Enhancement of the photoluminescence and long afterglow properties of Sr₂MgSi₂O₇:Eu²⁺ phosphor by Dy³⁺ co‐doping

Abstract

Sr2MgSi2O7:Eu(2+) and Sr2MgSi2O7:Eu(2+),Dy(3+) long afterglow phosphors were synthesized under a weak reducing atmosphere by the traditional high temperature solid state reaction method. The synthesized phosphors were characterized by powder X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), and photo-, thermo- and mechanoluminescence spectroscopic techniques. The phase structure of the sintered phosphor was an akermanite type structure, which belongs to tetragonal crystallography. The thermoluminescence properties of these phosphors were investigated and compared. Under ultraviolet light excitation, the emission spectra of both prepared phosphors were composed of a broad emission band peaking at 470 nm. When the Sr2MgSi2O7:Eu(2+) phosphor was co-doped with Dy(3+), the photoluminescence (PL), afterglow and mechanoluminescence (ML) intensity were strongly enhanced. The decay graph indicated that both the sintered phosphors contained fast decay and slow decay processes. The ML intensities of Sr2MgSi2O7:Eu(2+) and Sr2MgSi2O7:Eu(2+),Dy(3+) phosphors were increased proportionally with increasing impact velocity, a finding that suggests that these phosphors could be used as sensors to detect the stress of an object.

RETRACTED: Luminescence enhancement of bluish-green Sr2Al2SiO7:Eu2+ phosphor by dysprosium co-doping

“…The results illustrate that both of them are broadband spectra. The excitation broad band due to transitions of Eu 2+ between the (4f 7 ) ground state to the excited state 4f 6 5d 1 [(4f 7 )→4f 6 5d 1 ] configuration were observed under the ultra violet excitation[41]. As we could see from theFig.…”

Europium doped di-calcium magnesium di-silicate orange–red emitting phosphor by solid state reaction method

“…A drop of this dispersed suspension was put onto 200-mesh carbon coated copper grid and then dried into the air. An EDX spectra was used for the elemental analysis of the prepared phosphor (Sahu, Bisen, Brahme & Ganjir 2015c). FTIR spectra were recorded with the help of IR Prestige-21 by SHIMADZU for investigating the functional group (4000e1400 cm À1 ) as well as the finger print region (1400e400 cm À1 ) of sintered phosphor by mixing the sample with potassium bromide (KBr, AR grade).…”

Enhanced luminescence performance of Sr2MgSi2O7:Eu2+ blue long persistence phosphor by co-doping with Ce3+ ions

“…At the same time, the high stabilities, such as resistance of water, thermal stability are also very important for the application of ML. More ML phosphors with strong ML intensity and high stability are needed [13,14]. The Sr 2 MgSi 2 O 7 :Eu 2?…”