Photoluminescence properties of Eu3+:MgAl2O4 powder phosphor

Omkaram, I.; Rao, B. Vengala; Buddhudu, S.

doi:10.1016/j.jallcom.2008.06.140

Cited by 109 publications

(72 citation statements)

References 42 publications

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“…Rare earth doped luminescent materials find practical applications such as detectors, tunable LED's CFL, FEDs etc [3][4][5][6][7]. Among the rare earth ions, trivalent europium (Eu 3 þ ) has been recognized as an efficient red luminescent phosphor due to its 5 D 0 -7 F j (j ¼0, 1, 2, 3 and 4) transitions [8,9].…”

Section: Introductionmentioning

confidence: 99%

100MeV Si8+ ion induced luminescence and thermoluminescence of nanocrystalline Mg2SiO4:Eu3+

Prashantha¹,

Lakshminarasappa²,

Singh³

2012

Journal of Luminescence

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a b s t r a c tNanoparticles of Mg 2 SiO 4 :Eu 3 þ have been prepared by the solution combustion technique and the grain size estimated by PXRD is found to be in the range 40-50 nm. Ionoluminescence (IL) studies of Mg 2 SiO 4 :Eu 3 þ pellets bombarded with 100 MeV Si 8 þ ions with fluences in the range 1.124-22.48 Â 10 12 ions cm À 2 are carried out at IUAC, New Delhi, India. Five prominent IL bands with peaks at 580 nm, 590 nm, 612 nm, 655 nm and 705 nm are recorded. These characteristic emissions are attributed to the luminescence centers activated by Eu 3 þ cations. It is found that IL intensity decreases rapidly in the beginning. Later on, the intensity decreases slowly with further increase of ion fluence. The reduction in the ionoluminescence intensity with increase of ion fluence might be attributed to degradation of Si-O (n 3 ) and Si-O (2n 3 ) bonds present on the surface of the sample. The red emission with peak at 612 nm is due to characteristic emission of 5 D 0 -7 F 2 of the Eu 3 þ cations. Thermoluminescence (TL) studies of Mg 2 SiO 4 :Eu 3 þ pellets bombarded with 100 MeV Si 8 þ cations with fluences in the range 5 Â 10 11 ions cm À 2 to 5 Â 10 13 ions cm À 2 are made at RT. Two prominent and well resolved TL glows with peaks at $ 220 1C and $ 370 1C are observed. It is observed that TL intensity increases with increase of ion fluence. This might be due to creation of new traps during swift heavy ion irradiation.

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Section: Introductionmentioning

confidence: 99%

100MeV Si8+ ion induced luminescence and thermoluminescence of nanocrystalline Mg2SiO4:Eu3+

Prashantha¹,

Lakshminarasappa²,

Singh³

2012

Journal of Luminescence

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“…Among them, silicates have attracted much attention because of their chemical and physical stability. Nowadays, there has been increasing interest in fabricating phosphors activated by rare earth ions in the development of various optical devices, such as fluorescent tubes, color televisions, and glass lasers [1][2]. In these devices, luminescent materials absorb energy generated from cathode ray or ultraviolet (UV) radiation and then convert it to visible light.…”

Section: Introductionmentioning

confidence: 99%

Luminescence properties of red-emitting Ca2Al2SiO7:Eu3+ nanoparticles prepared by sol-gel method

