Intensity analysis and crystal-field modeling of Ho3+ in KPb2Cl5 host

Sardar, Dhiraj K.; Chandrasekharan, Sree R.; Nash, Kelly L.; Gruber, John B.; Burger, Arnold; Roy, Utpal N.

doi:doi:10.1063/1.2919765

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Optical absorption and emission intensities are investigated for Ho³⁺ doped into single-crystal KPb₂Cl₅. Room temperature absorption spectra of Ho³⁺(4f¹⁰), representing transitions from ⁵I₈ to excited multiplet manifolds observed between 400 and 2100 nm, have been analyzed using the Judd–Ofelt (JO) model to obtain the phenomenological intensity parameters Ω₂, Ω₄, and Ω₆. The JO intensity parameters are used to calculate the spontaneous emission probabilities, radiative lifetimes, and branching ratios of the Ho³⁺ transitions from the upper multiplet manifolds to the corresponding lower-lying multiplet manifolds ^2S+1L_J of Ho³⁺. The room temperature fluorescence spectrum in the near infrared region is reported between 850 and 1550 nm. The emission cross section for the intermanifold transition, ⁵F₅→⁵I₇ (0.98 μm) has been determined. The 8 K absorption spectrum was examined as well. The detailed structure observed in the absorption bands ⁵I₇, ⁵S₂, ⁵F₄, and ⁵F₃, was analyzed in terms of the crystal-field splitting of each manifold using a charge-compensation model first developed for Er³⁺ doped into KPb₂Cl₅. The optical and spectroscopic characteristics of Ho³⁺:KPb₂Cl₅ demonstrate that this material has potential as a laser host system at various wavelengths.

Article Outline

INTRODUCTION
MATERIALS AND METHODS
DATA ANALYSIS
1. Electric dipole contribution
2. Magnetic dipole contribution
3. The emission cross section
4. Modeling the crystal-field splitting
SUMMARY

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KEYWORDS and PACS

Keywords

crystal field interactions, fluorescence, holmium, infrared spectra, Judd-Ofelt theory, lead compounds, potassium compounds, radiative lifetimes, spectral line intensity

PACS

71.70.Ch

Crystal and ligand fields
78.55.Hx

Other solid inorganic materials
78.30.Hv

Other nonmetallic inorganics

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.2919765

PUBLICATION DATA

ISSN

0021-8979 (print)

1089-7550 (online)

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$abstract.society.value is a Member of CrossRef

The American Physical Society

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