Luminescence Behaviors of Ce³⁺ Ions in Chalcohalide Glasses

Abstract

Luminescence behaviors of Ce3+ ions in GeS2–Ga2S3–CsCl chalcohalide glasses are reported for the first time. The dependence of Ce3+ concentration and host composition on absorption and photoluminescence spectra are investigated. Results show that these glasses exhibit broadband emission from 470 to 600 nm under a blue excitation. Luminescence intensity is enhanced with the increasing of Ce3+ ions and reaches the maximum at 0.08 mol%. The decrease of CsCl content results in the red shift of absorption cut‐off edge and emission band, and decreased luminescence intensity. The mechanism for these phenomena is discussed with the theory of optical basicity.

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].…”

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

“…the red shift of the Ce 3+ emission in comparison with the oxide or even oxynitride systems [9]. In the present work, we have further studied the effects of different halides on the Ce 3+ luminescence behaviors in the Ge-Ga-S chalcogenide glasses by means of absorption and photoluminescence spectroscopy.…”

“…As 5d orbital is in the condition of non-shield, the electronic transition between this energy gap of Ce 3+ ions is strongly dependent on ligand field strength, and hence, luminescence may occur over a very broad spectral range [8]. Besides, Ce 3+ ion has a larger Stokes shift than other RE ions due to the extended radial wave functions of the 5d state [9]. For instance, high crystal field splitting or strongly covalent environments can decrease the energy of the down-converted photons, thus shifting the Ce 3+ ion emission to the longer wavelength [10].…”

“…Recently there is a remarkable growth of research in rare-earth (RE) doped luminescent materials because of their unique optical properties for potential applications such as fluorescent lamps, solid-state lasers, flat panel display and so on [1][2][3][4][5][6][7][8][9]. Luminescence of these RE ions result from the electronic transitions occurring within the partially filled 4f energy shell of the lanthanide series [1] where the Ce 3+ ion with a 4f 1 configuration shows a specific 4f-5d transition.…”