Versatile deep-red Mg2TiO4:Mn4+ phosphor for photoluminescence, thermometry, and latent fingerprint visualization

Interpol review of fingermarks and other body impressions 2016–2019

“…All the articles below refer to the application of micron-sized particles. Preliminary/Pilot studies : Several kinds of compounds were proposed to detect fingermarks on non-porous substrates through powder dusting: ABC dry fire extinguisher powder [ 354 ], Fuller’s earth [ 355 ], anthracene and naphthalene [ 356 ], BaTiO 3 :Dy 3+ microspheres [ 357 ], chitosan-tripolyphosphate microparticles [ 358 ], La 2 (MoO 4 ) 3 :Eu 3+ microcrystals [ 359 ], phenyl-doped graphitic carbon nitride [ 360 ], bis(salicylidene)cyclohexyl-1,2-diamino zinc(II) complex [ 361 ], functionalized montmorillonite [ 362 , 363 ], carbon dot@TiO 2 core-shell composite [ 288 ], household powders such as gram flour, coriander, cumin or black pepper [ 364 ], Ca 4 (PO 4 ) 2 O:Eu 2+ phosphors [ 365 ], Eu(Phen) 2 complex intercalated clay hybrids [ 366 ], AIE-based magnetic powder doped with tetraphenylethene derivatives [ 367 ], pyrene [ 368 ], silica microparticles coated with phenanthro imidazole derivative [ 369 ], europium (III) coordination polymer [ 370 ], Yb 3+ /Er 3+ co-doped ceramics presenting upconversion properties [ 371 ], cationic dye – diatomite composite [ 372 ], benzazole-doped silica microparticles [ 373 ], Yb 3+ /Er 3+ /Tm 3+ doped fluorides presenting upconversion properties [ 374 ], porous graphitic carbon nitride [ 375 ], YBO 3 :Eu 3+ /Tb 3+ phosphors [ 376 ], Mg 2 TiO 4 :Mn 4+ phosphor [ 377 ], carbazolyl-based phosphor [ 378 ], and AIE-based imidazole derivatives [ 379 ]. It should be emphasized that several of these studies are conducted with an extremely low number of donors leaving fresh, sebum-rich fingermarks.…”

Mg2TiO4 spinel modified by nitrogen doping as a Visible-Light-Active photocatalyst for antibacterial activity

“…Its good dielectric properties such as very low dielectric loss has gained considerable interest in the field of modern communication as filters, oscillators, dielectric substrate, wave guides and antennas etc [22] , [23] , [24] . Pristine Mg 2 TiO 4 is a typical n-type semiconductor whose optical and electrical properties can be facilely tuned by structural or compositional modifications [25] , [26] , [27] . Previous studies suggested that Mg 2 TiO 4 has a cubic symmetry with nearly perfect inverse spinel structure at high temperatures, i.e.…”

Red Zn2SiO4:Eu3+ and Mg2TiO4:Mn4+ nanophosphors for on-site rapid optical detections: Synthesis and characterization

“…Because the characteristics of the control molecule, MTO:Mn 4+ phosphor, were described [ 46 ], this study only investigated the crystallization and luminescence properties of the ZSO:Eu 3+ nanophosphor. Figure 1 a shows the XRD patterns of ZSO:Eu 3+ doped with different Eu 3+ concentrations and synthesized at 1100 °C for 1 h. The crystalline structure of the ZSO:Eu 3+ matched well the standard single-phase willemite (rhombohedral) structure of Zn 2 SiO 4 (JCPDS No.…”

“…The MTO:Mn 4+ phosphor was prepared via a citric acidassisted sol-gel process using the following raw materials: [46]. When the MTO:Mn 4+ was doped with 0.1 mol% of Mn 4+ and annealed at 1300 °C for 5 h, the highest red luminescence was obtained.…”

“…The MTO:Mn 4+ phosphor was prepared via a citric acid-assisted sol–gel process using the following raw materials: Mg(NO 3 ) 2 ∙6H 2 O (99%; Acros), Ti[O(CH 2 ) 3 CH 3 ] 4 (99%; Alfa), Mn(NO 3 ) 2 ∙4H 2 O (Acros), citric acid C 3 H 4 (OH)(COOH) 3 (99.5%; Showa), anhydrous alcohol C 2 H 5 OH (99.5%; ECHO), and DI water [ 46 ]. When the MTO:Mn 4+ was doped with 0.1 mol% of Mn 4+ and annealed at 1300 °C for 5 h, the highest red luminescence was obtained.…”