Effects of halides on luminescence behaviors of Ce3+ ions in chalcohalide glasses

Highly efficient near-infrared quantum cutting in Ce3+/Yb3+ co-doped chalcohalide glasses

“…] transition of Ce 3+ ion from 5d excited state to 2F ground state, which is a parity allowed electric dipole (e-d) transition with large oscillator strength [9,10]. Compared to the single doped samples, the codoped sample shows very strong NIR emissions centered at ~ 980 nm-1020 nm due to the 2 F 5/2 → 2 F 7/2 transitions of Yb 3+ [5][6][7], but the visible emission is much reduced, implying that there exists an efficient ET from Ce 3+ to Yb 3+ .…”

“…The absorption of Ce 3+ originates from the allowed electric-dipole transition from the 4f ground state to the 5d excited one, which results in a very high absorption cross section on the order of 10 -18 cm 2 [8]. Our previous work has shown that upon the blue (450 nm) excitation Ce 3+ doped chalcohalide glasses emit 520 nm (~2.4 eV) photons [9,10], which are exactly two times of the Yb 3+ : 2 F 5/2 → 2 F 7/2 transition. Moreover, chalcohalide glasses have been demonstrated to be good candidate for hosting RE 3+ to obtain high ET efficiency and QY because of their low phonon energy (~350 cm -1 ) [11].…”