期刊
JOURNAL OF LUMINESCENCE
卷 205, 期 -, 页码 179-189出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.09.002
关键词
Crystal structure; Raman; Luminescence; Energy transfer; Judd-Ofelt
类别
资金
- Kerala State Council for Science, Technology and Environment (KSCSTE), Govt. of Kerala, India
Red emitting ZnO:Eu3+ nanostructures were synthesized by co-precipitation method. X-ray diffraction and Raman spectra indicated the formation of hexagonal wurtzite structure with preferential growth along (101) crystal plane. It is found that Eu3+ incorporation alter the morphology of the ZnO:Eu3+ nanostructures from rod to flower-like structures. The existence of trivalent europium ions in the ZnO lattice was confirmed by X-ray photoelectron spectroscopy. A defect-mediated energy transfer pathway from the ZnO host to the Eu3+ ions was identified in ZnO:Eu(3+ )nanoparticles, when excited with He-Cd laser of wavelength 442 nm. The observed intense red emission was due to intra 4f-4f transitions of Eu3+ ions. The emission intensity of ZnO:Eu3+ nanostructures was found to increase with europium content up to 2 at%, beyond that quenching was observed and is attributed to the multipole-multipole interactions. Life time measurements of all samples revealed the single exponential behaviour of luminescence decay profiles. Higher value of Judd-Ofelt intensity parameter (Omega(2)) and asymmetric ratio obtained indicated the reduction in symmetry around Eu3+ ions in these phosphors. CIE chromaticity and correlated color temperature analysis of these ZnO:Eu3+ nanoparticles have shown that the emission is in the red region with high color purity.
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