon when excited at 130-186 nm. This dependence should be involved in their excitation mechanisms and quenching pathway in particular excitation region. quenching concentration, YBO 3 :Tb 3+ , 5 D 3 -7 F J , 5 D 4 -7 F JThe emission intensity of many phosphors as a function of activator concentration initially increases with activator concentration and then decreases, going through a maximum at some concentration. The decreases in emission intensity at a certain activator concentration are referred to as the phenomenon of "concentration quenching" [1,2] . And the optimal activator concentration with the highest emission intensity is considered as "quenching concentration" of phosphors. A complete characterization of the emission quenching behaviors in inorganic phosphors is very important not only for technological design but also for the basic understanding of the physical excitation processes [3][4][5][6][7] .On the other hand, YBO 3 :Tb with high absorption edge and short decay time in vacuum ultraviolet (VUV) region is an inorganic green phosphor used in plasma display panels (PDPs), Hg-free lamps and back lighting fields [8,9] . Generally, the emission of Tb 3+ consists of the 5 D 3 -7 F J and 5 D 4 -7 F J (J = 0-6) transitions. Among them, the 5 D 4 -7 F 5 transition at 543 nm is the dominant emission and mainly contributes to the green component. The presence of 5 D 3 -7 F J transitions at 380-480 nm not only decreases the emission intensity of 5 D 4 -7 F 5 transition but also leads to chromaticity problems [10] . Therefore, a fundamental study on the emission and quenching characteristics of 5 D 3 -7 F J transitions is as important as that on the 5 D 4 -7 F 5 transition for YBO 3 :Tb phosphors.In recent years, much attention has been paid to the emission characteristics of 5 D 4 -7 F 5 transition of Tb 3+ -doped phosphors [8][9][10][11][12] . However, there are few reports about the fundamental study on quenching behaviors of both 5 D 3 -7 F J and 5 D 4 -7 F J transitions of Tb 3+ -doped phosphors in VUV region.In this work, the emission characteristics of the 5 D 3 , 4 -7 F J (J=0-6) transitions of YBO 3 :Tb phosphors under
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