Luminescence properties of ZnS:Cu, Eu semiconductor nanocrystals synthesized by a hydrothermal process

ZnS:Cu,Tm nanocrystal with 15nm cubic structures have been synthesized by hydrothermal approach at 200°C. The photoluminescence (PL) properties and the effect of hydrothermal treatment time on the structure, morphology and PL spectra of ZnS:Cu,Tm samples have been studied. The as-obtained samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and FT-IR spectra.The result indicated that the PL emission spectrum of codoped with Cu and Tm sample compares with undoped ZnS and doped with Cu alone samples has a significant changes, while the PL emission peak has red shift and PL emission intensity increased. The samples size and crystallization are increase with extending of the treatment time. However, when the hydrothermal treatment time is too long(>12h), the PL emission intensity of sample instead of decreased. Demonstrated changes in surface state of nanomaterials have a greater impact on its luminescence properties.

Download Full-text

Self-assembly of LaBO3:Eu twin microspheres synthesized by a facile hydrothermal process and their tunable luminescence properties

Materials Research Bulletin ◽

10.1016/j.materresbull.2011.11.015 ◽

2012 ◽

Vol 47 (2) ◽

pp. 247-252 ◽

Cited By ~ 22

Author(s):

Jingchao Zhang ◽

Min Yang ◽

Hua Jin ◽

Xiaofeng Wang ◽

Xudong Zhao ◽

...

Keyword(s):

Self Assembly ◽

Hydrothermal Process ◽

Luminescence Properties ◽

Facile Hydrothermal Process

Download Full-text

Graphene Oxide Concentration Effect on the Optoelectronic Properties of ZnO/GO Nanocomposites

Nanomaterials ◽

10.3390/nano10081532 ◽

2020 ◽

Vol 10 (8) ◽

pp. 1532

Author(s):

Issam Boukhoubza ◽

Mohammed Khenfouch ◽

Mohamed Achehboune ◽

Liviu Leontie ◽

Aurelian Catalin Galca ◽

...

Keyword(s):

Graphene Oxide ◽

Zno Nanorods ◽

Hydrothermal Process ◽

Color Space ◽

Hexagonal Wurtzite Structure ◽

Zinc Oxide Nanorods ◽

Luminescence Properties ◽

A Charge ◽

Average Coherence ◽

The Impact

In this work, the effects of graphene oxide (GO) concentrations (1.5 wt.%, 2.5 wt.%, and 5 wt.%) on the structural, morphological, optical, and luminescence properties of zinc oxide nanorods (ZnO NRs)/GO nanocomposites, synthesized by a facile hydrothermal process, were investigated. X-ray diffraction (XRD) patterns of NRs revealed the hexagonal wurtzite structure for all composites with an average coherence length of about 40–60 nm. A scanning electron microscopy (SEM) study confirmed the presence of transparent and wrinkled, dense GO nanosheets among flower-like ZnO nanorods, depending on the GO amounts used in preparation. Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–Vis) absorption spectroscopy, and photoluminescence (PL) measurements revealed the impact of GO concentration on the optical and luminescence properties of ZnO NRs/GO nanocomposites. The energy band gap of the ZnO nanorods was independent of GO concentration. Photoluminescence spectra of nanocomposites showed a significant decrease in the intensities in the visible light range and red shifted suggesting a charge transfer process. The nanocomposites’ chromaticity coordinates for CIE 1931 color space were estimated to be (0.33, 0.34), close to pure white ones. The obtained results highlight the possibility of using these nanocomposites to achieve good performance and suitability for optoelectronic applications.

Download Full-text

OH− ions-controlled synthesis and upconversion luminescence properties of NaYF4:Yb3+,Er3+ nanocrystals via oleic acid-assisted hydrothermal process

Journal of Rare Earths ◽

10.1016/s1002-0721(17)60972-4 ◽

2017 ◽

Vol 35 (8) ◽

pp. 753-760 ◽

Cited By ~ 9

Author(s):

Song LI ◽

Song YE ◽

Xiao CHEN ◽

Tianhua LIU ◽

Zhuang GUO ◽

...

Keyword(s):

Oleic Acid ◽

Upconversion Luminescence ◽

Hydrothermal Process ◽

Luminescence Properties ◽

Controlled Synthesis

Download Full-text

Hydrothermal Synthesis of PAA-Coated NaYF4:Yb3+, Er3+ Nanophosphors with Predicted Morphology, Phase and Enhanced Upconversion Luminescence Properties

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2018.16384 ◽

2018 ◽

Vol 18 (12) ◽

pp. 8258-8268 ◽

Cited By ~ 2

Author(s):

Chao Tong ◽

Shaowen Xie ◽

Hu Zhou ◽

Na Li ◽

Liang Gong ◽

...

Keyword(s):

Ph Value ◽

Upconversion Luminescence ◽

Hydrothermal Process ◽

Precursor Solution ◽

Absorption Efficiency ◽

Infrared Light ◽

Luminescence Properties ◽

Initial Reaction ◽

Luminescent Intensity ◽

Hydrothermal Temperature

In this study, well-defined PAA-coated NaYF4:Yb3+, Er3+ nanophosphors were synthesized via a poly(acrylic acid) (PAA) mediated hydrothermal process. The rational control of initial reaction conditions, such as hydrothermal temperature, pH value of precursor-solution, added amount of PAA, and molecular weight of PAA ligand, resulted in upconversion of NaYF4:Yb3+, Er3+ phosphors with varying crystal phases (α and β) and morphologies (e.g., nanosphere, submicrorod, microrod, microtube, and microprism). By assessing the upconversion luminescent properties of the synthesized NaYF4:Yb3+, Er3+ phosphors upon excitation by 980 nm infrared light, it was demonstrated that the β-phase NaYF4:Yb3+, Er3+ phosphors generally presented stronger upconversion luminescent than α-phase NaYF4:Yb3+, Er3+ phosphors and orthorhombic phase of YF3:Yb3+, Er3+ sample. Additionally, the β-phase NaYF4:Yb3+, Er3+ phosphors with hollow microtube morphology presented higher upconversion luminescent intensity than phosphors of other morphologies. This may be due to microtubes having larger surface area (inner and outer surfaces), which promoted the absorption efficiency under similar excitation conditions, therefore generating higher luminescent intensity. Findings form this study suggest for precisely controlled growth of other complex rare earth fluoride compounds and provide a reference for exploration of component-, phase- and morphology-dependent upconversion luminescence properties.

Download Full-text