Photoluminescence properties of LiTi2 − xEux(PO4)3 phosphor |
| |
| Authors: | R Ramaraghavulu V Naresh V Eswaraiah |
| |
| Institution: | 1. Department of Physics, Sri Venkateswara University, Tirupati, India;2. Department of Materials Science and Engineering, Korea University, Seoul, South Korea;3. School of Materials Science and Engineering, Nanyang Technological University, Singapore |
| |
| Abstract: | A solid‐state reaction route‐based LiTi2 ? xEux(PO4)3 was phosphor synthesized for the first time to evaluate its luminescence performance by excitation, emission and lifetime (τ) measurements. The LiTi2 ? xEux(PO4)3 phosphor was excited at λexci. = 397 nm to give an intense orange–red (597 nm) emission attributed to the 5D0 → 7F1 magnetic 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)3 powder 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)3 phosphor 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)3 phosphor 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. |
| |
| Keywords: | luminescence concentration quenching LiTi2 − xEux(PO4)3 |
|
|
