Enhancement of photoluminescence, persistent luminescence and photocatalytic activity in ZnGa2O4 phosphors by lithium ion doping

Enhancing the Photocatalytic Activity of Sr4Al14O25: Eu2+, Dy3+ Persistent Phosphors by Codoping with Bi3+ Ions

“…Long persistent phosphors (LPP) are materials which can absorb energy from an excitation source, and then, when the excitation is removed, the absorbed energy is released by long persistent luminescence . The long persistent luminescence can last from a few minutes to several hours, this phenomenon is widely used in emergency signals, displays, decorations and recently in photocatalyst such as TiO 2− x N y to increase its light absorption .…”

Interplay between Defects and Cation Nonstoichiometry in Lithium-Substituted CdGa2O4 Leading to Multifunctional Behavior

“…To the best of our knowledge, this appears to be the highest concentration of lithium incorporated in the spinel structure at the A-site. 21,22 This could have been facilitated by the nonstoichiometry existing in the system. The lattice parameter, extracted after Le Bail refinement of PXRD patterns, indicated a decreasing trend with increasing lithium content (Figure S3 in the Supporting Information).…”

“…The lattice parameter, extracted after Le Bail refinement of PXRD patterns, indicated a decreasing trend with increasing lithium content (Figure S3 in the Supporting Information). They were 8.3360 (10), 8.2900 (21), 8.2773 (22), and 8.2576 (59) Å for 10, 20, 40, and 60 mol % of Li + -substituted samples, respectively (Figure 4a). 26 This could be understood in a straightforward manner from ionic radii considerations (Li + = 0.59 Å in fourfold coordination versus Cd 2+ = 0.78 Å in fourfold coordination).…”

“…35,39 A huge increase in the intensity of blue emission at 416, 446, and 495 nm was noted in the photoluminescence (PL) spectrum when Li + was substituted for Cd 2+ , indicating increase in oxygen vacancy concentration (Figure 6a). 22,24 In the UV−visible spectrum of nonstoichiometric spinel, absorbance beginning from ultraviolet region to near visible region with maxima at 222 and 265 nm was noted (Figure 6b). Using the Kubelka−Munk function, the estimated band gap was 3.1 eV, which was closer to the value of 3.07 eV reported earlier for stoichiometric CdGa 2 O 4 .…”

Hydrothermal synthesis of spindle shaped hierarchical ZnGa 2 O 4 architectures and their photocatalytic activity

“…ZnGa 2 O 4 is also a kind of potential transparent conductive oxide when transparency through the violet to the near UV region is desired [8]. Recently, ZnGa 2 O 4 is proved to be an effective photocatalyst for water splitting and environmental purification [9][10][11][12][13][14][15].…”