Absorption and luminescence studies of Sm3+ ions activated in distinct phosphate glasses for reddish orange light applications

Characterization of Flux-Grown SmxNd1–xVO4 Compounds and High-Pressure Behavior for x = 0.5

“…For NdVO 4 , the bands around 3.5 eV (∼27800 cm –1 ) and 2.9 eV (∼27800 cm –1 ) have been assigned to the 4 I 9/2 → 4 G 11/2 and 4 I 9/2 → 4 G 9/2 transitions. , Upon addition of Sm 3+ ( x = 0.1), a prominent absorption band emerges near 3.04 eV (24570 cm –1 ), corresponding to 6 H 5/2 → ( 6 P 4 P) 5/2 . As expected, Nd 3+ intensities gradually weaken upon increasing Sm 3+ content, while several discrete Sm 3+ bands gain in intensity: 6 H 5/2 → 4 M 7/2 at 2.93 eV (23 600 cm –1 ), 6 H 5/2 → 6 P 3/2 at 3.15 eV (25 400 cm –1 ), , 6 H 5/2 → 6 P 7/2 at 3.26 eV (26 300 cm –1 ), 6 H 5/2 → 4 D 3/2 at 3.38 eV (27 300 cm –1 ) , and 6 H 5/2 → 4 F 9/2 at 3.47 eV (27 800 cm –1 ) . Finally, the peak around 3.55 eV (28 600 cm –1 ) is assigned to 6 H 5/2 → 4 K 15/2 …”

Bridgman Growth and Photoelectronic Property of Relaxor-Based Ferroelectric Single Crystal Pb(Sm1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3

“…The luminescent properties of (a), (b), and (c) crystal wafers were characterized by the emission spectra and excitation spectra shown in Figure 8. Under 408 nm photonic excitation, the emission spectra in Figure 8a present the four intense emission peaks located at 562, 598, 644, and 705 nm, which were attributed to the doped Sm 3+ ions with the characteristic energy level transitions of 4 [29]. Using the strongest emission at 598 nm as the monitor mode, the excitation spectra in Figure 8b exhibit a series of spectral lines in the 300~500 nm region, corresponding to the energy level transitions of 6 [26][27][28].…”

Influence of barium substitution on the physical, thermal, optical and luminescence properties of Sm3+-doped metaphosphate glasses for reddish orange light applications

“…Hence, the decrease in lifetime with increasing concentration can be primarily attributed to cross-relaxation energy transfer processes such as ( 4 G 5/2 ; 6 H 5/2 ) → ( 6 F 11/2 ; 6 F 5/2 ) and ( 4 G 5/2 ; 6 H 5/2 ) → ( 6 F 9/2 ; 6 F 7/2 ). 18,48 The values of radiative lifetime decrease from 2.98 to 2.93 for 20BaSm0.3 and 40BaSm0.3 glass respectively. It is clear that the 4 G 5/2 level's radiative lifetime was continuously longer than the observed lifetime, which gets smaller as Sm 3+ concentration rises.…”

“…Conversely, the glass's lasing efficiency is evaluated using the spectroscopic quality factor ( χ ), which is defined as the ratio of Ω 4 to Ω 6 . 18 A smaller Ω 4 / Ω 6 ratio indicates a more intense laser transition from the 4 G 5/2 state to the 6 H 7/2 state. The spectroscopic quality factor ( χ ) value for our glasses was found to be approximately 1.16, which is the smallest compared to the other glasses mentioned in Table 4 .…”

“…Recently, Naick et al investigated the optical absorption spectra of trivalent samarium ions doped phosphate glasses with Li 2 O, MgO, CaO, SrO and BaO as modifiers for visible orange-red photonic domains. 18 Several researchers have explored different optical absorption analysis of phosphate and sulfophosphate glasses doped with Sm 3+ ions. 19 It has been observed that within these glass matrices, there is a conversion of oxygen atoms from bridging to non-bridging positions.…”