Optical properties of rare-earth doped epitaxial Sr0.5Ba0.5Nb2O6 thin films grown by pulsed laser deposition |
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Authors: | YB Yao CL Mak KH Wong KW Cheah |
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Affiliation: | a Department of Applied Physics, The Hong Kong Polytechnic University, Hong Hum, Kowloon, Hong Kong, Chinab Department of Physics, Hong Kong Baptist University, 224 Waterloo Rd., Kowloon Tong, Kowloon, Hong Kong, China |
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Abstract: | Optical quality rare-earth (RE) (Nd3+, Eu3+, Gd3+ and Yb3+) doped Sr0.5Ba0.5Nb2O6 (SBN) epitaxial films of ~ 170 nm thick have been successfully grown on MgO (100) single crystal substrates using pulsed laser deposition technique. Strong residual stress in these films has been revealed by Raman spectroscopic studies. Two kinds of in-plane orientations with respect to the MgO substrate co-exist. All the film samples show high transparency in the visible wavelength. Their band-gap energies appear to be independent of the types of dopant. Photoluminescence (PL) spectra of RE-doped SBN ceramics show a strong and broad emission band at around 600 nm (2.07 eV). The peak position of this emission band changes slightly with different RE-dopants. Thin film samples, however, yield a broad PL band at around 385 nm (3.22 eV). This UV emission shows no observable shift in the peak position for different dopants. Apart from these broad emission bands, conspicuous emission lines from Eu3+ and Nd3+ ions are also noted. The origins of these PL spectra are discussed. |
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Keywords: | Strontium Barium Niobiate Epitaxial film Rare-earth doping Photoluminescence Raman spectroscopy |
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