Luminescence and up-conversion of single crystalline Lu3Al5O12:Pr3+

Band Gap Modeling of Different Ternary and Quaternary Alumina Garnet Phases Y3(AlxGa1–x)5O12 (YAGG) and Lu3(AlxGa1–x)5O12 (LuAGG). A Semiempirical Approach

“…We like to mention that, by using as the E g value for k-alumina the E g values of 7.40 or 7.67 eV estimated by DFT techniques, the range of E g values derived for LuAG is comprised between 7.28 and 7.46 eV. In both cases the estimated E g (RT) values, for the LuAGG end term ( x = 1), are in good agreement with the experimental band gap values reported in the literature or derived from experimental E exc values by means of eqs & (after correction for the difference of temperature where necessary). ,,− Analogously the choice of a fundamental band gap value for k-Ga 2 O 3 (5.42 ± 0.05 eV) instead of the optical gap ( E g,opt = 4.95 ± 0.05 eV) is supported by the good agreement between the estimated E g values and the band gap values of YGG and LuGG reported in the literature (see also the next section). − …”

“…The E g values, derived in Figure 4 for LuGG and LuAG, are in good agreement with the band gap values reported in the literature. 11,85 As evidenced in Figure 4 a value of E g1 = 7.60 eV for k-Al 2 O 3 , slightly larger than that one previously employed for modeling the ternary (Y x Al (1−x) ) 2 O 3 system, has been used in modeling the ternary (Lu x Al (1−x) ) 2 O 3 system, while the same value of E g1 = 5.47 eV, previously used in Figure 3 for k-Ga 2 O 3 , has been again employed in modeling the (Lu x Ga 1−x) ) 2 O 3 ternary system. We have to say that the E g value of k-alumina, although higher than the previous one used in fitting the YAG value, is still lower than the value of 7.67 eV recently estimated for this alumina polymorph.…”

Ambient light stimulation enabling intense and long-lasting ultraviolet-C persistent luminescence from Pr3+-doped YBO3 in bright environments

“…, BaY 4 Si 5 O 17 :Pr 3+ and Lu 2 SiO 5 :Pr 3+ ), etc. 38–45 To take it forward, a few Pr 3+ -doped UVC persistent phosphors have also been reported recently. 29–33,46,47 For example, Yang et al 30 reported Cs 2 NaYF 6 :Pr 3+ UVC persistent phosphor with a persistence time of ∼2 h in a dark environment after X-ray irradiation.…”

“…YAlO 3 and Lu 3 Al 5 O 12 :Pr 3+ ), borates (e.g., YBO 3 :Pr 3+ and LuBO 3 :Pr 3+ ), phosphates (e.g., YPO 4 :Pr 3+ ), silicates (e.g., BaY 4 Si 5 O 17 :Pr 3+ and Lu 2 SiO 5 :Pr 3+ ), etc. [38][39][40][41][42][43][44][45] To take it forward, a few Pr 3+ -doped UVC persistent phosphors have also been reported recently. [29][30][31][32][33]46,47 For example, Yang et al 30 reported Cs 2 NaYF 6 :Pr 3+ UVC persistent phosphor with a persistence time of B2 h in a dark environment after X-ray irradiation.…”

Effect of oxygen pressure on stoichiometric transfer in laser ablation of Pr3+ doped Gd2O3–Ga2O3 binary system

“…19,20,[23][24][25] Pr 3+ ion in various crystals is well known for exhibiting a very rich emission spectrum extending from the ultraviolet to the infrared region and suitable lifetimes of the excited states for shortwavelength up-conversion laser materials. 26,27 Moreover, this ion can be used as a structural probe because its fluorescence emissions from 1 D 2 and 3 P 0 levels are very sensitive to the crystal site symmetry. 28 Pr 3+ doped materials were produced a nondegenerate two wavelength upconversion excitation pathway of 1020 and 850 nm leading to visible light emission.…”