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- W2337113160 abstract "Intense green emitting Tb 3+ (0.5 - 4 mol %) doped KCaBO3 nanocrystalline phosphors were synthesized by combustion method at 550 ˚C , followed by post annealing at 800 ˚C for 2 hours. X-ray diffraction (XRD), diffuse reflectance (DR) spectroscopy and photoluminescence (PL) spectroscopy were utilized to investigate the structural, optical and PL properties of the phosphors. XRD results revealed that the phosphors have monoclinic crystal structures with space group P21/c. The average crystallite sizes of the phosphors calculated using the XRD data were found to be in the range of 27-42 nm. Under UV excitation, the phosphors showed several emission bands centered at 487 nm, 544 nm, 586 nm and 622 nm which corresponded to 5 D4→ 7 F6, 5 D4→ 7 F5, 5 D4→ 7 F4 and 5 D4→ 7 F3 characteristic transition of the Tb 3+ ion, and the green emission band ( 5 D4→ 7 F5) located at 544 nm was dominant. In order to determine the optimum PL emission intensity, the concentration of Tb 3+ was varied. A maximum intensity was obtained from the phosphor with 3.0 mol% of Tb 3+ .The calculated CIE coordinates were (x =0.30, y= 0.59), which corresponded to the green shade of the gamut, was in good agreement with the CIE coordinates of the well known green phosphors. In addition, the chemical compositions and electronic states of the powders were analyzed with X-ray photoelectron spectroscopy." @default.
- W2337113160 created "2016-06-24" @default.
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- W2337113160 date "2015-01-01" @default.
- W2337113160 modified "2023-09-23" @default.
- W2337113160 title "Luminescence, Optical and Surface Studies of Green Emitting KCaBO3:Tb 3+ Nanophosphors" @default.
- W2337113160 hasPublicationYear "2015" @default.
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