Synthesis and characterization of luminescent Ln3+ (Ln = Eu, Tb and Dy)-doped LiYF4 microcrystals produced by a facile microwave-assisted hydrothermal method

Andrade, Adriano B.; Bispo, Giordano Frederico da Cunha; Macedo, Zélia Soares; Valério, Mário E.G.

doi:10.1016/j.jlumin.2019.116843

Cited by 9 publications

(3 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These two doublets are ascribed to the metallic Y−O bonds, which confirmed that Y ions exhibited +3 oxidation state in Y-doped ZnO. 34,35 The two peaks for O 1s are assigned to Y−O−Y (530.8 eV) and Y− O−Zn (531.5 eV), respectively 36 (Figure 3(d)). The Zn−OH bonding and CO bonding formed due to the surfaceadsorbed histidine molecules.…”

Section: ■ Results and Discussionmentioning

confidence: 60%

Y-ZnO Microflowers Embedded Polymeric Composite Films to Enhance the Electrical Performance of Piezo/Tribo Hybrid Nanogenerators for Biomechanical Energy Harvesting and Sensing Applications

Patnam

Graham

2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Nowadays, hybrid nanogenerators (HNGs) have attracted much interest in mechanical energy-harvesting technology because of their assertable advantages in self-powered portable electronic devices. However, the HNG output performance is highly dependent on the active material, the structure of the device, the applied mechanical pressure, and so forth. In this regard, to develop a high-performance HNG, yttrium (Y)-doped zinc oxide (ZnO) microflowers (Y-ZnO MFs) were synthesized and embedded into polydimethylsiloxane (PDMS) for developing rationally designed composite films. Unlike the previously reported ZnO HNGs, the synthesized Y-ZnO MFs/PDMS-based HNG exhibits an improved electrical output because of the enhanced ferroelectricity of Y-ZnO MFs and the resultant increase of the charge density in the composite films. In addition, the effects of Y concentration on ZnO MFs and Y-ZnO MFs loaded into PDMS on the output performance of Y-ZnO MFs/PDMS HNG were studied systematically, and the optimized Y dopant concentration in ZnO MFs was found. Thus, the 0.5 mol % of Y-ZnO MFs and the 2.5 wt % of Y-ZnO MFs embedded in PDMS achieved a stable and enhanced performance. The obtained voltage (V OC ), current (I SC ), and instantaneous power density of the composite film-based HNG (Y-ZnO MFs/PDMS) were 247 V, 7 μA, and ∼6 W/m 2 , respectively. Furthermore, the practical and commercial applications of the proposed HNG were demonstrated by sensing and harvesting biomechanical motions available in everyday human activities and powering various portable electronics.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 60%

Y-ZnO Microflowers Embedded Polymeric Composite Films to Enhance the Electrical Performance of Piezo/Tribo Hybrid Nanogenerators for Biomechanical Energy Harvesting and Sensing Applications

Patnam

Graham

2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…The parity-allowed (f-d) electronic transition in Ce 3+ and Eu 2+ ions results in high-intensity emissions with short excited-state lifetimes (µs-ns). However, other examples can be easily found in trivalent rare earths, Eu 3+ , Tb 3+ , Pr 3+ , Dy 3+ , and d-metals (Mn 4+ ) doped materials [5,7,[41][42][43][44]. PeL materials are in evidence nowadays due to vast and unexplored bioimaging applications [37], theranostics [45], and photocatalysis [46].…”

Section: Concepts and Mechanisms Of Microwave Heatingmentioning

confidence: 99%

Microwave-Assisted Preparation of Luminescent Inorganic Materials: A Fast Route to Light Conversion and Storage Phosphors

et al. 2021

View full text Add to dashboard Cite

Luminescent inorganic materials are used in several technological applications such as light-emitting displays, white LEDs for illumination, bioimaging, and photodynamic therapy. Usually, inorganic phosphors (e.g., complex oxides, silicates) need high temperatures and, in some cases, specific atmospheres to be formed or to obtain a homogeneous composition. Low ionic diffusion and high melting points of the precursors lead to long processing times in these solid-state syntheses with a cost in energy consumption when conventional heating methods are applied. Microwave-assisted synthesis relies on selective, volumetric heating attributed to the electromagnetic radiation interaction with the matter. The microwave heating allows for rapid heating rates and small temperature gradients yielding homogeneous, well-formed materials swiftly. Luminescent inorganic materials can benefit significantly from the microwave-assisted synthesis for high homogeneity, diverse morphology, and rapid screening of different compositions. The rapid screening allows for fast material investigation, whereas the benefits of enhanced homogeneity include improvement in the optical properties such as quantum yields and storage capacity.

show abstract

“…Among the synthesis methods reported so far, there are thermal decomposition methods that use precise control of the synthesis environment and process, 12,13 two-step synthesis methods that use stepwise regulation of the synthesis of YF 3 and then LiYF 4 , 14 and improved methods that use special high-pressure steel kettles or rely on high-temperature tube furnaces. 15 In general, the synthesis process is more tedious and technically demanding than for other fluorides, limiting its application to rare-earth-doped luminescence and contactless temperature sensing.…”

Section: Introductionmentioning

confidence: 99%

A latest-generation fluoride with excellent structural stiffness for ultra-efficient photoluminescence and specific four-peak emission temperature sensing

Li,

Dai,

et al. 2024

Inorg. Chem. Front.

View full text Add to dashboard Cite

show abstract

Synthesis and characterization of luminescent Ln3+ (Ln = Eu, Tb and Dy)-doped LiYF4 microcrystals produced by a facile microwave-assisted hydrothermal method

Cited by 9 publications

References 50 publications

Y-ZnO Microflowers Embedded Polymeric Composite Films to Enhance the Electrical Performance of Piezo/Tribo Hybrid Nanogenerators for Biomechanical Energy Harvesting and Sensing Applications

Y-ZnO Microflowers Embedded Polymeric Composite Films to Enhance the Electrical Performance of Piezo/Tribo Hybrid Nanogenerators for Biomechanical Energy Harvesting and Sensing Applications

Microwave-Assisted Preparation of Luminescent Inorganic Materials: A Fast Route to Light Conversion and Storage Phosphors

A latest-generation fluoride with excellent structural stiffness for ultra-efficient photoluminescence and specific four-peak emission temperature sensing

Contact Info

Product

Resources

About