Synthesis, characterization and photoluminescence properties of Tm 3+-doped Ca ₂YTaO ₆ blue-emitting phosphors

摘要

A series of Ca_(2)YTaO_(6): Tm~(3+)blue-emitting phosphors were firstly prepared by the solid-state method. The phase formations and purity of Ca_(2)YTaO_(6): x Tm~(3+)( x = 0.3%-5% mol) were verified by X-ray powder diffraction. The morphological characteristics of Ca_(2)YTaO_(6): 0.005Tm~(3+)were detected by scanning electron microscopy (SEM). Photoluminescence properties were discussed by emission ( λ _(em)?=?460?nm) and excitation ( λ _(ex)?=?359?nm) spectra. The critical doping concentration of the products was 0.005 mol. The proposed concentration quenching mechanism in Ca_(2)YTaO_(6)materials was the electric multipole interaction. Besides, the color coordinates (0.1408, 0.0891) of Ca_(2)YTaO_(6): 0.005Tm~(3+)were located in blue region. The results suggested the Ca_(2)YTaO_(6): Tm~(3+)phosphors can be promising blue-emitting components for the WLED applications.