Indian Journal of Science and Technology

Open Access Open Access  Restricted Access Subscription Access

Luminescence Studies of Eu3+ Doped BaGd2O4 Phosphor


Affiliations
1 Department of Physics, Osmania University, Hyderabad-500 007, India
 

The spectroscopic properties of BaGd2-xO4:Eux (x = 0.0 - 0.1) phosphors were investigated. The phosphors were synthesized by conventional solid state reaction method. The samples were characterized by powder-XRD and energy dispersive spectroscopy (EDS) techniques. The photoluminescence (PL) and thermally stimulated luminescence (TSL) studies of these materials were investigated. For PL studies the samples were excited with 258 nm UV light. All the samples showed strong red emission at 611 nm due to 5D0→7F2 electric dipole transition of Eu3+ ions. PL peak intensity was found to increase with increase in the dopant concentration. For TSL studies, samples were γ-irradiated with different dose rates using 60Co source. TSL of these phosphors showed a sharp glow peak with maxima at 394 K. Incorporation of europium activator in BaGd2O4 phosphor resulted in the increase of peak intensity. The trap parameters viz., order of kinetics (b), activation energy (E) and frequency factor (S) associated with the most intensive glow peak of BaGd2O4:Eu3+ phosphor were determined using glow curve shape (Chen's) method. These phosphors can be useful in TL dosimetry.

Keywords

Phosphors, Photoluminescence, U.V Excitation, Thermoluminescence, Dosimetry
User

  • Kang CC and Liu RS (2007) The effect of terbium concentration on the luminescent properties of yttrium oxysulfide phosphor for FED application, J. Lumin. pp: 122–123, pp: 574–576.

  • Ko MG, Park JC, Kim DK and Byeon SH (2003) Lowvoltage cathodoluminescence property of Li-doped Gd2_xYxO3 : Eu3+. J. Lumin. 104, 215–221.

  • Lai Hh, Chen Bj, Xu W, Xie Yh, Wang Xj and Di WH (2006) Fine particles (Y,Gd)PxV1-xO4 : Eu3+ phosphor for PDP prepared by co-precipitation reaction, Mater. Lett. 60, 1341–1343.

  • Jung HK and Seo KS (2006) Luminescent properties of Eu2+-activated (Ba, Sr)3MgSi2O8 phosphor under VUV irradiation, Opt. Mater. 28, 602–605.

  • Hsu WT, Wu WH and Lu CH (2003) Synthesis and luminescent properties of nano-sized Y3Al5O12 : Eu3+ phosphors, Mater. Sci. Engg. B104, 40–44.

  • Jean-Charles Souriau, Yong Dong Jiang, John Penczek, Henry Paris G and Christopher Summers J (2000) Cathodoluminescent properties of coated SrGa2S4:Eu2+ and ZnS:Ag,Cl phosphors for field emission display applications Mater. Sci. Engg. B76, 165-168.

  • Nemec P and Maly P (2000) Temperature study of trap-related photoluminescence decay in CdSxSe1-x nanocrystals in glass, J. Appl. Phys. 87, 3342.

  • Bol AA and Meijerink A (2000) Doped semiconductor nanoparticles - a new class of luminescent materials? J. Lumin. 87, 315-318.

  • Yoshihiro D, Wataru N and Yukio H (2006) Crystal structures and magnetic properties of magnetically frustrated systems BaLn2O4 and Ba3Ln4O9 (Ln = lanthanide), J. Phys. Condens. Matter. 18, 333–344.

  • Manivannan V, Comanzo HA, Setlur AA, Srivastava AM, Schmidt PA and Happek U (2003) Nature of luminescent centers in Cerium activated materials with the CaFe2O4 structure, J. Lumin. pp: 102–103, pp: 635–637.

  • Brixner LH (1967) Fluorescence and Cathodoluminescence of Eu3+ in Some alkali and alkaline earths-yttrates and gadolinates as hosts. J. Electrochem. Soc. Solid State Sci. 114, 252–254. JCPDS No. 42-1496.

  • Kubota S, Suzuyama Y, Yamane H and Shimada M (1998) Luminescence properties of LiSr2Y1-xLnxO4 (Ln=Eu,Tb,Tm) (0=x=1) J. Alloys Compd. 268, 66-71.

  • Blasse G and Brill A (1967) Fluorescence of Eu3+- Activated Lanthanide Oxyhalides J. Chem. Phys. 46, 2579-2582.

  • Pires AM, Santos MF, Davolos MR and Stucchi EB (2002) The effect of Eu3+ ion doping concentration in Gd2O3 fine spherical particles. J. Alloys Compd. 344, 276-279.

  • Shionoya S and Yen WM (1999) Phosphor handbook CRC Press, Boca raton. pp: 190.

  • Taibi M, Aride J, Antic-Fidancev E and Lemaitre- Blaise M (1994) Etude de la fluorescence de Eu3+ dans BaRE2O4 (RE = Gd, Y). Détermination des paramètres du champ cristallin. Phys. Status Solid. A144, 453-459.

  • LIDE D (2002) Editor in chief, the CRC handbook of Chemistry and Phys. On CD-ROM, CRC Press, Version. 22.

  • Chuai XH, Zhang HJ, Sh Li F, Sh Z Lu, J Lin, Sh B Wang and Chou KC (2002) Synthesis and luminescence properties of oxyapatite NaY9Si6O26 doped with Eu3+, Tb3+, Dy3+ and Pb2+. J.Alloys Compd. 334, 211-218.

  • Chen R and Mc Keever SWS (1997) Theory of thermoluminescence and related phenomenon. World Scientific Singapore. pp: 29.


Abstract Views: 530

PDF Views: 137




  • Luminescence Studies of Eu3+ Doped BaGd2O4 Phosphor

Abstract Views: 530  |  PDF Views: 137

Authors

M. Srinivas
Department of Physics, Osmania University, Hyderabad-500 007, India
B. Appa Rao
Department of Physics, Osmania University, Hyderabad-500 007, India

Abstract


The spectroscopic properties of BaGd2-xO4:Eux (x = 0.0 - 0.1) phosphors were investigated. The phosphors were synthesized by conventional solid state reaction method. The samples were characterized by powder-XRD and energy dispersive spectroscopy (EDS) techniques. The photoluminescence (PL) and thermally stimulated luminescence (TSL) studies of these materials were investigated. For PL studies the samples were excited with 258 nm UV light. All the samples showed strong red emission at 611 nm due to 5D0→7F2 electric dipole transition of Eu3+ ions. PL peak intensity was found to increase with increase in the dopant concentration. For TSL studies, samples were γ-irradiated with different dose rates using 60Co source. TSL of these phosphors showed a sharp glow peak with maxima at 394 K. Incorporation of europium activator in BaGd2O4 phosphor resulted in the increase of peak intensity. The trap parameters viz., order of kinetics (b), activation energy (E) and frequency factor (S) associated with the most intensive glow peak of BaGd2O4:Eu3+ phosphor were determined using glow curve shape (Chen's) method. These phosphors can be useful in TL dosimetry.

Keywords


Phosphors, Photoluminescence, U.V Excitation, Thermoluminescence, Dosimetry

References





DOI: https://doi.org/10.17485/ijst%2F2012%2Fv5i7%2F30505