Spectroscopic and photoluminescence characterization of Eu3+-doped monoclinic KY(WO4)2 crystal

Abstract

a b s t r a c tMonoclinic 2 at% Eu-doped KY(WO 4 ) 2 is grown by top-seeded solution growth method. Polarizationresolved absorption and stimulated-emission cross-section spectra are determined for this crystal. Spectroscopic properties of Eu:KY(WO 4 ) 2 are modeled within conventional Judd-Ofelt theory, as well as theory of f-f transition intensities for systems with anomalously strong configuration interaction, yielding absorption oscillator strengths, luminescence branching ratios and radiative lifetime of 5 D 0 state. The impact of excited-state absorption from this state on possibility of laser operation is discussed. Photoluminescent properties of Eu:KY(WO 4 ) 2 are determined. This crystal provides intense red emission with CIE coordinates x¼0.670, y¼0.329.

Optical spectroscopy of Eu3+ ions doped in KLu(WO4)2 single crystals

“…The attribution of the different bands ( figure 2) is similar to that presented in our previous article with some modification [1]. Indeed, we have reexamined the absorption spectra attribution basing on recently published articles for Eudoped in KY(WO 4 ) 2 [16], KGd(WO 4 ) 2 crystal [17] and Y 3 Ga 5 O 12 [18].…”

Transparent glass–ceramics with (Eu3+,Yb3+):YNbO4 nanocrystals: Crystallization, structure, optical spectroscopy and cooperative upconversion

“…The absorption spectrum is due to Eu 3+ ions except a broad and intense band at 850-1050 nm, which is due to Yb 3+ ions ( 2 F 5/2 → 2 F 7/2 ). The absorption bands are assigned to electronic transitions from the 7 F 0 ground state and thermally populated lower-lying 7 F 1 excited state to different higher-lying excited states of Eu 3+ : 7 F 0,1 → 5 L 6 (~395 nm), 7 F 0 → 5 D 2 (~465 nm), 7 F 0,1 → 5 D 1 (~530 nm), 7 F 0,1 → 7 F 5 + 7 F 6 (1800-2250 nm) on the basis of earlier work [75]. In the mid-IR, a sharp peak at ~3 μm is related to the absorption of OH --groups.…”

The crystal structure and luminescence quenching of poly- and single-crystalline KYW2O8:Tb3+

“…The family of monoclinic double tungstates is widely investigated as a host material for solid state laser gain materials [1,2] and as a radiation converter for solid state light sources [3]. This interest is driven by the observation that tungstates are rather stable and have low phonon frequencies [4,5].…”