Ce3+ sensitized bright white light emission from colloidal Ln3+ doped CaF2 nanocrystals for the development of transparent nanocomposites

Adusumalli, Venkata N. K. B.; Koppisetti, Heramba V. S. R. M.; Mahalingam, Venkataramanan

doi:10.1039/c6tc00756b

Cited by 26 publications

(18 citation statements)

References 74 publications

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“…The UV curve shows the polymer E covers the range 250–600 nm, whereas the emission spectrum covered the range for red, green, and blue (RGB; Figure a, b). To value the white colour and emissive properties, Commission International de l′Eclairage (CIE) chromaticity coordinates ( x , y ) were calculated . The colour coordinates were 0.34 and 0.37, falling in range of white light CIE coordinates ( x= 0.33, y= 0.33).…”

Section: Resultsmentioning

confidence: 99%

“Dial‐In” Emission from a Unique Flexible Material with Polarization Tuneable Spectral Intensity

Kumar

Ray

Mukherjee

et al. 2019

Chemistry A European J

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The development of organic photoluminescent materials, which show promising roles as catalysts, sensors, organic light‐emitting diodes, logic gates, etc., is a major demand and challenge for the global scientific community. In this context, a photoclick polymerization method is adopted for the growth of a unique photoluminescent three‐dimensional (3D) polymer film, E, as a model system that shows emission tunability over the range 350–650 nm against the excitation range 295–425 nm. The DFT analysis of energy calculations and π‐stacking supports the spectroscopic observations for the material exhibiting a broad range of emission owing to newly formed chromophoric units within the film. Full polarization spectroscopic Mueller matrix studies were employed to extract and quantify the molecular orientational order of both the ground (excitation) and excited (emission) state anisotropies through a set of newly defined parameters, namely the fluorescence diattenuation and fluorescence polarizance. The information contained in the recorded fluorescence Mueller matrix of the organic polymer material provided a useful way to control the spectral intensity of emission by using pre‐ and post‐selection of polarization states. The observation was based on the assumption that the longer lifetime of the excited dipolar orientation is attributed to the compactness of the film.

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Section: Resultsmentioning

confidence: 99%

“Dial‐In” Emission from a Unique Flexible Material with Polarization Tuneable Spectral Intensity

Kumar

Ray

Mukherjee

et al. 2019

Chemistry A European J

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“…This results in white-light emission originating from the combination of blue, green, and red emission from Tm 3+ , Tb 3+ , and Sm 3+ ions, respectively (as shown in Figure 5). 43 In another study, we have replaced Tb 3+ and Sm 3+ with Mn 2+ ions to produce white-light emission in NaYF 4 nanocrystals. 44 Replacing Ln 3+ ions with transition-metal ions is cheaper because of their abundance.…”

Section: Strategies To Enhance the Luminescence Ofmentioning

confidence: 99%

Design of Lanthanide-Doped Colloidal Nanocrystals: Applications as Phosphors, Sensors, and Photocatalysts

et al. 2018

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The unique optical characteristics of lanthanides (Ln3+) like high colour purity, long excited state lifetimes, less perturbation of excited states by the crystal field environment and ability towards easy spectral conversion of wavelengths through upconversion and downconversion processes have caught the research attention of many scientists in the recent past. To broaden the scope of using these properties, it is important to make suitable Ln3+-doped materials, particularly in colloidal forms. In this feature article, we discuss the different synthetic strategies to make Ln3+-doped nanoparticles in colloidal forms, particularly on ways of functionalizing hydrophobic surfaces to hydrophilic ones for enhancing their dispersibility and luminescence in aqueous medium. We have enumerated the various strategies and sensitizers utilized to increase the luminescence of the nanoparticles. Further, the use of these colloidal nanoparticle systems in sensing application by appropriate selection of capping ligands has been discussed. In addition, we have shown how the energy transfer efficiency from Ce3+ to Ln3+ ions can be utilized for detection of toxic metal ions and small molecules. Finally, we discuss examples where the spectral conversion ability of these materials has been used in photocatalysis and solar cell applications.

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“…Hollow micro-and nanostructures with their unique properties, such as low density, high surface-to-volume ratio, low coefficient of thermal expansion, and low refractive index, have been applied in drug-delivery carriers, efficient catalysis, sensors, active-material encapsulation, photonic crystals, etc. [6,7]. Microstructured solid fluoride materials, due to their properties (lowenergy phonons, high ionicity, electron-acceptor behavior, high resistivity, and anionic conductivity), have been used in optical applications.…”

Section: Introductionmentioning

confidence: 99%

Green-emitting CaF₂:Ce³⁺,Tb³⁺ phosphor: selection for improving luminous flux and color quality of conformal geometry white LED lamps

Tin

Minh

Nhân

et al. 2018

Materials Science-Poland

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In the last decades, new solutions for improving lighting properties of white LED lamps (WLEDs) have been the main research direction in optoelectronics. In this paper, a modern approach for enhancing luminous flux and color quality of white LED lamps was presented. By mixing green-emitting CaF 2 :Ce 3+ ,Tb 3+ phosphor with yellow-emitting YAG:Ce phosphor compound, the luminous flux and color quality of white LED lamps with conformal phosphor geometry (CPG) increased significantly. From the obtained results it follows that, the luminous flux increased more than 1.5 times, and the correlated color temperature deviation decreased more than 4 times in comparison with the non-green-emitting CaF 2 :Ce 3+ ,Tb 3+ phosphor. The presented research shows that the green-emitting CaF 2 :Ce 3+ ,Tb 3+ phosphor could become a good candidate for enhancing luminous flux and color quality of white LED lamps.

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Ce³⁺ sensitized bright white light emission from colloidal Ln³⁺ doped CaF₂ nanocrystals for the development of transparent nanocomposites

Abstract: Intense white light emissions are observed from colloidal single component Ce3+/Ce3+/Ce3+/Ce3+-doped CaF2 nanocrystals and their transparent nanocomposites.

Cited by 26 publications

References 74 publications

“Dial‐In” Emission from a Unique Flexible Material with Polarization Tuneable Spectral Intensity

“Dial‐In” Emission from a Unique Flexible Material with Polarization Tuneable Spectral Intensity

Design of Lanthanide-Doped Colloidal Nanocrystals: Applications as Phosphors, Sensors, and Photocatalysts

Green-emitting CaF₂:Ce³⁺,Tb³⁺ phosphor: selection for improving luminous flux and color quality of conformal geometry white LED lamps

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Ce3+ sensitized bright white light emission from colloidal Ln3+ doped CaF2 nanocrystals for the development of transparent nanocomposites

Abstract: Intense white light emissions are observed from colloidal single component Ce3+/Ce3+/Ce3+/Ce3+-doped CaF2 nanocrystals and their transparent nanocomposites.

Cited by 26 publications

References 74 publications

“Dial‐In” Emission from a Unique Flexible Material with Polarization Tuneable Spectral Intensity

“Dial‐In” Emission from a Unique Flexible Material with Polarization Tuneable Spectral Intensity

Design of Lanthanide-Doped Colloidal Nanocrystals: Applications as Phosphors, Sensors, and Photocatalysts

Green-emitting CaF2:Ce3+,Tb3+ phosphor: selection for improving luminous flux and color quality of conformal geometry white LED lamps

Contact Info

Product

Resources

About

Ce³⁺ sensitized bright white light emission from colloidal Ln³⁺ doped CaF₂ nanocrystals for the development of transparent nanocomposites

Green-emitting CaF₂:Ce³⁺,Tb³⁺ phosphor: selection for improving luminous flux and color quality of conformal geometry white LED lamps