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Abstract Visible and infrared absorption and emission spectra of Er3+-doped strontium gadolinium gallate (SrGdGa 3 O 7) single-crystal were measured at room temperature. From the measured fluorescence spectra, the Er3+ emission cross section spectra were calculated at first. Then, by utilizing McCumber relation, the absorption cross section spectra were further calculated. In parallel, the absorption cross section spectra were also calculated from the measured absorption spectra of the crystal, and compared with those spectra calculated from the McCumber relation. The comparison shows that the absorption cross section spectra obtained using the McCumber relation are in reasonable agreement with those deduced from the measured absorption spectrum. Graphical abstract Visible, near-infrared, and mid-infrared emission and absorption cross section spectra of Er3+ in SrGdGa 3 O 7 single-crystal have been calibrated from measured fluorescence spectra using the McCumber theory. The absorption cross-section spectrum was also calibrated from the measured absorption spectrum. Comparison shows that the absorption cross section spectra calibrated from the McCumber theory are reasonably consistent with those from the absorption spectrum. Present work presents complete cross section knowledge of the studied crystal. fx1 [ABSTRACT FROM AUTHOR]

Validity of Judd-Ofelt spectroscopy based on measured diffuse reflectance spectrum and fluorescence lifetime of a purely radiative electronic transition of rare-earth-ion in a powder material has been demonstrated. Two representative powder samples of Er3+-doped LiNbO 3 and Er3+/Yb3+-codoped NaYF 4 , which have considerably different phonon energies, 880 and 380 cm−1, respectively, have been exemplified to demonstrate the validity. First, diffuse reflectance spectrum was measured for each powder sample and relative absorption spectrum was calibrated from it using Kubelka-Munk relation. Second, fluorescence lifetime of purely radiative 1.5 μm emission of Er3+ was measured and absolute absorption cross-section spectrum was calibrated on the basis of the assumption that the measured 1.5 μm fluorescence lifetime equals the radiative lifetime. Finally, the Judd-Ofelt parameters Ω t (t = 2, 4, 6) are calculated on the basis of the absolute absorption cross-section spectrum. For comparison, Judd-Ofelt analysis was also performed on the Er3+-doped LiNbO 3 single-crystal on the basis of the absorption spectrum obtained from Beer-Lambert law. The Ω t result of Er3+-doped LiNbO 3 powder sample is compared with that of single-crystal state. The comparison shows that the Ω t result of the powder sample can be considered as the same as that of the single-crystal state within the error, confirming the validity of the method. The study on the Er3+/Yb3+-codoped NaYF 4 microcrystal powder allows us to reach the same conclusion. • A method for Judd-Ofelt (J-O) analysis of a phosphor material is validated. • The method is based on diffuse reflectance spectrum and fluorescence lifetime. • It is validated by comparing J-O results of Er:LiNbO 3 powder and single crystal. • And by comparing the results of Er/Yb:NaYF 4 powder with those reported earlier. • Results of powder and single-crystal states are same, validating thus the method. [ABSTRACT FROM AUTHOR]