Judd–Ofelt analysis and spectral properties of Dy3+ ions doped niobium containing tellurium calcium zinc borate glasses

Optical Properties and White Light Emission of Dy3+ Doped Alumino Borotellurite Glasses

“…The results (Table 3) show that the radiative parameters of the ABT45 are the largest of all. These values are higher than those in some other glasses [5,6,8,16,17]. Thus, ABT:Dy 3+ glasses are found to be suitable for developing the yellow laser and fiber optic amplifier.…”

“…In NIR region, the transitions from 6 H15/2 to 6 HJ and 6 FJ are allowed by the spin selection rule (ΔS = 0), so the intensity of these transitions is often quite strong. The 6 H15/2→ 6 F11/2 transitions obeys the selection rule of |ΔJ| ≤ 2, |ΔS| = 0 and |ΔL| ≤ 2, thus this is hypersensitive transitions [6,7]. Usually, the position, shape and intensity of hypersensitive transitions in RE 3+ ions are very sensitive to the ligand coordination [8,9].…”

“…It is noted that the luminescence branching ratio characterizes the possibility of attaining stimulated emission from any specific transition, so it is a critical parameter to the laser designer and other optical applications [6,16,17,18]. Vijaya [16] and Mahamuda [17] reported that if the branching ratio of an emission transition is greater than 50 %, this transition is potentiality for laser emission.…”

“…Among various rare earth (RE) ions, Dy 3+ ion has attracted considerable and increased attention because it can alone emit nearwhite luminescence [2][3][4]. Dy 3+ ions-doped crystals and glasses have been extensively studied due to its primary intense blue (484 nm, 4 F9/2 → 6 H15/2) and yellow (575 nm, 4 F9/2 → 6 H13/2) emissions and an appropriate combination of these blue and yellow luminescence bands leads to generation of white light in the matrix [3][4][5][6][7]. These Dy 3+ -doped solid state systems can be quite easily excited by the commercial UV or blue LEDs, because their excitation spectra exhibit several 4f-4f electronic bands in the 340-480 nm spectral range [6,7].…”

“…Dy 3+ ions-doped crystals and glasses have been extensively studied due to its primary intense blue (484 nm, 4 F9/2 → 6 H15/2) and yellow (575 nm, 4 F9/2 → 6 H13/2) emissions and an appropriate combination of these blue and yellow luminescence bands leads to generation of white light in the matrix [3][4][5][6][7]. These Dy 3+ -doped solid state systems can be quite easily excited by the commercial UV or blue LEDs, because their excitation spectra exhibit several 4f-4f electronic bands in the 340-480 nm spectral range [6,7]. Furthermore, it is widely known, the basic features of Dy 3+ ions in crystalline and amorphous host matrices are so well established that these rare earth ions are extensively used as a spectroscopic probe for studying the structures and local symmetry of the solid state materials [7].…”