Garnet transparent ceramic film of Y3Al5O12:Eu3+ fabricated through an interface reaction of layered rare-earth hydroxide nanosheets on amorphous alumina

High-Entropy Layered Rare Earth Hydroxides

“…In recent years, much attention has been paid to high-entropy RE-containing mixed oxides such as perovskites, , tantalites, tantalates, , niobates, , silicates, zirconates, − molybdates, and aluminates , due to their high potential as advanced ceramic materials possessing improved mechanical, thermal, and electrical properties . Cerium-based RE oxides with a fluorite structure have attracted researchers’ interest − since their semiconducting property can easily be tuned by chemical composition .…”

Incorporation of Eu3+ in ZnGa2O4:Ni2+ for improved NIR persistent luminescence located in second transparency window

“…According to the reports, 24,25 the other bands centered at 361, 392, and 464 nm corresponding to the transitions 7 F 0 → 5 D 4 , 7 F 0 → 5 L 6 , and 7 F 0 → 5 D 2 of Eu 3+ ions, respectively. Under excitation with 282 nm UV light, the ZGE phosphors show sharp lines from 550 to 750 nm, which are related to the typical transition of Eu 3+ from the excited 5 D 0 to 7 F J ( J = 1, 2, 3, 4) emission states with the 5 D 0 → 7 F 2 red one being the most prominent 25,26 . As shown in the inset of Figure 3, the emission intensity gradually increases with increasing the content of Eu 3+ , however, it gradually decreases with further increasing the concentration of Eu 3+ after the intensity reaching a maximum value when y = 0.02.…”

“…In addition, the electrons of Eu 3+ ions are first excited from the ground state 7 F 0 to the excited states 5 D J ( J = 1, 2, 3, 4) and then the electrons partly relax to the lowest excited state 5 D 0 . Finally, they return to the ground state through radiative transitions, thus contributing to a red emission at 616 nm 25,26 . Meanwhile, part energy transits from 5 D 0 of Eu 3+ to 3 T 1 ( 3 F) of adjacent Ni 2+ ions, making the NIR emission of Ni 2+ improve.…”

“…Finally, they return to the ground state through radiative transitions, thus contributing to a red emission at 616 nm. 25,26 Meanwhile, part energy transits from 5 D 0 of Eu 3+ to 3 T 1 ( 3 F) of adjacent Ni 2+ ions, making the NIR emission of Ni 2+ improve.…”

“…The decay of fluorescence lifetime is the direct evidence of the existence of energy transfer. 19,20,26 Figure 6A-C show fluorescence decay curves of ZGEN samples (x = 0, 0.003, and 0.005). It can be seen that fluorescence lifetime gradually decreases with the increase of Ni 2+ concentration.…”