Validity of Judd-Ofelt spectroscopy based on diffuse reflectance spectrum and fluorescence lifetime of phosphor

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Sai-Dong Xue
  • Mei-Hong Liu
  • Pei Zhang
  • Wing-Han Wong
  • De-Long Zhang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number117304
Journal / PublicationJournal of Luminescence
Volume224
Online published22 Apr 2020
Publication statusPublished - Aug 2020

Abstract

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 LiNbO3 and Er3+/Yb3+-codoped NaYF4, 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 Ωt (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 LiNbO3 single-crystal on the basis of the absorption spectrum obtained from Beer-Lambert law. The Ωt result of Er3+-doped LiNbO3 powder sample is compared with that of single-crystal state. The comparison shows that the Ωt 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 NaYF4 microcrystal powder allows us to reach the same conclusion.

Research Area(s)

  • Judd-Ofelt spectroscopic analysis

Citation Format(s)

Validity of Judd-Ofelt spectroscopy based on diffuse reflectance spectrum and fluorescence lifetime of phosphor. / Xue, Sai-Dong; Liu, Mei-Hong; Zhang, Pei; Wong, Wing-Han; Zhang, De-Long.

In: Journal of Luminescence, Vol. 224, 117304, 08.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal