Infrared, visible and upconversion emission of CaAl12O19 powders doped with Er3+, Yb3+ and Mg2+ ions

Concentration and pump power-mediated color tunability, optical heating and temperature sensing via TCLs of red emission in an Er3+/Yb3+/Li+ co-doped ZnGa2O4 phosphor

“…As was mentioned earlier, the addition of some surface modiers greatly affects the intensity of different phosphor materials, e.g., Li + , Mn 2+ , Mg 2+ , Zn 2+ , Ce 3+ , and Bi 3+ . [37][38][39][40][41] It has been observed earlier that they enhance the intensity of the materials by modifying the local crystal eld around the activator ions. 6,69 The modication in the local crystal eld is achieved when larger ionic radii ion is incorporated at the sites of smaller ionic radii ion.…”

“…Nowadays, researchers are encouraged to produce efficient sources of Er 3+ /Yb 3+ co-doped phosphor materials by incorporating some additional ions, such as Li + , Mn 2+ , Mg 2+ , Zn 2+ , Ce 3+ , and Bi 3+ . [37][38][39][40][41] They are known as surface modiers and are helpful in improving the UC emission intensity by modifying the local crystal structure. Out of these ions, the Li + ion has been widely incorporated in different combinations of Er 3+ /Yb 3+ codoped phosphor materials.…”

Up‐Conversion Fluorescent Labels for Plastic Recycling: A Review

“…Mg 2+ : Singh et al demonstrated co‐doping with 5 mol% Mg 2+ (72 pm in six‐fold coordination) in CaAl 12 O 19 :5Yb 3+ ,3Er 3+ micro‐crystals greatly enhances both green (≈4‐fold) and red (≈1.5‐fold) UC emission intensity of Er 3+ . Mg 2+ is supposed to displace the Al 3+ sites in CaAl 12 O 19 which lowers the local symmetry surrounding Er 3+ leading to an enhanced radiative relaxation probability of Er 3+ …”

Electron paramagnetic resonance and photoluminescence investigation on ultraviolet-emitting gadolinium-ion-doped CaAl12O19 phosphors

“…More recently, Singh et al [28] reported the effect of co-doping with Yb 3+ and Mg 2+ ions in the CaAl 12 O 19 :Er 3+ matrix on the photoluminescence intensity. It is to be noted that Gd 3+ -doped alkaline earth aluminates are less studied as compared to other trivalent rare earths ion doped phosphors and an extensive spectroscopic study of this ion does not exist particularly in CaAl 12 O 19 host.…”