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[Preparation and luminescent properties of ZnMoO4: Tb3+]
Namila1, Fu-Ming Wang, Xi-Gui Wang
1School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China. namila@imnu.edu.cn
Abstract:
Tb3+ doped ZnMoO4 materials were synthesized by combustion method. XRD results show that the samples completely formed single ZnMoO4 phase at 700 degrees C which belongs to Trigonal, while the incorporation of Tb3+ does not affect the basic structure of ZnMoO4. The TG-DTA results show that the samples fully formed ZnMoO4 phase due to the energy absorption at about 680 C. IR results show that there were no other organic peaks after burning at 700 C, indicating that citric acid has been completely decomposed and Tb3+ ions have been fully integrated into the lattice of ZnMoO4. SEM results show that the dispersion of particles gradually increases along with the improvement of the temperature. The best excitation wavelength was 488 nm when the monitoring wavelength was 544 nm, which corresponds to the 5D4 -->7F5 transition of Tb3+. Finally, a valuable green fluorescent powder of ZnMoO4: Tb3+ has been obtained.
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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.