Study synthetic method, photoluminescence mechanism and optimistic applications of KAlSiO 4 Phosphor

Abstract

KAlSiO4:Eu3+, Tb3+ phosphor synthesized first time by simple combustion method. The X-ray diffraction (XRD) study confirms that the KAlSiO4 phosphor matrix successfully matches to standard JCPDS database file. Photoluminescence properties observed for rare earth Eu3+, Tb3+ at various concentration (x = 0.3, 0.5, 1.0, 1.3 mole %) shows an optimistic luminescence property. KAlSiO4 matrix shows unique emissions of Eu2+ and Eu3+ ions when excited by 395 nm, where the utmost emission intensity was received when x = 1.0 mole%. The excitation spectra of KAlSiO4:Eu3+ give proper peak position at 262 nm, 395 nm, and 465 nm corresponding to O2+→ Eu3+, 7F0 →5L6, 7F0 → 5D2. While sharp emissions peaked at 593 nm and 613 nm are obtained by 7F0 → 5D1 and 7F0 → 5D2 transitions. On the other hand, KAlSiO4:Tb3+ shows the excitation peak position at 352 nm,370 nm, and 378 nm which gives the sharp green emission peak at 545 nm due to the 5D4 →5F5 transitions. The particle size and elemental constitution determine using SEM-EDX analysis which is in the range of micrometers in size. The band gap and refractive index are determined using UV-visible spectroscopy. CIE chromaticity coordinate shows multicolor emission for KAlSiO4:Eu3+ while the green color emission for the KAlSiO4:Tb3+ phosphor. Photoluminescence (Pl) spectroscopy reveals the exciting luminescent properties of the KAlSiO4:Eu3+, Tb3+ phosphor which may be applicable potential phosphor for fabrication of various light emitting devices.