Luminescence and electron paramagnetic resonance investigation on ultraviolet emitting Gd doped MgAl2O4 phosphors

Singh, Vijay; Sivaramaiah, G.; Rao, J.L.; Kim, S.H.

doi:10.1016/j.jlumin.2013.03.054

Cited by 62 publications

(23 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ions. The excited states which could be observed are 6 P J , 6 I J and 6 D J [7]. Therefore, bands at about 240 and 276 nm are related to the f-f transitions of Gd 3? ion, which correspond to the transitions of 8 S 7/2 ?…”

Section: Xrd and Dta-tg Analysesmentioning

confidence: 88%

“…6 D 3/2 and 8 S 7/2 ? 6 I 9/2 and/or 6 I 17/2 , respectively [7,10,34]. The glass matrix and its optically active defects, e.g.…”

Section: Xrd and Dta-tg Analysesmentioning

confidence: 99%

“…In particular, the remarkable narrow band emission lines, large Stokes shift between excitation and emission of the trivalent rare-earth ions have been utilized to the maximum extent in the development of efficient phosphors. In general, luminescence observed in phosphor materials are attributed to the f-f or f-d transitions of rare earth ions [7]. Among rare-earth ions, gadolinium ions doped materials are of great importance because of their possible applications in the lighting industry.…”

Section: Introductionmentioning

confidence: 99%

“…These phosphors find microwave applications and optical applications such as substrate material for magneto-optical films. These phosphors were used for imitation of diamonds and for computer bubble memory [7]. Presently, phosphor-converted white lightemitting diodes (LEDs) have stepped into lighting market due to their high efficiency, energy saving, high reliability, long life, low cost and convenient manufacturing methods [8].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Sol–gel synthesis, paramagnetism, photoluminescence and optical properties of Gd-doped and Bi–Gd-codoped hybrid organo-silica glasses

Abo-Naf

Abdel-Hameed

Marzouk

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Multifunctional phosphors possessing paramagnetic and semiconducting properties have been synthesized by the sol-gel method. These phosphors are composed of Gd-doped and Bi-Gd-codoped hybrid ethylene glycol (EG)-modified silica glasses. The chemical composition of these hybrids is constituted from 1.5:1 molar ratio of EG:silica, doped with 3 mol% of Gd 2 O 3 in case of the Gd-doped hybrid and with 3 mol% of both of the Bi 2 O 3 and Gd 2 O 3 in case of the Bi-Gd-codoped hybrid. The synthesized hybrid glasses, in the form of transparent and crack-free bulk samples, were analyzed with powder X-ray diffraction, differential thermal analysis coupled with thermogravimetry, vibrating sample magnetometer (VSM), Fourier transform infrared and ultraviolet-visible spectroscopy. Paramagnetic behavior of the glasses was confirmed with VSM results. Absorption properties of the Gd-doped glass in the UV region have three characteristic peaks at 240, 276 and 352 nm. Introduction of bismuth produces additional band at 423 nm in the visible region. Photoluminescence of the glasses was investigated by excitation and emission spectroscopy. Interestingly, excited states other than f-f states are emphasized. Upon UV light excitation at 204 and 274 nm, the Gd-doped glass exhibits phosphorescence visible triplet; blue, green and red; emissions. Under UV light excitation at 304 nm, only blue emission was obtained. These emissions originate from the low-energy intraligand (IL) emissions induced by the Gd 3? in the EG ligand due to the heavy-atom effect and paramagnetism of Gd 3? ions. Incorporation of Bi 3? increases the intensity of Gd-EG-IL emissions and, thus, controls over the luminescence intensity of blue, green and red emissions to achieve white overall emission.

show abstract

Section: Xrd and Dta-tg Analysesmentioning

confidence: 88%

“…6 D 3/2 and 8 S 7/2 ? 6 I 9/2 and/or 6 I 17/2 , respectively [7,10,34]. The glass matrix and its optically active defects, e.g.…”

Section: Xrd and Dta-tg Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sol–gel synthesis, paramagnetism, photoluminescence and optical properties of Gd-doped and Bi–Gd-codoped hybrid organo-silica glasses

Abo-Naf

Abdel-Hameed

Marzouk

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…Singh et al[66] observed an emission band at 313 nm in Gd 2 Zr 2 O 7 phosphor and was assigned to 6 P 7/2 → 8 S 7/2 transition. Also, they[64] observed an emission band at about 312 nm in the emission spectrum of Gd doped MgAl 2 O 4 phosphor. The…”

mentioning

confidence: 95%

New ultraviolet B emission from gadolinium activated BaZrO3 phosphor - An electron paramagnetic resonance and optical study

Singh

Sivaramaiah²,

Rao

et al. 2015

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

UVB‐emitting Gd³⁺‐activated M₂O₂S (where M = La, Y) for phototherapy lamp phosphors

2015

View full text Add to dashboard Cite

Gd(3+)-activated oxysulphide (M2O2S) may be used to study Photoluminescence (PL) properties with respect to phototherapy. Gd(3+)-activated phosphor materials are widely used for phototherapy lamps. The Gd(3+) ion gives characteristic Narrow-Band (NB) emissions, in particular in the ultraviolet (UV) light region, that are used to treat more than 50 types of skin diseases. In this paper, M2O2S oxysulphide doped with Gd(3+) was synthesized by the solid-state flux fusion method and its down conversion spectral properties were studied as a function of different Gd(3+) concentrations. The sample was characterized by X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and PL and the crystal structure was also studied. The lanthanum oxysulphide (La2O2S)-activated Gd(3+) ion showed a sharp emission peak at 314 nm when excited at 275 nm excitation, whereas the yttrium oxysulphide (Y2O2S)-activated Gd(3+) ion showed a sharp emission at 316 nm when excited by 272 nm. The effect of concentration of the Gd(3+) ion on the luminescence properties of M2O2S:Gd(3+) phosphor was also studied. These phosphor materials activated with the Gd(3+) ion may be suitable for phototherapy lamps, which are used to treat many types of skin diseases such as psoriasis, vitiligo, or scleroderma.

show abstract

Luminescence and electron paramagnetic resonance investigation on ultraviolet emitting Gd doped MgAl2O4 phosphors

Cited by 62 publications

References 45 publications

Sol–gel synthesis, paramagnetism, photoluminescence and optical properties of Gd-doped and Bi–Gd-codoped hybrid organo-silica glasses

Sol–gel synthesis, paramagnetism, photoluminescence and optical properties of Gd-doped and Bi–Gd-codoped hybrid organo-silica glasses

New ultraviolet B emission from gadolinium activated BaZrO3 phosphor - An electron paramagnetic resonance and optical study

UVB‐emitting Gd³⁺‐activated M₂O₂S (where M = La, Y) for phototherapy lamp phosphors

Contact Info

Product

Resources

About

Luminescence and electron paramagnetic resonance investigation on ultraviolet emitting Gd doped MgAl2O4 phosphors

Cited by 62 publications

References 45 publications

Sol–gel synthesis, paramagnetism, photoluminescence and optical properties of Gd-doped and Bi–Gd-codoped hybrid organo-silica glasses

Sol–gel synthesis, paramagnetism, photoluminescence and optical properties of Gd-doped and Bi–Gd-codoped hybrid organo-silica glasses

New ultraviolet B emission from gadolinium activated BaZrO3 phosphor - An electron paramagnetic resonance and optical study

UVB‐emitting Gd3+‐activated M2O2S (where M = La, Y) for phototherapy lamp phosphors

Contact Info

Product

Resources

About

UVB‐emitting Gd³⁺‐activated M₂O₂S (where M = La, Y) for phototherapy lamp phosphors