Figure 4.

Room-temperature PL spectra and decay curves of Er³⁺ion. (a) Room-temperature PL spectra of Er³⁺ ion in the SROEr films. (b) Decay curves of PL signal recorded at 1,540 nm for Er³⁺ in SROEr films with Si excesses of 11% and 88%. Optimized Si NCs with separated microstructures are requested to obtain efficient Er³⁺ luminescence.