Contrasting behaviour of the co-activators in the luminescence spectra of Y2O2S:Tb3+,Er3+ nanometre sized particles under UV and red light excitation

DOI: 10.1039/C2NR33391K, Paper

Upconversion luminescence (black line) is observed from the Er³⁺ ions of Y₂ O₂ S:Tb³⁺ ,Er³⁺ nanoparticles under red laser excitation, whereas downconversion luminescence (red line) is observed from both Tb³⁺ and Er³⁺ ions under 254 nm excitation.

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