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Correlative Study of Vibrational and Luminescence Properties of Zn 2 GeO 4 Microrods
Author(s) -
Dolado Jaime,
Hidalgo Pedro,
Méndez Bianchi
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800270
Subject(s) - luminescence , raman spectroscopy , photoluminescence , materials science , germanate , zinc , molecular vibration , spectroscopy , polarizer , analytical chemistry (journal) , ultraviolet , optoelectronics , optics , chemistry , doping , physics , birefringence , quantum mechanics , chromatography , metallurgy
The optical properties of zinc germanate microrods are investigated and correlated with vibrational modes of the crystalline structure. The samples are grown by a thermal evaporation method using ZnO and Ge as precursors. Polarized Raman spectroscopy and polarized micro‐photoluminescence techniques are applied in order to shed some light into the origin of the luminescence in Zn 2 GeO 4 . Oxygen defects are usually responsible for light emission in most of semiconducting oxides. Here, the authors report two luminescence bands at room temperature, a broad green one at about 2.4 eV and an ultraviolet one at 3.2 eV, which are of composed nature. In addition, the authors observe changes in the Raman and PL spectra recorded with polarizers oriented parallel or orthogonal to the microrod axis. The evolution of the luminescence bands in Zn 2 GeO 4 and their correlation with the observed Raman modes (O‐Ge‐O and Ge‐O‐Zn vibration modes) are discussed in the framework of oxygen defects in the Zn 2 GeO 4 structure.