Influence of Ce3+ Ions on the Near Infrared Emission of Eu2+-doped Ca3Sc2Si3O12

Authors V.P. Dotsenko1 , I.V. Berezovskaya1 , I.V. Zatovsky2, S.S. Smola1, N.P. Efryushina1

1 A.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine, 86, Lustdorfskaya Doroga, 65080 Odessa, Ukraine

2 Taras Shevchenko National University, 64/13, Volodymyrska Str., 01601 Kyiv, Ukraine

Issue Volume 7, Year 2015, Number 2
Dates Received 26 March 2015; published online 10 June 2015
Citation V.P. Dotsenko, I.V. Berezovskaya, I.V. Zatovsky, et al., J. Nano- Electron. Phys. 7 No 2, 02041 (2015)
PACS Number(s) 78.55.Hx
Keywords Phosphors (2) , Luminescence (24) , Eu2+, Energy transfer.
Annotation The luminescence properties of double-doped with Eu2 + and Ce3 + ions Ca3Sc2Si3O12 have been studied for the first time. The Eu2 + ions in Ca3Sc2Si3O12 exhibit a NIR emission with a maximum at about 840 nm, which is located in the highest spectral response region of c-Si photovoltaic solar cells. Upon the introduction of Ce3 + ions into the lattice the Ce3 + 4f → 5d band at 445 nm appears in the excitation spectra for the Eu2 + NIR emission, indicating to the presence of energy transfer between Ce3 + and Eu2 + ions. The co-doping with Ce3 + ions is also followed by local distortions of the Eu2 + environment and inhomogeneous broadening of the Eu2 +-related spectral bands. It was found that the relative intensity of the higher-energy Eu2+ 4f7 → 4f65d excitation band at 360 nm decreases with the increase of Ce3 + concentration. This unusual observation is ascribed to photoionization of Eu2 + ions, electron trapping on defects and subsequent non-radiative relaxation.

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