Visible emission and energy transfer in Tb³⁺/Dy³⁺ co‐doped phosphate glasses

Abstract

In this work, we systematically study the spectroscopic properties of Tb 3+ /Dy 3+ codoped phosphate glasses in the visible spectral region and explore the sensitization role of Dy 3+ in the enhancement of visible fluorescence of Tb 3+ ions. Judd-Ofelt parameters Ω 2 and Ω 4 /Ω 6 of the phosphate glass as host for Tb 3+ are calculated as 21.60 × 10-20 cm 2 and 0.73, respectively, based on the measured spectral absorption. Multiple energy transfer (ET) routes from Dy 3+ to Tb 3+ and their efficiencies are characterized, and the enhanced fluorescence properties of Tb 3+ are investigated, including the emission spectral strength and the spontaneous emission lifetime as functions of Dy 3+ doping concentration. The efficient nonradiative ET processes between Dy 3+ and Tb 3+ allow a moderate concentration level of Tb 3+ to achieve favorably stronger spectral absorption at blue and ultraviolet wavelengths. Tb 3+ /Dy 3+ co-doped phosphate glass shows promising potential for phosphors and lasing operation at visible wavelengths.

Energy Transfer in Dy3+ and Tb3+ Double-Doped Barium Borate Glass

“…Compared to other glass systems [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ], the energy transfer is of special interest here. As can be seen in Figure 6 a, Tb shows almost no emission when excited with a Dy -related excitation wavelength, i.e., 452 .…”

Photoluminescence Properties and Lasing Performance of Dy3+/Tb3+ Co-Doped Antimony Phosphate Glasses

“…Generally speaking, a larger absorption cross section (σ a ) is more conducive to light absorption. We have calculated the absorption cross sections using the following formula: 13,23 can be observed in the energy level diagram of Dy 3+ /Tb 3+ ions, as shown in Fig. 2.…”

“…Recently, Shanghai Institute of Optics and Fine Mechanics also demonstrated visible luminescence and realized green lasing in Dy 3+ /Tb 3+ co-doped phosphate glasses. 13 It indicated that Dy 3+ ion played the role of sensitizer for the visible emission and lasing of Tb 3+ ions.…”

“…In this study, we focused on the luminescence properties of PDTs and discussed the ET from Dy 3+ to Tb 3+ . Simultaneously, we choose 450 nm semiconductor pump light, whose price and power are cheaper and higher than the 350 nm, 377 nm 13 and 423 nm 18 pump light used in other studies. The longer lifetimes around 545 nm were determined and the laser performance was evaluated in our phosphate glasses.…”

Effect of P/Al ratio on the X‐ray induced darkening in Dy‐doped silica glasses at visible wavelengths

“…Figure 1. As demonstrated by Tomoya Okazaki et al,18 the absorption band centered at shorter than 210 nm (photon energy higher than 6 eV) is ascribed to the transition of Dy 3+ : 4f-4f5d that shows much higher absorption cross section23 than 4f-4f transitions 24. The UV absorption edge of Dy-silica glasses shows dependence on P/Al ratio.…”