Luminescence of one dimensional ZnO, GeO2–Zn2GeO4 nanostructure through thermal evaporation of Zn and Ge powder mixture

Pham, Vuong-Hung; Kien, Vu Trung; Tam, Phuong Dinh; Huy, Phạm Thành

doi:10.1016/j.mseb.2016.03.001

Cited by 11 publications

(2 citation statements)

References 37 publications

(39 reference statements)

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“…[12][13][14] Visible emission bands have also been reported in Zn 2 GeO 4 and attributed to the above mentioned DAP recombination processes in a general way. 15,16 Moreover, its luminescence has been found to be influenced by the synthesis route of the material, signaling that not only vacancies but also interstitial defects could play an active role in the optical response. 15,17 Also, the observation of both visible photoluminescence (PL) and UV cathodo-luminescence (CL) bands from high quality microrods of Zn 2 GeO 4 obtained by a thermal evaporation method 18 suggests that either UV or visible emission is feasible in Zn 2 GeO 4 under certain excitation conditions, i.e.…”

Section: Introductionmentioning

confidence: 99%

Understanding the UV luminescence of zinc germanate: The role of native defects

et al. 2020

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Achieving efficient and stable ultraviolet emission is a challenging goal in optoelectronic devices. Herein, we investigate the UV luminescence of zinc germanate Zn 2 GeO 4 microwires by means of photoluminescence measurements as a function of temperature and excitation conditions. The emitted UV light is composed of two bands (a broad one and a narrow one) associated with the native defects structure. In addition, with the aid of density functional theory (DFT) calculations, the energy positions of the electronic levels related to native defects in Zn 2 GeO 4 have been calculated. In particular, our results support that zinc interstitials are the responsible for the narrow UV band, which is, in turn, split into two components with different temperature dependence 1 arXiv:2007.15336v1 [cond-mat.mtrl-sci] 30 Jul 2020 behaviour. The origin of the two components is explained on the basis of the particular location of Zn i in the lattice and agrees with DFT calculations. Furthermore, a kinetic luminescence model is proposed to ascertain the temperature evolution of this UV emission. These results pave the way to exploit defect engineering in achieving functional optoelectronic devices to operate in the UV region.

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Section: Introductionmentioning

confidence: 99%

Understanding the UV luminescence of zinc germanate: The role of native defects

et al. 2020

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“…[ 4,9–12 ] Thermal annealing of precursor materials containing Zn and Ge has been revealed as an effective method to produce high‐quality crystalline Zn 2 GeO 4 microrods and nanowires under the vapor–solid mechanism. [ 5,13 ] In particular, luminescence in the UV and in the visible range depending on the probe energy, above of below the energy bandgap, has been observed in Zn 2 GeO 4 microrods synthetized by a thermal treatment of a mixture of ZnO and Ge. [ 8 ] One of the key parameters in this case is the ratio between the precursors in the initial mixture.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of the Thermal Quenching of the Ultraviolet Emission in Zn₂GeO₄ Microrods

Dolado

Hidalgo

Méndez

2022

Physica Rapid Research Ltrs

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Zn2GeO4 microrods obtained by thermal evaporation of a compacted powder mixture of ZnO and Ge exhibit quite intense UV luminescence at low temperatures. Herein, the luminescence properties of Zn2GeO4 microrods are studied for 2:1 and 1:1 ZnO:Ge ratio in the precursor mixture. In both cases, Zn2GeO4 microrods of high crystal quality produce a 355 nm emission under aforementioned bandgap excitation conditions at low temperatures. However, this emission vanishes at room temperature (RT) in the 1:1 samples while it is kept in the 2:1 ones. Herein this work, the thermal quenching of the UV luminescence is studied by means of steady and time‐resolved photoluminescence techniques from 4 K up to RT for both Zn2GeO4 microrods. The analysis of the results leads us to conclude that although the luminescence mechanisms are the same in both cases, a higher decay rate is observed in the 1:1 in both intensity and lifetime, which explain the observed thermal quenching at RT.

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Correlative Study of Vibrational and Luminescence Properties of Zn₂GeO₄ Microrods

Dolado¹,

Hidalgo²,

Méndez³

2018

Physica Status Solidi (a)

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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 Zn2GeO4. 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 Zn2GeO4 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 Zn2GeO4 structure.

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Luminescence of one dimensional ZnO, GeO2–Zn2GeO4 nanostructure through thermal evaporation of Zn and Ge powder mixture

Cited by 11 publications

References 37 publications

Understanding the UV luminescence of zinc germanate: The role of native defects

Understanding the UV luminescence of zinc germanate: The role of native defects

Kinetic Study of the Thermal Quenching of the Ultraviolet Emission in Zn₂GeO₄ Microrods

Correlative Study of Vibrational and Luminescence Properties of Zn₂GeO₄ Microrods

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Luminescence of one dimensional ZnO, GeO2–Zn2GeO4 nanostructure through thermal evaporation of Zn and Ge powder mixture

Cited by 11 publications

References 37 publications

Understanding the UV luminescence of zinc germanate: The role of native defects

Understanding the UV luminescence of zinc germanate: The role of native defects

Kinetic Study of the Thermal Quenching of the Ultraviolet Emission in Zn2GeO4 Microrods

Correlative Study of Vibrational and Luminescence Properties of Zn2GeO4 Microrods

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Product

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Kinetic Study of the Thermal Quenching of the Ultraviolet Emission in Zn₂GeO₄ Microrods

Correlative Study of Vibrational and Luminescence Properties of Zn₂GeO₄ Microrods