Structural, photoluminescent, and dielectric properties of Eu3+-doped Ba0.7Sr0.3TiO3 thin films

다국어 초록 (Multilingual Abstract)

Eu3+-doped Ba0.7Sr0.3TiO3 thin films were prepared by a chemical solution deposition method and characterized by X-ray diffraction, field emission scanning electron microscopy, photoluminescence and dielectric measurements. The thin films were well crystallized with a pure perovskite structure. A contraction of the unit cell was observed upon incorporation of Eu3+ ions below 2 mol%, while an expansion occurred as the Eu3+ concentration was further increased above 2 mol%, indicating that Eu3+ ions with different concentrations occupied different lattice sites. Photoluminescence spectra showed two prominent transitions of Eu3+ ions at 594 nm (5D0→7F1) and 618 nm (5D0→7F2) upon excitation at 395 nm (7F0→5L6). There existed two quenching concentrations at 2 mol% and 4 mol% due to different lattice sites of the Eu3+ ions. We also investigated the dielectric properties of the thin films. Our study suggests that Eu3+-doped Ba0.7Sr0.3TiO3 thin films have potential applications in multifunctional optoelectronic devices.

참고문헌 (Reference)

1 Q. Yang, "luminescent, and magnetic properties of Ba0.77Ca0.23TiO3:Eu ceramics" 118 : 484-, 2009

2 J. Zhang, "The origin of two quenching concentrations and unusual afterglow behaviors of Ba2SnO4:Sm3þ phosphor" 132 : 2590-, 2012

3 K. -T. Kim, "The effect of Cr doping on the microstructural and dielectric properties of Ba0.6Sr0.4TiO3 thin films" 472 : 26-, 2005

4 H. Guo, "Structural and optical properties of BaTiO3 ultrathin films" 73 : 110-, 2006

5 R. Pa˛ zik, "Structural and luminescence properties of Eu3+ doped BaxSr1-xTiO3 (BST) nanocrystalline powders prepared by different methods" 28 : 1284-, 2006

6 Y. Lin, "Structural and dielectric properties of epitaxial Ba1-xSrxTiO3films grown on LaAlO3 substrates by polymer-assisted deposition" 85 : 5007-, 2004

7 C. B. Samantaray, "Photoluminescence properties of Eu3+-doped barium strontium titanate (Ba, Sr) TiO3 ceramics" 58 : 2299-, 2004

8 R. Reshmi, "Photoluminescence of Eu3+-doped Ba0.7Sr0.3TiO3 thin film for optoelectronic application" 157 : H783-, 2010

9 F. Tchetiebou, "On the microstructure and optical properties of Ba0.5Sr0.5TiO3 films" 305 : 30-, 1997

10 T. Zhang, "Microstructure and upconversion luminescence of Yb3+ and Ho3+ co-doped BST thick films" 45 : 6819-, 2010

11 Y. Gim, "Microstructure and dielectric properties of Ba1 xSrxTiO3 films grown on LaAlO3 substrates" 77 : 1200-, 2000

12 P. C. Joshi, "Mg-doped Ba0.6Sr0.4TiO3 thin films for tunable microwave applications" 77 : 289-, 2000

13 F. A. Rabuffetti, "Local structural investigation of Eu3+-doped BaTiO3 nanocrystals" 6 : 2909-, 2014

14 R. Reshmi, "Linear and nonlinear optical properties of rare earth doped of Ba0.7Sr0.3TiO3 thin films" 96 : 433-, 2009

15 G. W. Dietz, "Leakage currents in Ba0.7Sr0.3TiO3 thin films for ultrahigh-density dynamic random access memories" 82 : 2359-, 1997

16 J. Wang, "Influence of Tm-doping on microstructure and luminescence behavior of barium strontium titanate thick films" 258 : 3283-, 2012

17 C. Jiang, "Effects of Eu substituting positions and concentrations on luminescent, dielectric, and magnetic properties of SrTiO3 ceramics" 94 : 071110-, 2009

18 J. D. Baniecki, "Dielectric relaxation of Ba0.7Sr0.3TiO3 thin films from 1 mHz to 20 GHz" 72 : 498-, 1998

19 S. -Y. Kuo, "Dependence of luminescence efficiency on dopant concentration and sintering temperature in the erbium-doped Ba0.7Sr0.3TiO3 thin films" 92 : 1868-, 2002

20 D. Bao, "Band-gap energies of solgel-derived SrTiO3 thin films" 79 : 3767-, 2001