Abstract
The single-phase Ho3+-doped Yb3Ga5O12 garnet nanocrystals were synthesized by the sol-gel combustion technique using citric acid. Their structure, morphology and chemical composition were examined by the powder X-ray diffraction, attenuated total reflectance-Fourier transform infrared spectroscopy and Energy-dispersive X-ray spectrometry with the scanning electron microscope. The observed strong absorption band associated with the high content of Yb3+ ensures efficient excitation of the Yb15−xHoxGa25O60 garnets using 980 nm radiation. The near-infrared emission originating from the Ho3+: 5I6 → 5I8 and 5I7 → 5I8 transitions is studied using the measurement of the steady-state and time-dependent emission spectra. The proposed luminescence mechanism is discussed based on the Yb3+ → Ho3+ energy transfer with contribution of the Ho3+ → Yb3+ energy back transfer and Ho3+ ↔ Ho3+ cross-relaxation processes.
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