Rebuttal to “On the luminescent properties of Dy3+: ß-Li2TiO3 [comments on synthesis and emission analysis of RE3+ (Eu3+ or Dy3+):Li2TiO3] by Cheng-long Yu”

Through this Letter to the Editor (Rebuttal), we had given our explanation for the queries raised by Professor Cheng-long Yu. We the authors (G. Bhaskar Kumar and S. Buddhudu) have not prepared the RE3+ (Eu3+ or Dy3+):Li2TiO3 ceramics by stoichiometric method. Further, we did not mention anywhere in the manuscript that we had doped the RE3+ (Eu3+ or Dy3+) ions in the Li2TiO3 matrix. The authors (G. Bhaskar Kumar and S. Buddhudu) have prepared the RE3+ (Eu3+ or Dy3+):Li2TiO3 ceramics by non-stoichiometric method only. Hence we did describe the prepared compound as RE3+ (Eu3+ or Dy3+) ions containing (that means it is not doped) Li2TiO3 ceramics. Therefore, the authors did not compare the obtained XRD diffraction pattern with any JCPDS data of Li2TiO3 compound. With regard to photoluminescence analysis of Eu3+ ions containing Li2TiO3 ceramics, it displayed a bright red emission at 611 nm (5D0→7F2) with an excitation at λexci=392 nm (7F0→5L6). In regards of Dy3+:Li2TiO3, a blue emission at 493 nm (4F9/2→6H15/2) and also an yellow emission at 582 nm (4F9/2→6H13/2) have been observed with λexci=366 nm (6H15/2→6P5/2). The obtained excitation or emission bands are the characteristic bands of the Eu3+and Dy3+ ions, respectively. Hence we stated that prepared ceramics are brightly luminescent and since these results are not published previously, we mentioned the prepared RE3+ (Eu3+ or Dy3+):Li2TiO3 ceramics as novel optical materials.