Photoluminescence properties of LiTi2 - xEux(PO4)3phosphor.
A solid-state reaction route-based LiTi2 - xEux(PO4)3was phosphor synthesized for the first time to evaluate its luminescence performance by excitation, emission and lifetime (τ) measurements. The LiTi2 - xEux(PO4)3phosphor was excited at λexci.= 397 nm to give an intense orange-red (597 nm) emission attributed to the5D0→7F1magnetic dipole (ΔJ = ±1) transition and red (616 nm) emission (5D0→7F2), which is an electric dipole (ΔJ = ±2) transition of the Eu3+ion. Beside this, excitation and emission spectra of host LiTi2(PO4)3powder were also reported. The effect of Eu3+concentration on luminescence characteristics was explained from emission and lifetime profiles. Concentration quenching in the LiTi2 - xEux(PO4)3phosphor was studied from the Dexter's model. Dipole-quadrupole interaction is found to be responsible for energy transfer among Eu3+ions in the host lattice. The LiTi2 - xEux(PO4)3phosphor displayed a reddish-orange colour realized from a CIE chromaticity diagram. We therefore suggest that this new phosphor could be used as an optical material of technological importance in the field of display devices. Copyright © 2016 John Wiley & Sons, Ltd.
Department of Physics, Sri Venkateswara University, Tirupati, 517502, India.|Department of Materials Science and Engineering, Korea University, 145 Anam-ro Seonbuk-gu, Seoul, 136-713, South Korea.
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Ramaraghavulu
Department of Physics, Sri Venkateswara University, Tirupati, 517502, India.
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Naresh
School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore.
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Eswaraiah
D005063:Europium / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D049449:Luminescence; D010710:Phosphates / Q000737:chemistry*; D055668:Photochemical Processes; D014025:Titanium / Q000737:chemistry*
D010710:Phosphates; D005063:Europium; D008094:Lithium; D014025:Titanium
LiTi2 − xEux(PO4)3; concentration quenching; luminescence