Up-conversion routines of Er3+–Yb3+ doped Y6O5F8 and YOF phosphors

• Single-phase optical materials of Y6O5F8:Er and YOF:Er were prepared.
• Effective spectral converting properties were observed in Y6O5F8:Er,Yb.
• 980 nm diode laser was irradiated for up-converting analysis.
• A multi-photon process in the phosphors was investigated.

Optical materials composed of a Y6(1−p−q)Er6pYb6qO5F8 (p = 0.001–0.1, q = 0.005–0.1) solid solution with Y0.99Er0.01OF were prepared via a solid-state reaction using excess NH4F flux at 950 °C for 30 min. X-ray diffraction patterns of Y6(1−p−q)Er6pYb6qO5F8 and Y0.99Er0.01OF were compared upon altering the synthesis temperature and the molar ratio of the NH4F flux to the Y3+ (Er3+, Yb3+) ions. The effective spectral-conversion properties of Er3+ and Er3+–Yb3+ ions in Y6O5F8 phosphors were monitored during excitation with a 980 nm wavelength diode-laser. Selection of appropriate Er3+ and/or Yb3+ concentrations in the Y6O5F8 structure led to achievement of the desired up-conversion emission, from the green to the red regions of the spectra. Furthermore, the mechanism of up-conversion in the phosphors was described by an energy-level schematic. Up-conversion emission spectra and the dependence of the emission intensity on pump power (between 193 and 310 mW) in the Y6(0.995−q)Er0.03Yb6qO5F8 phosphors were also investigated.

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