Abstract
In this work, the structural and luminescence properties of a series of CaLa4-xSi3O13:xHo3+ (0.01 ≤ x ≤ 0.11) phosphors prepared by conventional sol-gel technique are reported. The hexagonal phase of the samples was analyzed through X-ray diffraction (XRD). The CaLa4-xSi3O13:xHo3+ phosphors exhibited intense absorption in the visible region of the diffuse reflectance and photoluminescence excitation (PLE) spectrum and presented a highest band at 463 nm ascribed to 5G6+5F1 transition from Ho3+ ions. The Kubelka-Munk (K-M) function was utilized to extract Eg (energy band gap) of the sample from the reflectance spectrum of CaLa3.97Si3O13:0.03Ho3+ phosphor. The Eg =3.83 eV and Eg =3.04 eV were evaluated for the direct and indirect band structure of the CaLa3.97Si3O13:0.03Ho3+ sample, respectively. A strong photoluminescence emission (PL) was observed at 546 nm (green color) for 5S2+5F4→5I8 transition. The concentration quenching was observed beyond x =0.03 mol in CaLa4-xSi3O13:xHo3+ phosphors due to non-radiative energy transfer through cross-relaxation. The chromaticity coordinates of the CaLa3.97Si3O13:0.03Ho3+ phosphor (x = 0.33904, y = 0.65575) recommended its suitability in green emission for white light emitting diode applications.
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