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By partially substituting Ga3+ ions at Al1(2a) and Al2/Si1(4e) sites in gehlenite Ca2Al2SiO7, novel Ca2GaAlSiO7:Eu2+/Ce3+ phosphors with efficient green and blue emissions have been prepared for the first time. Structure and luminescence properties of these newly obtained samples have been investigated in detail together with the effect of Ga3+ substitution which has caused a decrement of Eu–O bond length and covalency. The excitation spectra suggested that both the Eu2+ and Ce3+ doped Ca2GaAlSiO7 samples had broad excitation bands in the UV range, which are favourable properties for application as UV-WLED phosphors. Under 350 nm irradiation, the Ca2GaAlSiO7:Eu2+ had intense emission peaking at 510 nm, while Ca2GaAlSiO7:Ce3+ emitted bright blue light. The energy migration mechanism of the Eu2+ ions was confirmed to be electric dipole–dipole interaction in terms of the experimental results and analysis. The thermal quenching mechanism, and quantum efficiency of the composition-optimized samples have been investigated. Moreover, a white LED device has been obtained by coating our prepared phosphors with CaAlSiN3 red phosphor on a UV chip. The experimental results suggested that the Ca2GaAlSiO7:Eu2+ and Ca2GaAlSiO7:Ce3+ samples might have potential value in serving as green and blue phosphors for UV-WLEDs, respectively.

rsc advances

Cation substitution induced novel gehlenite Ca2GaAlSiO7:Eu2+/Ce3+phosphor with green/blue emission for UV-WLEDs