Abstract
Cr3+ -doped Y2 O3 (0.5-9mol%) was synthesized by a simple solution combustion method using Aloe vera gel as a fuel/surfactant. The final obtained product was calcined at 750°C for 3h, which is the lowest temperature reported so far for the synthesis of this compound. The calcined product was confirmed for its crystallinity and purity by powder X-ray diffraction (PXRD) studies which showed a single-phase nano cubic phosphor. The particles size estimated by Scherrer formula was in the range of 6-19nm. The UV-vis spectra showed absorption bands at 198, 272 and 372nm having band gap energy in the range 4.00-4.26eV. In order to investigate the possibility of its use in white light emitting display applications, the photoluminescence properties of Cr3+ -doped Y2 O3 nanophosphors were studied at an excitation wavelength in the near ultraviolet (UV) light region (361nm). The emission spectra consisted of emission peaks in the blue (4 F9/2 →6 H15/2 ), orange (4 F9/2 →6 H13/2 ) and red (4 F9/2 →6 H11/2 ) regions. The CIE coordinates (0.33, 0.33) lie in the white light region. Hence Y2 O3 :Cr3+ can be used for white light-emitting diode (LED) applications.
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