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 2, 4, and 6. 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+1LJ 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 m 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. © 2008 The American Physical Society. DOI: 10.1063/1.2919765 I
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