Calculation of Judd-Ofelt Parameters for Lu2O3:Er3+ Phosphor

doi:10.15541/jim20180212

Abstract

Abstract:

Optical transition properties of trivalent rare earth ions in transparent luminescent materials can be investigated via Judd-Ofelt analysis. The traditional Judd-Ofelt analysis can not be applied to nontransparent powders since its absorption spectra are unable to be measured. Therefore, in this study, a procedure for calculating the Judd-Ofelt parameters was proposed by using defuse-reflection spectrum. Firstly, the defuse-reflection spectrum was transformed into relative absorption spectrum based on Kubelka-Munk function, and then the relative Judd- Ofelt parameters were confirmed from the relative absorption spectrum, at last the actual Judd-Ofelt parameters were obtained by using fluorescence decay data for calibrating the relative values. The method proposed for Judd-Ofelt parameters’ calculation was applied to Lu₂O₃:Er³⁺ phosphor prepared by solid-state reaction, and the method was confirmed. The obtained Judd-Ofelt parameters were examined by comparing the radiative transition rates of ⁴I_13/2 derived from the absorption cross section with which obtained from usual route by using the Judd-Ofelt parameters. The present study demonstrated that the proposed Judd-Ofelt analysis route is reliable and practical.

Key words: Judd-Ofelt theory, Kubelka-Munk equation, optical transition, fluorescence decay

CLC Number:

TQ174

YU Chun-Feng, ZHANG Xiang-Qing, HAN Wen-Yan, ZHANG Jin-Su, LI Xiang-Ping, XU Sai, CHEN Bao-Jiu. Calculation of Judd-Ofelt Parameters for Lu₂O₃:Er³⁺ Phosphor[J]. Journal of Inorganic Materials, 2019, 34(2): 213-218.

Figures/Tables 6

Fig. 1 XRD patterns of Lu2O3: 1.0mol% Er3+ and Lu2O3 standard card JCPDS 86-2475

Fig. 2 FE-SEM images of Lu2O3: 1.0mol% Er3+ phosphor

Fig. 3 Defuse-reflection (a) and relative absorption (b) spectra of Lu2O3:Er3+

Table 1 Relative experimental oscillator strengths, relative theoretical oscillator strengths for some transitions of Er3+ in Lu2O3 and relative J-O parameters

Energy level	Relative experimental oscillator strengths, ×10^-8	Relative theoretical oscillator strengths, ×10^-8
⁴I_11/2	6.16	7.01
⁴I_9/2	5.03	10.00
⁴F_9/2	23.02	51.18
⁴S_3/2	4.61	5.43
²H_11/2	86.53	119.96
⁴F_7/2	8.42	31.91
⁴F_5/2,⁴F_3/2	0.96	10.27
²H_9/2	0.58	9.97
⁴G_11/2	53.73	210.69
Error: =14.3 Relative J-O parameters: Ω °₂=4.43´10^-21; Ω °₄=3.85´10^-21; Ω °₆=1.03´10^-21

Fig. 4 Fluorescent decay curve of 4I13/2 level of Er3+ in Lu2O3 powder

Fig. 5 Absorption cross section of Lu2O3:Er3+ phosphor

References 21

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Calculation of Judd-Ofelt Parameters for Lu₂O₃:Er³⁺ Phosphor

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