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Influence of co-doping alkali metal ions Li + /Na + /K + on the luminescence enhancement properties of the blue emission from Pb 2+ /Bi 3+ activated di-barium calcium di-zinc hexa-silicate based phosphors for solid state light applications

Journal of Luminescence, ISSN: 0022-2313, Vol: 253, Page: 119446
2023
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The non rare earth element Pb 2+ /Bi 3+ activated and alkali metal Li + /Na + /K + ions codoped with the silicate based Ba 2 CaZn 2 Si 6 O 17 (hereafter mentioned as BCZSO) blue-emitting phosphors were prepared through a simple solid state reaction route and characterized. The phase identification of the as prepared samples was done by taking the powder X-ray diffraction (PXRD). The Rietveld refinement of the as prepared phosphor was analyzed. The morphological analysis was performed using the scanning electron microscope (SEM). The photoluminescence (PL) and PL excitation (PLE) properties of the phosphors were investigated. Exciting the BC 1-x ZSO:xPb 2+ phosphor with 295 nm light yielded a wide blue emission centered at 438 nm. Also, when the BC 1-x ZSO:xBi 3+ phosphor was excited with 317 nm, a bright blue emission at 465 nm was observed. The Stokes shift values of these phosphors were calculated to be 11,067, and 10,040 cm −1 in the same order. The optimum concentrations for the Pb 2+, and the Bi 3+ ions in the BCZSO host were found to be 3 and 7 mol % respectively. The critical distance (Rc) values were calculated to be 29.32 Å and 23.05 Å for the Pb 2+ and the Bi 3+ activated BCZSO phosphors respectively. When the alkali metal ions were co-doped in the blue emitting phosphors, a PL enhancement was observed. The decay lifetime was calculated for the BCZSO: M (M:Pb 2+ /Bi 3+ ) phosphors, and found to decline with increasing concentration of the activators. The CIE color coordinates, and the quantum efficiency of these silicate phosphors were calculated. These values for the BC 1-x ZSO:xPb 2+ phosphor were closer to the commercial blue BaMgAl 10 O 17 :Eu 2+ (BAM) phosphor. In addition, the temperature dependent photoluminescence (TDPL) spectra were recorded to examine the thermal stability of this phosphor. These results suggest that the BCZSO:M (M:Pb 2+ /Bi 3+ ) and the BC 1-x-y ZSO:xPb 2+ /Bi 3+, yLi + /Na + /K +, blue emitting phosphors can serve as promising candidates for white light emitting diodes (WLEDs).

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