Sintering and Optical Property of Nd3+:Lu2O3 Fabricated by Spark Plasma Sintering

doi:10.15541/jim20170110

Abstract

Abstract:

Lu₂O₃ is a novel material for high-power solid-state lasers due to its high thermal conductivity. In present work, Nd³⁺:Lu₂O₃ transparent ceramics with different Nd³⁺ doping concentration (C_Nd = 0, 1at%, 3at% and 5at%) were fabricated by spark plasma sintering, using commercial oxides as raw materials and LiF as sintering aid. The effect of Nd³⁺ doping concentration on phase, sintering property, microstructure and optical properties was investigated. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), UV-VIS-NIR spectroscopy, and fluorescence spectroscopy were used for characterization. The results show that the sintered body exhibits pure Lu₂O₃ phase even with high Nd³⁺ doping concentration (5at%). The Nd³⁺ doping concentration has little influence on densification behavior and microstructure of Nd³⁺:Lu₂O₃ ceramics. All the sintered bodies have a high relative density above 99.5% and excellent transparency, in which 3at% Nd³⁺:Lu₂O₃ body shows highest transmittance, with values of 82.7% and 83.2% at 1064 and 2000 nm, respectively. Nd³⁺:Lu₂O₃ transparent ceramics show strongest emission bands located at 1076 and 1080 nm, which are attributed to the ⁴F_3/2→⁴I_11/2 transition of Nd³⁺ ions. The emission intensity and decay time decrease with increasing Nd³⁺ doping concentration, which indicates concentration quenching.

Key words: spark plasma sintering, Nd³⁺:Lu₂O₃, Nd³⁺ doping concentration

CLC Number:

TQ174

AN Li-Qiong, ZHANG Jian, FAN Run-Hua, GOTO Takashi, WANG Shi-Wei. Sintering and Optical Property of Nd³⁺:Lu₂O₃ Fabricated by Spark Plasma Sintering[J]. Journal of Inorganic Materials, 2017, 32(12): 1315-1320.

Figures/Tables 9

Fig. 1 Sintering profile of Nd3+:Lu2O3 transparent ceramics produced by spark plasma sintering

Fig. 2 (a) Typical XRD pattern of the 5at% Nd3+:Lu2O3 transparent ceramic and (b) lattice parameters of Lu2O3 transparent ceramics with different Nd3+ doping concentration Inset in (a) shows the fine XRD patterns of Lu2O3 transparent ceramics with different Nd3+ doping concentrations in the 2θ range of 77°-80°

Fig. 3 Relative density of Lu2O3 transparent ceramics with different Nd3+ doping concentrations

Fig. 4 SEM images of thermally etched (a) and fracture (b) surfaces of the 5at% Nd3+:Lu2O3 transparent ceramic

Fig. 5 Photographs of Lu2O3 transparent ceramics with different Nd3+ doping concentrations before and after annealing

Fig. 6 (a) Transmittance spectra of the 5 at%Nd3+:Lu2O3 transparent ceramics before and after annealing and (b) transmittance at representative wavelengths (1064 and 2000 nm) for Nd3+:Lu2O3 transparent ceramics with different doping concentrations before (red) and after annealing (dark) The dot line refers to theoretical transmission of Lu2O3 calculated from ref[19]

Fig. 7 (a) Absorption coefficient spectra of Lu2O3 transparent ceramics with different Nd3+ doping concentration after annealing and (b) absorption coefficient at 806 nm for the Lu2O3 transparent ceramics with different Nd3+ doping concentrations before and after annealing

Fig. 8 Emission spectra of Lu2O3 transparent ceramics with different Nd3+ doping concentration irradiated by an 808 nm diode laser at room temperature

Fig. 9 Fluorescence lifetime of Lu2O3 transparent ceramics with different Nd3+ doping concentration and the fitted curve (solid line)

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Sintering and Optical Property of Nd³⁺:Lu₂O₃ Fabricated by Spark Plasma Sintering

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