<trans-title xml:lang="en">Broadband 3 μm Mid-infrared Emission in Dy<sup>3+</sup>/Yb<sup>3+</sup> Co-doped Tellurite Glass under 980 nm LD Excitation </trans-title>

11. Spectral overlap of Yb³⁺: ²F_5/2→²F_7/2 emission cross-section, emission sidebands, and various absorption cross-sections of Dy³⁺ in TZL-Dy/Yb sample

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Table 1. Nominal and actual composition of TZL-Dy/Yb sample
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Table 1. Nominal and actual composition of TZL-Dy/Yb sample
Component element Mass percentage/% Test percentage/%
Te 70.80 70
Zn 12.80 13
La 11.00 11
Dy 2.64 3
Yb 2.76 3

Table 2. J-O intensities, parameters Ω_t (t=2, 4, 6) of Dy³⁺ in various glasses
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Table 2. J-O intensities, parameters Ω_t (t=2, 4, 6) of Dy³⁺ in various glasses
Glass Ω_t/(×10^-20, cm²) Ω₄/Ω₆ Ref.
Ω₂ Ω₄ Ω₆
80(0.8GeS₂·0.2Ga₂S₃)·20CdI₂ 14.26 1.10 2.73 0.40 [21]
ZBLAY 3.16 1.67 2.45 0.68 [9]
LiYF₄ crystal 2.01 1.34 2.39 0.56 [20]
70TeO₂-25ZnO-5La₂O₃ 3.54 0.76 1.10 0.69 This work

Table 3. Radiative spectral parameters of Dy³⁺ ions in TZL-Dy sample
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Table 3. Radiative spectral parameters of Dy³⁺ ions in TZL-Dy sample
Transition A/s^-1 β/% τ/ms
⁶H_13/2→⁶H_15/2 51.44 100 19.44
⁶H_11/2→⁶H_13/2 14.77 12 -
→⁶H_15/2 110.22 88 8.00
⁶H_9/2→⁶H_11/2 6.20 6 -
→⁶H_13/2 31.31 30 -
→⁶H_15/2 65.59 64 9.70

Table 4. Energy transfer micro-coefficient, critical radius, phonon number and contribution ratio in energy transfers between Yb³⁺ and Dy³⁺ ions

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Table 4. Energy transfer micro-coefficient, critical radius, phonon number and contribution ratio in energy transfers between Yb³⁺ and Dy³⁺ ions

Energy transfer	Phonon number (N), contribution ratio/%				C_D-A/(×10^-40, cm⁶·s^-1)	R_C/nm
Energy transfer	0	1	2	3	C_D-A/(×10^-40, cm⁶·s^-1)	R_C/nm
ET1 (Yb³⁺: ²F_5/2→Dy³⁺: ⁶F_7/2)	99.92	0.08	0	0	0.82	0.700
ET2 (Yb³⁺: ²F_5/2→Dy³⁺: ⁶H_7/2, ⁶F_9/2)	11.49	85.50	3.01	0	9.36	1.050
ET3 (Yb³⁺: ²F_5/2→Dy³⁺: ⁶H_9/2, ⁶F_11/2)	0	0	55.61	44.39	1.35	0.760

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Yuzhou PAN, Fajian HE, Lulu XU, Shixun DAI. Broadband 3 μm Mid-infrared Emission in Dy³⁺/Yb³⁺ Co-doped Tellurite Glass under 980 nm LD Excitation [J]. Journal of Inorganic Materials, 2025, 40(5): 521

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