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Issue 9, 2014
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Defect to R3+ energy transfer: colour tuning of persistent luminescence in CdSiO3

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Abstract

Luminescence from trivalent rare earth (R3+: La3+–Lu3+, excluding Pm3+) ions was studied in the CdSiO3 host. The positions of the R2+/3+ energy levels in the band structure of CdSiO3 suggest that the doping of CdSiO3 with R2+ ions is difficult if not impossible. Red, pink, blue, green and close to white persistent luminescence colours were obtained by doping with Pr3+, Sm3+, Gd3+, Tb3+ and Dy3+, respectively. The efficiency of the defect to R3+ energy transfer determines if persistent luminescence arises from the 4f–4f, defect or a combination of these two emissions. In contrast to what is observed for Pr3+ and Tb3+, the defect to R3+ energy transfer did not give efficient persistent luminescence for Sm3+ and Dy3+, probably due to high energy losses and/or back transfer from the rare earth to defects. In line with the experimental observations, the in situ synchrotron radiation XANES spectra indicated the presence of only the trivalent Pr3+ and Tb3+ species thus excluding the direct R3+ → RIV oxidation during the charging process of persistent luminescence. Finally, based on the band gap energy, R2+/3+ energy level positions, trap energies, and other optical and structural properties, the mechanism of persistent luminescence was developed for Pr3+ doped CdSiO3. For practical applications, the CdSiO3:R3+ system offers an excellent possibility for colour tuning of persistent luminescence by changing only the R3+ dopant instead of altering the host as is the case with the Eu2+ doped materials. Eventually, this will avoid the waste of both intellectual and financial resources.

Graphical abstract: Defect to R3+ energy transfer: colour tuning of persistent luminescence in CdSiO3

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Publication details

The article was received on 09 Oct 2013, accepted on 23 Nov 2013 and first published on 25 Nov 2013


Article type: Paper
DOI: 10.1039/C3TC31995D
Citation: J. Mater. Chem. C, 2014,2, 1612-1618
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    Defect to R3+ energy transfer: colour tuning of persistent luminescence in CdSiO3

    L. C. V. Rodrigues, J. Hölsä, M. Lastusaari, M. C. F. C. Felinto and H. F. Brito, J. Mater. Chem. C, 2014, 2, 1612
    DOI: 10.1039/C3TC31995D

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