Lithium solubility limit in ZnGa2O4:Bi0.0013+,Li+ phosphor

Persistent luminescent and photocatalytic properties of ZnxGa2O3+x (0.8 ≤ x ≤ 1) phosphors

“…The excitation spectrum monitored at 430 nm shows a broad band from 230 nm to 280 nm with the peak position at 254 nm, which can be attributed to the charge transfer of Ga-O. 2 Under excitation with 254 nm UV, the emission spectrum of all samples consists of a broad band ranging from 390 nm to 520 nm with a maximum at 430 nm, which is originated from the self-activation center of the octahedral Ga-O group in the ZnGa 2 O 4 lattices. 2,5 Moreover, there is a weak emission peak at 500 nm which can be attributed to the 2 E A / 4 A 2 transition of Ga 3+ in the distorted octahedral.…”

“…Persistent luminescence is an optical phenomenon, whereby a material is excited with radiation and resulting in luminescent emission remains visible for a long time (seconds to hours) aer the excitation has stopped. [1][2][3] These materials are drawing more and more attention in recent years due to the great potential applications in many elds, such as emergency signage, traffic signs and in vivo bio-imaging.…”

“…Recently, zinc gallate (ZnGa 2 O 4 ) phosphor has attracted much attention for use in eld emission display (FED) and thin lm electroluminescence device (TFED), because ZnGa 2 O 4 phosphor shows higher chemical and thermal stability than sulde phosphors. 1,2 ZnGa 2 O 4 crystallizes in the normal spinel structure (Fd3m) with Ga 3+ ions occupying octahedral sites and Zn 2+ ions occupying tetrahedral sites. Its band gap is about 4.4 eV, and it exhibits a strong blue emission for material not doped with impurities.…”

“…Its band gap is about 4.4 eV, and it exhibits a strong blue emission for material not doped with impurities. 2 ZnGa 2 O 4 can also act as a host material for multicolor emitting phosphor when doped with transition metals: Cr-doped ZnGa 2 O 4 (ZnGa 2 O 4 :Cr 3+ ) for red emission 3 and Co-doped ZnGa 2 O 4 (ZnGa 2 O 4 :Co 3+ ) for reddish orange emission. 4 In addition, ZnGa 2 O 4 has excellent performance in air-pollution control.…”

Catalytic activity of bismuth doped zinc aluminate nanoparticles towards environmental remediation

“…Tabaza et al reported the effect of bismuth doping on the luminescent properties of magnesium aluminate [37]. Kim et al illustrated on the phosphorescence activities of bismuth doped zinc gallate [38]. Bismuth-based nanoparticles are reported for good photocatalytic activity [39].…”