Abstract:Europium, terbium, dysprosium, and samarium are the main trivalent lanthanide ions emitting in the visible spectrum. In this work, the potential of these ions for colorimetric applications and colour reproduction was studied. The conversion of spectral data to colour coordinates was undertaken for three sets of Ln complexes composed of different ligands. We showed that Eu is the most sensitive of the visible Ln ions, regarding ligand-induced colour shifts, due to its hypersensitive transition. Further investig… Show more
“…Figure 4 represents the CIE diagram of Y 2 Sn 2 O 7 :x%Eu (x = 7, 8, 9, 10) nanophosphors. The CIE color coordinates of all the pyrochlore phosphors lie in the range (0.64 ± 0.02, 0.36 ± 0.02), which is very close to that of the ideal red light (0.67, 0.33) [ 31 , 32 ].…”
Undoped Y2Sn2O7 and Eu3+ doped Y2Sn2O7 samples with doping concentrations 7%, 8%, 9%, and 10% are successfully synthesized by the co-precipitation method. A complete structural, morphological, and spectroscopic characterization is carried out. XRD measurements reveal that samples crystallize in the pure single pyrochlore phase and Eu3+ ions occupy sites with D3d symmetry. After mechanical grinding, the average crystallite size is less than 100 nm for all compositions. Optical characterization shows emission from the 5D0 level towards the lower lying 7F0,1,2,3,4 levels. The CIE color coordinates of all the pyrochlore phosphors are very close to those of the ideal red light. For the visualization of latent fingerprints, different surfaces are tested, including difficult ones (wood and ceramic), with excellent results. All three levels of fingerprint ridge patterns are visualized: core (Level 1), bifurcation and termination (Level 2), and sweat pores (Level 3). Moreover, our nano-powders are used to prepare a stable fluorescent ink.
“…Figure 4 represents the CIE diagram of Y 2 Sn 2 O 7 :x%Eu (x = 7, 8, 9, 10) nanophosphors. The CIE color coordinates of all the pyrochlore phosphors lie in the range (0.64 ± 0.02, 0.36 ± 0.02), which is very close to that of the ideal red light (0.67, 0.33) [ 31 , 32 ].…”
Undoped Y2Sn2O7 and Eu3+ doped Y2Sn2O7 samples with doping concentrations 7%, 8%, 9%, and 10% are successfully synthesized by the co-precipitation method. A complete structural, morphological, and spectroscopic characterization is carried out. XRD measurements reveal that samples crystallize in the pure single pyrochlore phase and Eu3+ ions occupy sites with D3d symmetry. After mechanical grinding, the average crystallite size is less than 100 nm for all compositions. Optical characterization shows emission from the 5D0 level towards the lower lying 7F0,1,2,3,4 levels. The CIE color coordinates of all the pyrochlore phosphors are very close to those of the ideal red light. For the visualization of latent fingerprints, different surfaces are tested, including difficult ones (wood and ceramic), with excellent results. All three levels of fingerprint ridge patterns are visualized: core (Level 1), bifurcation and termination (Level 2), and sweat pores (Level 3). Moreover, our nano-powders are used to prepare a stable fluorescent ink.
“…1 Trivalent europium is well known for its strong red emission with the strongest emission peaks located around 620 and 700 nm, while Tb 3+ shows an intense green emission around 545 nm and also a weak blue emission at 490 nm. 8 Hence, these two Ln 3+ species have been combined with a blue emitting lanthanide such as Ce 3+ , Eu 2+ , Dy 3+ , and Tm 3+ . [9][10][11] Blue emitters can also be used in combination with yellow or orange colour emitters such as Ce 3+ or Sm 3+ .…”
Precisely composition-tuned white-light-emissive lanthanide-organic thin films are fabricated using the combined atomic/molecular layer deposition (ALD/MLD) technique. The emission colour characteristics are comparable (and even exceeding) those measured for commercial incandescent...
“…From an optical point of view, it is widely known that lanthanides exhibit sharp absorption bands with unique well-defined optical emissions in the NIR-UV-Vis range, long-lived excited state lifetimes and remarkable photostability [81,82]. Furthermore, lanthanide ions, such as Gd 3+ , Dy 3+ and Ho 3+ , possess specific chemical properties in terms of high effective magnetic moment and variable electronic relaxation times, which make them suitable for bioimaging [83][84][85][86] and electronic applications [87][88][89][90][91][92].…”
In this study, novel lanthanide-containing double-decker polyhedral oligomeric silsesquioxanes (POSS) were prepared by combining the partially condensed TetraSilanolPhenyl POSS with terbium (Tb3+) and europium (Eu3+) ions. This open-cage POSS possesses four diametrically opposite silanol groups that are able to coordinate, under mild conditions, different luminescent ions through a simple corner-capping method. The two metal-containing POSS functionalized with Tb3+ and with an equimolar combination of Tb3+ and Eu3+ show a completely condensed structure with different luminescent properties. Their emission features depend on the chemical nature of the metal ions incorporated in the framework. An improved stokes shift was detected in the bimetallic compound containing both the Tb3+ and Eu3+ ions, promoted by the occurrence of a Tb3+→Eu3+ energy transfer mechanism. These characteristics identify this metal-functionalized silica platform as a potential candidate for the development of novel luminescent devices.
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