Fabrication and Luminescence Properties of Polycrystalline Ce, Pr Co-doped LSO Thin Films by Sol-Gel Method

doi:10.15541/jim20150500

Abstract

Abstract:

Lutetium oxyorthosilicate (Lu₂SiO₅, LSO) films co-doped with Ce³⁺ and Pr³⁺ was synthesized on cleaned silicon (111) substrates by Sol-Gel route with a spin-coating technique. XRD patterns indicated that the films were crystallized into A-type Lu₂SiO₅ phase at 1000℃, followed by a phase transition to B-type Lu₂SiO₅ at 1100℃. SEM observations revealed that the surface of the films was smooth, homogeneous and crack-free when the samples were calcined under 1100℃. The average grain size of the crystal particles was 200-300 nm and the thickness of the thin film was about 320 nm when the coating layer number up to 10. The energy transference from Pr³⁺ to Ce³⁺ in Lu₂SiO₅ host was observed and discussed. The luminescence intensity of Ce³⁺ can be improved after Pr³⁺ co-doping.

Key words: Sol-Gel, Lu2SiO5 films, luminescence, spin-coating method, Ce3+, Pr3+ co-doping

CLC Number:

TQ174

ZHANG Xiao-Xin, XIE Jian-Jun, FANG Ling-Cong, LIN De-Bao, CHEN Xu, SHI Ying. Fabrication and Luminescence Properties of Polycrystalline Ce, Pr Co-doped LSO Thin Films by Sol-Gel Method[J]. Journal of Inorganic Materials, 2016, 31(6): 647-651.

Figures/Tables 8

Fig. 1 XRD patterns of the LSO films calcined of different temperatures for 2 h

Fig. 2 SEM images of cross-section (a) and surface (b) morphology of the film

Fig. 3 Quenching concentration of rare earth ions. (a) Ce3+, λex=358 nm; (b) Pr3+, λex=250 nm

Fig. 4 Photoluminescence spectra of the LSO films with single rare earth ions. (a) Ce:LSO film; (b) Pr:LSO film

Table 1 Excitation and emission wavelengths of LSO film with single rare earth ions doped with Ce3+ or Pr3+

	Ex-wavelength/nm			Em-wavelength/nm
Ce³⁺ doping	265	298	358	400	422
Pr³⁺ doping	250			280	320

Fig. 5 Emission spectra of LSO films co-doped with Ce3+ (0.2mol%) and Pr3+ (0.4mol%)

Fig. 6 Comparison chart of Ce3+ emission intensities when Ce3+ single doped and co-doped with Pr3+

Fig. 7 Schematic diagram of the energy transmission co-doped with Ce3+ and Pr3+ in LSO thin films and two possible energy transfer ways from Pr3+ to Ce3+

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