Effects of Silicon Dioxide on Structure and Spectroscopic Properties of Neodymium Doped Calcium Aluminate Glass

doi:10.15541/jim20150189

Abstract

Abstract:

Nd³⁺-doped calcium-aluminate glasses with different contents of SiO₂were prepared by conventional melting method. The change of glasses structures were studied by Raman spectroscope. The non-bridging oxygens (NBOs) around Si⁴⁺ ions increase at higher SiO₂ content samples which are transferred from alumina tetrahedron lattices and a more polymerization Al-O network appears in glass structure due to lower NBOs content. From the absorption spectra, J-O strength parameters (Ω), spontaneous transition probabilities (A_rad), branching ratios (β), emission cross-sections (σ_e), and radiative life (τ_rad) were evaluated by Judd-Ofelt theory. Analysis on the evaluation result and fluorescence spectra reveal that the surrounding structure symmetry of Nd³⁺ ions is ameliorated and the full width at half maximum (FWHM) of emission peak at 1067 nm is narrowed, meanwhile the emission cross-sections is enlarged gradually with the SiO₂ content increasing. These results show that Nd³⁺-doped calcium aluminate glass containing low content of SiO₂ has potential applications in ultrashort-pulse laser materials.

Key words: spectroscopy, calcium aluminosilicate glass, neodymium doped, glass structure, FWHM

CLC Number:

TQ174

KANG Shuai, HE Dong-Bing, GAO Song, HUANG Fei-Fei, DING Ya-Jun, HU Li-Li. Effects of Silicon Dioxide on Structure and Spectroscopic Properties of Neodymium Doped Calcium Aluminate Glass[J]. Journal of Inorganic Materials, 2015, 30(11): 1177-1182.

Figures/Tables 9

Fig. 1 DSC curves of Nd3+-doped CA glasses with the different concentrations of SiO2

Table 1 Main physical parameters of Nd3+-doped CA glasses

Sample	S0	S2	S4	S6	S8	S10	S12
T_g/℃	809	816	810	827	823	842	848
T_x/℃	924	929	927	931	938	945	963
ΔT/℃	115	113	117	104	115	103	115
K_gl	0.175	0.174	0.179	0.161	0.179	0.162	0.186
n_d	1.6749	1.672	1.6692	1.6652	1.6619	1.6593	1.6554
ρ/(g•cm^-3)	3.33	3.34	3.33	3.31	3.32	3.29	3.29

Fig. 2 Normalized Raman spectra for Nd3+-doped CA glasses with the different concentrations of SiO2

Fig. 3 Absorption spectra of Nd3+-doped CA glass without SiO2

Fig. 4 Partial energy level diagram for Nd3+

Table 2 J-O strength parameters Ωλ(λ=2,4,6)/(×10-20, cm-2), spontaneous transition probability Arad/s-1 and branching ratios β of Nd3+ in CA glasses

Sample	Ω₂	Ω₄	Ω₆	A(⁴F_3/2→⁴I_11/2)	Β(⁴F_3/2)
S0	5.69	4.82	3.61	1361	0.46
S2	5.63	4.87	3.53	1369	0.463
S4	5.69	4.87	3.69	1387	0.464
S6	5.45	4.79	3.66	1361	0.465
S8	5.36	4.75	3.72	1364	0.467
S10	5.33	4.83	3.83	1391	0.468
S12	5.13	4.82	3.8	1372	0.468

Fig. 5 Emission cross section of Nd3+:4F3/2→4I11/2 in CA glasses

Table 3 Florescence bandwidth FWMH, radiative life τrad, peak-fluorescence wavelength λ and emission cross section σe of Nd3+ for different host glasses

Sample	S0	S2	S4	S6	S8	S10	S12	N31	Q-246	L-65
FWHM	39.70	38.80	37.90	38.00	37.10	36.50	36.30	20.10	28.50	41.23
λ/nm	1067	1067	1067	1066	1066	1066	1065	1053	1061	1067
τ_rad/μs	338	338	335	342	343	337	341	351	406	349
σ_e/(×10^-20, cm²)	1.84	1.85	1.90	1.92	1.92	2.04	2.02	3.80	2.40	1.80

Fig. 6 Normalized fluorescence spectra for Nd3+-doped CA glasses with the different content of SiO2

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