2011

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A series of red-emitting Ca 2−x Al 2 SiO 7 :xEu 3+ (x = 1 mol.%-10 mol.%) phosphors were synthesized by the sol-gel method. The effects of annealing temperature and doping concentration on the crystal structure and luminescence properties of Ca 2 Al 2 SiO 7 :Eu 3+ phosphors were investigated. X-ray diffraction (XRD) profiles showed that all peaks could be attributed to the tetragonal Ca 2 Al 2 SiO 7 phase when the sample was annealed at 1000°C. Scanning electron microscopy (SEM) micrographs indicate that the phosphors have an irregularly rounded morphology with particles of about 200 nm. Excitation spectra showed that the strong broad band at around 258 nm and weak sharp lines in 350-490 nm were attributed to the charge transfer band of Eu 3+ −O 2− and f-f transitions within the 4f 6 configuration of Eu 3+ ions, respectively. Emission spectra implied that the red luminescence could be attributed to the transitions from the 5 D 0 excited level to the 7 F J (J = 0, 1, 2, 3, 4) levels of Eu 3+ ions with the main electric dipole transition 5 D 0 → 7 F 2 (618 and 620 nm), and Eu 3+ ions prefer to occupy a lower symmetry site in the crystal lattice. Moreover, the photoluminescence (PL) intensity was strongly dependent on both the sintering temperature and doping concentration, and the highest PL intensity was observed at an Eu 3+ concentration x = 7 mol.% after annealing at 1100°C. The obtained Ca 2 Al 2 SiO 7 :Eu 3+ phosphor may have potential application for the red lamp phosphor.

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“…8. It was found that the Dy 3+ intensity increases with increase in (32). Therefore, it can be seen that the optimum concentration of Dy 3+ in LiBaPO 4 is 0.015.…”

Section: +mentioning

confidence: 85%

Photoluminescence properties of LiBaPO₄:M³⁺ phosphor for near‐UV light‐emitting diode (M = Eu and Dy)

Puppalwar¹,

Dhoble

2015

Luminescence

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A novel phosphor LiBaPO4 doped with rare earths Eu and Dy prepared by high temperature solid-state reaction method is reported. The phosphors were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL). The emission and excitation spectra of these materials were measured at room temperature with a spectrofluorophotometer. The excitation spectra of LiBaPO4:Eu(3+) phosphor can be efficiently excited by 394 nm, which is matched well with the emission wavelength of near-UV light-emitting diode (LED) chip. PL properties of Eu(3+)-doped LiBaPO4 exhibited the characteristic red emission coming from (5) D0 → (7) F1 (593 nm) and (5) D0 → (7) F2 (617 nm) electronic transitions with color coordinations of (0.680, 0.315). The results demonstrated that LiBaPO4:Eu(3+) is a potential red-emitting phosphor for near-UV LEDs. Emission spectra of LiBaPO4:Dy(3+) phosphors showed efficient blue (481 nm) and yellow (574 nm) bands, which originated from (4) F9/2 → 6) H15/2 and (4) F9/2 → (6) H13/2 transitions of the Dy(3+) ion, respectively. The 574 nm line is more intense than the 481 nm lines, which indicates that the site Dy(3+) is located with low symmetry. This article summarizes fundamentals and possible applications of optically useful inorganic phosphates with visible photoluminescence of Eu(3+) and Dy(3+) ions.

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Photoluminescence properties of Eu3+:MgAl2O4 powder phosphor

Cited by 109 publications

References 42 publications

100MeV Si8+ ion induced luminescence and thermoluminescence of nanocrystalline Mg2SiO4:Eu3+

100MeV Si8+ ion induced luminescence and thermoluminescence of nanocrystalline Mg2SiO4:Eu3+

Luminescence properties of red-emitting Ca2Al2SiO7:Eu3+ nanoparticles prepared by sol-gel method

Photoluminescence properties of LiBaPO₄:M³⁺ phosphor for near‐UV light‐emitting diode (M = Eu and Dy)

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Photoluminescence properties of Eu3+:MgAl2O4 powder phosphor

Cited by 109 publications

References 42 publications

100MeV Si8+ ion induced luminescence and thermoluminescence of nanocrystalline Mg2SiO4:Eu3+

100MeV Si8+ ion induced luminescence and thermoluminescence of nanocrystalline Mg2SiO4:Eu3+

Luminescence properties of red-emitting Ca2Al2SiO7:Eu3+ nanoparticles prepared by sol-gel method

Photoluminescence properties of LiBaPO4:M3+ phosphor for near‐UV light‐emitting diode (M = Eu and Dy)

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Photoluminescence properties of LiBaPO₄:M³⁺ phosphor for near‐UV light‐emitting diode (M = Eu and Dy)