Magnetization-induced enhancement of photoluminescence in core-shell CoFe2O4@YVO4:Eu3+ composite

Abstract

Co-ferrite spinel and FeCo alloy core shell nanocomposites and mesoporous systems for multifunctional applications After the core-shell CoFe 2 O 4 @YVO 4 :Eu 3þ composite synthesized through a facile sol-gel method was magnetized under an external magnetic field of 0.25 T for 4 h, an enhancement of $56% in photoluminescence intensity was observed. The remanent magnetization of the CoFe 2 O 4 core increases the intensity of the excited charge transfer transition of VO 4 3À group in YVO 4 :Eu 3þ shell, which may enhance the probability related to the Eu 3þ radiative transition 5 D 0 -7 F 2 , yielding to a high photoluminescence. The obvious remanent-magnetization-induced enhancement in photoluminescence is helpful in developing excellent magnetic/luminescent material for the practical display devices. V C 2013 AIP Publishing LLC. [http://dx.

Optical Phenomena in Molecule-Based Magnetic Materials

“…In this context, functional solids with lanthanide dopants such as Eu 3+ , Yb 3+ , or Er 3+ ions, have attracted considerable attention. , Many approaches were developed to engineer and control the energy transfer processes in these materials which enables the modulation of the emission color, oscillation strength, and photoconversion efficiency by, e.g., changing the host matrix. In such systems, it was shown that optical phenomena can be tuned by a magnetic field, including, e.g., their emission intensity and lifetime. − Moreover, examples of related optical sensors able to remotely probe the magnetic field strength were reported. ,,, …”

Structure, Ferroelectric and Photoluminescence Properties of Eu-Doped CaBi4Ti4O15 Multifunctional Ceramics

“…[8][9][10][11] It can be noted that Eu has been introduced into many host phosphors materials to induce luminescence properties (e.g., Sr 4 Al 14 O 25 , Ba 3 Y(PO 4 ) 3 , CoFe 2 O 4 @YVO 4 , etc.). [12][13][14] Recently, several multifunctional BLSFs materials with doping by rare earth ions have been studied, and these ceramics possess simultaneously ferroelectric, piezoelectric and photoluminescence properties (e.g., Pr-doped CaBi 2 Nb 2 O 9 , Ho-doped Bi 4 Ti 3 O 12 and Eu-doped SrBi 2 Ta 2 O 9 , etc.). [15][16][17] However, to our knowledge, there are few reports on Eu-doped CBT and its multifunctional properties.…”