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Start Over Author "Can, N." Publisher elsevier b.v.
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34. Synthesis, characterization and enhanced photoluminescence and temperature dependence of ZrO2:Dy3+ phosphors upon incorporation of K+ ions.

Author

Can, N., Coban, M.B., Souadi, G., Kaynar, Ümit H., Ayvacikli, M., Garcia Guinea, J., and Ekdal Karali, E.

Subjects
*PHOTOLUMINESCENCE, *PHOSPHORS, *SPECTRUM analysis, *LIGHT emitting diodes, *IONS, *INFRARED spectroscopy
Abstract

This study reports the successful synthesis and comprehensive characterization of ZrO 2 :Dy3+ phosphors with the incorporation of K+ ions. The introduction of Dy3+ and K+ in the ZrO 2 lattice as lanthanide activators demonstrates its potential as an efficient host material. The structural integrity of ZrO 2 remains unaltered following the doping process. Fourier-transform infrared spectroscopy (FTIR) analysis confirms the presence of Zr-O and O-H stretching, along with H 2 O bending modes in the phosphor sample. The wide luminescence band seen at 460 nm is attributed to luminescence defects in the ZrO 2 induced by oxygen, and the presence of water molecules. Photoluminescence (PL) spectra analysis reveals pronounced emission peaks at 491 and 578 nm, corresponding to 4F 9/2 → 6H 15/2 and 4F 9/2 → 6H 13/2 transitions, respectively, upon excitation at 349 nm. Optimizing the Dy3+ doping concentration to 0.4 wt% and achieving a critical distance of 31.82 Å resulted in efficient energy transfer. Notably, co-doping K+ as a charge compensator significantly enhances the luminescence intensity. Moreover, at lower temperatures, direct excitation of Dy3+ ions through our pump wavelength, coupled with exciton-mediated energy transfer, leads to a remarkable increase in PL intensity. Tailoring the doping concentrations effectively shifts the emission spectrum of the phosphor mixture, aligning with the standard white light illumination coordinates (0.333, 0.333). This property positions the material as a promising candidate for applications in white light-emitting diodes (WLEDs) and various high-quality lighting applications. The enhanced photoluminescence and temperature dependence observed in ZrO 2 :Dy3+ phosphors upon the incorporation of K+ ions pave the way for their potential utilization in advanced luminescent devices. [ABSTRACT FROM AUTHOR]

Published
2023
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