Abstract
Nanoparticles of Eu3+ doped TiO2 have been synthesized by the hydrothermal technique. Structural, morphological, and luminescence characteristics of the nanophosphors were examined in detail. The powder X-ray diffraction pattern reveals that below 9 mol% concentration of Eu3+ doped TiO2, all samples show the anatase phase with tetragonal structure.The photoluminescence studies showed that as-synthesized samples exhibited excellent luminescence property due to the conversion of energy from the host matrix to europium ions. The Judd− Ofelt (JO) analysis was used to study the such spectroscopic parameters as branching ratio, emission cross-section, gain bandwidth, and gain coefficient for all the samples. The concentration quenching was seen and this may be due to the nonradiative energy transfer by the multipole-multipole mechanism. The emission spectra were recorded under the excitation at 376 nm revealed enhanced asymmetric ratios. That confirms the improved color purity (97%) for all the samples. The color coordinates of 1–11 mol% Eu3+ doped TiO2 samples were calculated by Commission international del’ Eclirage (CIE) algorithm and they and are in good agreement with standard NTSC coordinates (0.62, 0.37) of optimized concentration of Eu3+ doped TiO2 sample. Thus, the samples are promising candidates for such applications as lighting, displays, and laser systems.
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