Multi-color emission tunability and energy transfer studies of YAl3(BO3)4:Eu3+/Tb3+ phosphors

Optical spectroscopy of Eu3+ ions doped in YAl3 (BO3)4 crystal

“…The calculated value of the quantum efficiency ε QE = = is around 35 %. This value is in good agreement with that obtained for Eu 3+ ion YAB codoped Eu/Tb doped in glass compounds [5] (table 10).…”

“…It presents many optical applications when doped with rare earth ions like Sm 3+ , Yb 3+ , Tb 3+ , Dy 3 ,Tm 3+ , Gd 3+ and Eu 3+ [3][4][5][6][7][8]. The optical properties of rare earth ions (Tm 3+ , Sm 3+ , Er 3+ ) in YAB host have been studied in our previous work and the crystal field parameters were calculated [9][10][11][12].…”

“…The problem of applicability of Judd-Ofelt analysis is due to the overlapping of the transition originating from 7 F 0 and 7 F 1 levels of Eu 3+ ions. The Judd Ofelt parameters of Eu 3+ ions are calculated in codoped (Eu 3+ , Tm 3+ ) YAB host, where only the Ω 2 and Ω 4 parameters were calculated by Lokeswara and al [5] based on 5 D 0  7 F 2 , 7 F 4 emission transitions. However, there is no a complete interpretation of Eu 3+ doped YAB absorption and emission spectra in order to calculate the Judd-Ofelt parameters.…”

Improved photoluminescence properties of BaAl 2 Si 2 O 8 :Eu 3+ ,Tb 3+ phosphors by doping Tb 3+

“…The broad bands at 200 -350 nm consist of two peaks centered at 270 and 305 nm. The sharp absorption peaks centered at 361, 380, 393, 412, 463, and 530 nm are observed due to the 7 F 0 → 5 D 4 , 7 F 0 → 5 L 7 , 7 F 0 → 5 L 6 , 7 F 0 → 5 D 3 , 7 F 0 → 5 D 2 , and 7 F 0 → 5 D 1 transitions of Eu 3+ [24,25,27,28]. The emission spectra of Ba 0.88-x Al 2 Si 2 O 8 :0.12Eu 3+ ,xTb 3+ (0≤x≤0.12) phosphors under 393 nm excitation are shown in Fig.…”

“…Subsequently, the excited energy ( 5 D 1 ) of Eu 3+ is transferred to the lower excited energy state of Eu 3+ ( 5 D 1 → 5 D 0 ) by non-radiative relaxation[33,34]. After the non-radiative relaxation, the Eu 3+ ions cascade from the energy state increase in red emission intensity[28]. We believe that the incorporation of Tb3+ to the Ba 0.88 Al 2 Si 2 O 8 :0.12Eu 3+ phosphor is a highly promising way for enhancing PL properties.…”