Structural, Magnetic, and Photoluminescence Properties of BiFeO3: Er-Doped Nanoparticles Prepared by Sol-Gel Technique

Chromium-activated ZnGa2O4 nano-sized phosphor powder was prepared by the Sol-Gel technique using citric acid as chelator, and the microstructure and luminescent property were studied. The host ZnGa2O4 belongs to the spinel structure and the ZnGa2O4:Cr3+ phosphor powder exhibited bright red emission band. The excitation bands with peak of maximum height at about 250 nm, 410 nm and 560 nm were related to the charge transfer (CT) of Ga-O, 4A2-4T1 and 4A2-4T2 transitions of Cr3+, respectively. Different quenching concentrations of the CT state and intrinsic excitation were discovered originating from different energy transfer schemes. Meanwhile, with the increasing of the calcining temperature the PLE spectrum exhibited an obvious blue-shift which is attributed to the enhancement of the crystal field.

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Photoluminescence Properties of Zn2SiO4:Mn 2+ Inverse Opals

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.280-283.541 ◽

2007 ◽

Vol 280-283 ◽

pp. 541-544

Author(s):

Bo Li ◽

Ji Zhou ◽

Rui Long Zong ◽

Long Tu Li

Keyword(s):

Self Assembly ◽

Sol Gel ◽

Photoluminescence Properties ◽

Polystyrene Spheres ◽

Inverse Opals ◽

Β Phase ◽

Α Phase ◽

Gel Technique ◽

Dominant Phase ◽

Opal Template

Mn2+-doped Zn2SiO4 inverse opals were synthesized by sol-gel technique combined with the self-assembly of the opal template. Zn2SiO4:Mn2+ precursors were infiltrated into the interstices of the opal template assembled by polystyrene spheres. The polystyrene template was removed by calcining and nanocrystals of Mn2+-doped Zn2SiO4 were obtained in the void of opal template. The inverse opals show photonic crystal behavior and emit yellow light initially with the luminescent peak at 562 nm corresponding with the fact that β-phase is the dominant phase for nanocrystals less than 30nm. As the β-phase transformed to α-phase with the gradual increase of treating temperature and the growth of the crystal, the luminescence from Zn2SiO4:Mn2+ phosphors change from yellow to green.

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Optical gain in Er-doped SiO2–TiO2 waveguides fabricated by the sol–gel technique

Optics Communications ◽

10.1016/s0030-4018(99)00171-6 ◽

1999 ◽

Vol 164 (1-3) ◽

pp. 19-25 ◽

Cited By ~ 53

Author(s):

E.M Yeatman ◽

M.M Ahmad ◽

O McCarthy ◽

A Vannucci ◽

P Gastaldo ◽

...

Keyword(s):

Sol Gel ◽

Optical Gain ◽

Gel Technique ◽

Er Doped

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Structural Modification of Sol-Gel Synthesized V2O5and TiO2Thin Films with/without Erbium Doping

Advances in Materials Science and Engineering ◽

10.1155/2014/795384 ◽

2014 ◽

Vol 2014 ◽

pp. 1-8 ◽

Cited By ~ 3

Author(s):

Fatma Pınar Gökdemir ◽

Ayşe Evrim Saatci ◽

Orhan Özdemir ◽

Kubilay Kutlu

Keyword(s):

Structural Modification ◽

Sol Gel ◽

Blue Shift ◽

Granule Size ◽

Absorption Measurement ◽

Erbium Doping ◽

Er Doping ◽

Fourier Transform Ir ◽

Gel Technique ◽

Er Doped

Comparative work of with/without erbium- (Er-) doped vanadium pentoxide (V2O5) and titanium dioxide (TiO2) thin films were carried out via sol-gel technique by dissolving erbium (III) nitrate pentahydrate (Er(NO3)3·5H2O) in vanadium (V) oxoisopropoxide (OV[OCH(CH3)2]3) and titanium (IV) isopropoxide (Ti[OCH(CH3)2]4). Effect of Er doping was traced by Fourier transform IR (FTIR), thermogravimetric/differential thermal (TG/DTA), and photoluminescence measurements. UV-Vis transmission/absorption measurement indicated a blue shift upon Er doping in V2O5film due to the softening of V=O bond while appearance of typical absorption peaks in Er-doped TiO2film. Granule size of the films increased (reduced) upon Er substitution on host material compared to undoped V2O5and TiO2films, respectively.

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