Effect of Network Modifier on Spontaneous Emission Probabilities of Er³⁺ in Oxide Glasses

Abstract

Compositional dependence of spontaneous emission probabilities of Er3+ was studied for silicate, borate, and phosphate glasses using the Judd-Ofelt theory. Through all of the glass systems, spontaneous emission probabilities of the 4Z, , , , + 4Z1512, 'Z9/, +-'IIJ, and 4S,,, + 'IJ (J = 9/2,11/2,1312, 1512) transitions increased with increased ionic packing ratio of the glass host, which varied markedly with the type of network modifier. The effect of Er-0 covalency on the transition probabilities was discussed from the spectral profile of the 4Z,,, +-' s , transition in terms of nephelauxetic effect.

Relationship between the local structure and spontaneous emission probability of Er3+in silicate, borate, and phosphate glasses

“…Table 1 also lists the A coef®cient. These data were cited by the previous works [11]. In silicate glasses, the A coef®-cient changes little (from 58.8 to 66.0 s 21 ) with the Na 2 O content, although it signi®cantly changes (from 66.0 to 116.9 s 21 ) with the type of alkali metal oxide.…”

Directional solidification, thermo-mechanical and optical properties of (Mg_xCa_1-x)_3Al_2Si_3O_12 glasses doped with Nd^3+ ions

“…The close relationship between JO parameters and the nature of the glass host allows tailoring, within limits, these optical properties based on the suitable choice of the glass composition. JO parameters are related to local structures in the vicinity of rare-earth ions and/or the covalency of the rare-earth-ion site [12,13,[28][29][30][36][37][38][39][40][41][42]. For instance, Ω 2 is sensitive to the local structures in the vicinity of rare-earth ions relating to the anion structures of host glasses and reflects the asymmetry around the rare-earth ions.…”

“…Therefore, Ω 2 and Ω 6 are mostly studied for local structure investigations [42]. With regards to the Ω 6 parameter, this intensity parameter is insensitive to local structures but related to the covalency of the rare-earth-ion site [13,[28][29][30][36][37][38][39][40][41]. Tanabe et al stated that Ω 6 of Nd 3+ and of Er 3+ decreased with increasing the covalency of the rare-earth-ion sites in oxide glasses [39,40].…”

“…Tanabe et al stated that Ω 6 of Nd 3+ and of Er 3+ decreased with increasing the covalency of the rare-earth-ion sites in oxide glasses [39,40]. On the contrary, Takebe et al reported that in silicate, borate and phosphate glasses Ω 6 of Nd 3+ increased and Ω 6 of Er 3+ decreased when the covalency between the rare-earth ion and the oxygen ion increased [29,30,41]. Despite the numerous works on compositional dependence of intensity parameters, the correlation between intensity parameters and glass structure has not yet been completely clarified.…”

Effect of composition on the spontaneous emission probabilities, stimulated emission cross-sections and local environment of Tm3+ in TeO2–WO3 glass

“…Spontaneous emission probability of the laser transition is an important parameter because it is directly related to the stimulated emission cross-section, radiative quantum efficiency, and fluorescence branching ratio [16]. The Judd-Ofelt theory is usually used to determine the electric dipole transition probabilities including the spontaneous decay rate by utilising the absorption cross-sections of several 4f-4f transitions [17,18].…”