Upconversion photoluminescence properties of Er3+-doped BaxSr1−xTiO3 powders with different phase structure

Enhanced ferro-/piezoelectric properties of tape-casting-derived Er3+-doped Ba0.85Ca0.15Ti0.9Zr0.1O3 optoelectronic thick films

“…Similar to other Er 3+ -doped BT-based materials [28,33], there are three emission bands, i.e., two strong green emission bands centered at 525 and 550 nm associated with 2 H 11/2 / 4 S 3/2 → 4 I 15/2 , and one weak red emission band of 660 nm corresponding to 4 F 9/2 → 4 I 15/2 transition from Er 3+ . The Stark splitting of the 4f energy-levels of Er 3+ occurs under crystal field due to the interaction between Er 3+ and the BCTZ host [34], leading to a remarkable split of three or four peaks for each emission band. All the specimens show similar PL spectral shapes.…”

Boosting Upconversion Photoluminescence and Multielectrical Properties via Er-Doping-Modulated Vacancy Control in Ba0.85Ca0.15Ti0.9Zr0.1O3

“…The upconversion PL emission spectra (Figure 7a) manifest that under the excitation of 980 nm there are two strong green emission bands and one weak red emission band locating at ∼522, 550, and 667 nm, resulting from the 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 , and 4 F 9/2 → 4 I 15/2 transitions of Er 3+ , respectively. A clear splitting of emission peaks can be observed, ascribed to the Stark splitting of the degenerate 4f levels of Er 3+ under strong crystal field, 34 which is affected by the interaction between Er 3+ and the BCTZ host. The PL intensities of BCTZ-Er- y ( y = Ba, Ca) are weaker than those of BCTZ-Er- y ( y = Ti, Zr).…”

Enhanced visible and mid-IR emissions in Er/Yb-codoped K0.5Na0.5NbO3 ferroelectric ceramics

“…In addition, the n values for the red emissions decrease significantly with the codoping of Yb 3+ , suggesting that a mixing one-and two-photon process involves in which one-photon process is dominant [24]. The mechanism of up-conversion red emissions will be further discussed later.…”