Investigation of tribological behavior of lanthanum hybrid polyelectrolyte molecular deposition films

Guo, Yanbao; Wang, Deguo; Liu, Shuhai; Zhang, Siwei

doi:10.1016/j.surfcoat.2010.10.069

Cited by 6 publications

(3 citation statements)

References 38 publications

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“…In this case, the absorption increase is mainly ascribed to light scattering by the phosphor particles. 55,56 The absorbance of the films at 600 nm reveals a linear increase up to the PMMA:2Eu-2h film, and then tends to a saturation regime at larger phosphor content, suggesting that the phosphor dispersion is homogeneous until the PMMA:2Eu-2h. As the phosphor particles are micro-sized (diameter of 1 μm), 26 it is expected that the precursor suspension becomes unstable as the phosphor amount increases, leading to a non-homogeneous deposition of the particles.…”

Section: Resultsmentioning

confidence: 99%

Red-Emitting Coatings for Multifunctional UV/Red Emitting LEDs Applied in Plant Circadian Rhythm Control

Bispo

Lima

Carlos

et al. 2019

ECS J. Solid State Sci. Technol.

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Multifunctional light-emitting diodes (LEDs) formed by coating deep-UV-emitting (<300 nm) LED chips with downshifting phosphors are of great interest for applications in indoor farms as both antibacterial (UV radiation) and photosynthetic agent (red light). Challenges include the fabrication of high-brightness downshifting converter films with controlled thickness excited in the deep-UV spectral region. We address it by optimizing the amount of Ba2SiO4:Eu(III) red-emitting phosphor dispersed in poly (methyl)methacrylate (PMMA), yielding luminescent films with tunable thickness. Taking advantage of the intra-4f6 transitions, the Eu(III) luminescence is used as local probe, pointing out the presence of 8 non-equivalent local sites for the lanthanides. PMMA enables the processing of flexible films and simultaneously acts as a selective filter to deep-UV radiation, controlling the amount of UV radiation for indoor farm applications. Moreover, after the dispersion in PMMA, the Eu(III)-based luminescence remains analogous to that of the isolated phosphor with an absolute emission quantum yield of 0.11 ± 0.01, confirming that Ba2SiO4:Eu(III)/PMMA films display desirable features to be used as coatings of deep-UV emitting LEDs toward multifunctional devices for indoor farm application.

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Section: Resultsmentioning

confidence: 99%

Red-Emitting Coatings for Multifunctional UV/Red Emitting LEDs Applied in Plant Circadian Rhythm Control

Bispo

Lima

Carlos

et al. 2019

ECS J. Solid State Sci. Technol.

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“…Over the years, rare earths (REs) have aroused much interest and been widely used in many fields, such as optics, medicine, chemistry and magnetic, etc. [22][23][24][25][26][27]. Moreover, REs exhibit strong chemical activity due to its special structure of the 4f electron shell (----4f 0~14 ) [28].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, REs exhibit strong chemical activity due to its special structure of the 4f electron shell (----4f 0~14 ) [28]. According to reported references, RE elements generally used as lubricants, which shows good friction-reducing and wear-resistance behaviors [24,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Lanthanum Treated Carboxyl-Graphene Oxide Self-Assembled Composite Film on Silicon Substrate

Shu

Gao

Zhang

2016

KEM

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The admixture of graphene oxide (GO) sheets and chloroacetic acid were ultrasonic treated. As a result, epoxy and hydroxyl groups which existed onto GO sheets were transformed into carboxyl groups. Then, the carboxyl-GO sheets were assembled on silicon substrate by taking use of 3-aminopropyltriethoxysilane (APS) as an intermediate coupling agent (marked as APS-GO). Furthermore, La elements were deposited on the APS-GO by means of chemisorption to form multilayer film (APS-GO-La). Chemical compositions, surface morphologies, and microstructures were investigated by using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and water contact angle (WCA). Experimental results suggested that carboxyl-GO sheets distributed homogeneously on Si substrate. Results also indicated that lanthanum elements can react with the-COOH functional groups of GO film and be adsorbed on the APS-GO film surface. The prepared APS-GO-La multilayer film showed low surface free energy, which has potential applications in nano/micro electro-mechanical systems (N/MEMS).

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Nanostructured hybrid films containing nanophosphor: Fabrication and electronic spectral properties

Camacho

Aoki

Constantino

et al. 2012

Journal of Alloys and Compounds

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Investigation of tribological behavior of lanthanum hybrid polyelectrolyte molecular deposition films

Cited by 6 publications

References 38 publications

Red-Emitting Coatings for Multifunctional UV/Red Emitting LEDs Applied in Plant Circadian Rhythm Control

Red-Emitting Coatings for Multifunctional UV/Red Emitting LEDs Applied in Plant Circadian Rhythm Control

Fabrication and Characterization of Lanthanum Treated Carboxyl-Graphene Oxide Self-Assembled Composite Film on Silicon Substrate

Nanostructured hybrid films containing nanophosphor: Fabrication and electronic spectral properties

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