An accurate digital instrument for the measurement of circular polarisation of luminescence

Schippers, P. H.; Buekel, A van den; Dekkers, Harry P. J. M.

doi:10.1088/0022-3735/15/9/022

Cited by 33 publications

(24 citation statements)

References 16 publications

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“…It should be emphasized that plotting g lum ( t ) is merely a convenient way to represent the difference and trends in the decay curves of the two polarizations and does not bear an important physical significance on its own. As observed in Figure 3d, g lum ( t ) starts at ~−0.8, at t ≈ 0, in agreement with the value of the steady‐state g lum of the 595‐nm line of Eu(facam) 3 , −0.78 16 . A significant change is observed in g lum ( t ), decreasing in a roughly linear fashion with time toward zero with a time constant on the order of 1 ms, which is longer than the average emission lifetime.…”

Section: Resultssupporting

confidence: 85%

“…As observed in Figure 3d, g lum (t) starts at $−0.8, at t ≈ 0, in agreement with the value of the steady-state g lum of the 595-nm line of Eu(facam) 3 , −0.78. 16 A significant change is observed in g lum (t), decreasing in a roughly linear fashion with time toward zero with a time constant on the order of 1 ms, which is longer than the average emission lifetime. Thus, the plot of g lum (t) might indicate that the heterogeneity of the emitting species is expressed mostly at the tail of the emission decay.…”

Section: Resultsmentioning

confidence: 93%

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Time‐resolved circularly polarized luminescence of Eu³⁺‐based systems

et al. 2020

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Chiral Eu3+‐based systems are frequently studied via circularly polarized luminescence spectroscopy. The emission lifetimes of each circular polarization, however, are virtually always ignored, because in a homogeneous sample of emitters, there should be no difference between the two. However, we show that in less robust Eu3+ complex structures, as in the chiral complex Eu (facam)3, a difference in the lifetimes of the two circularly polarized emission components arises due to heterogeneity of the complexes. In this case, each species within the sample could have different degrees of circularly polarized luminescence and decay rates at certain emission lines. The superposition of the emission components of the various chiral species leads to an overall difference in decay rate between the two circular polarizations. Such a difference is also shown for Eu3+‐doped chiral TbPO4·D2O nanocrystals. We believe that this kind of measurement could be a unique tool for determining the homogeneity of a lanthanide‐based chiral system, where other methods might fail in this task.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 93%

Time‐resolved circularly polarized luminescence of Eu³⁺‐based systems

et al. 2020

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“…The signals correspond to the observed CPL and total luminescence intensities, respectively. The calibration factor for the system, F, was determined using a standard of the g em value ( g em =−0.78 at 595.2 nm) of tris(3‐trifluoroacetyl‐(+)‐camphorato)europium(III), [Eu((+)‐facam) 3 ], in dry DMSO . The slit width of the monochromator was set as narrow as possible in the measurement of the standard Eu III sample.…”

Section: Methodsmentioning

confidence: 99%

Circularly Polarized Luminescence of Chiral Pt(pppb)Cl (pppbH=1‐pyridyl‐3‐(4,5‐pinenopyridyl)benzene) Aggregate in the Excited State

Tanaka

Sato

Ichida

et al. 2015

Chemistry An Asian Journal

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We prepared enantiomers of chiral Pt(II) complexes, Pt(pppb)Cl and Pt(pppb)CN (pppbH=1-pyridyl-3-(4,5-pinenopyridyl)benzene), and measured their CPL (circularly polarized luminescence) spectra for excimer and trimer emission. The contribution of the pinene moiety to CPL was considerably low for the π-π* emission of the monomer but large for MMLCT (metal-metal-to-ligand charge-transfer) of the excimer and trimer which had a helical structure induced in a face-to-face stacking fashion. The trimer CPL for (+)-Pt(pppb)Cl was larger in intensity than that of excimer CPL; on the other hand, that for (+)-Pt(pppb)CN was opposite in sign compared with that of excimer CPL. We conclude that differences in the excited-state structure of the aggregate between Pt(pppb)Cl and Pt(pppb)CN account for the variation in the CPL spectra. By the aid of TD-DFT calculations it was predicted that the dihedral angle θ(Cl-Pt-Pt-Cl) was 50-60° or 110-140° for Pt(pppb)Cl aggregates and 160° for Pt(pppb)CN aggregates.

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“…Tris europium trifluoromethylcamphorate (Eu(facam) 3 , facam = L 7 ; Scheme 4) in dimethylsulphoxide displays a g lum of |0.78| 41 and it is used as a standard for CPL instruments calibration, 42 even though this practice has been recently criticized and other systems have been proposed. 43 Recently, Eu(facam) 3 complexes with several ancillary ligands have been synthesized and their CPL measured in solution.…”

Section: Camphor-based Systemsmentioning

confidence: 99%

Lanthanide Circularly Polarized Luminescence: Bases and Applications

2014

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Lanthanide (III) luminescence is very characteristic: it is characterized by narrow emission bands, large Stokes shift, and a long excited state lifetime. Moreover, chiral lanthanide complexes can emit strongly circularly polarized light in a way that is almost precluded to purely organic molecules. Thanks to the sensitivity and specificity of the Ln circularly polarized luminescence (CPL) signal, CPL-active complexes are therefore employed as bioanalytical tools and other uses can be envisaged in many other fields. Here we present a brief overview of the most recently developed CPL-active lanthanide complexes and a selected few examples of their applications. We briefly discuss the main mechanisms that can rationalize the observed outstanding CPL properties of these systems, and some practical suggestions on how to measure and report data.

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An accurate digital instrument for the measurement of circular polarisation of luminescence

Cited by 33 publications

References 16 publications

Time‐resolved circularly polarized luminescence of Eu³⁺‐based systems

Time‐resolved circularly polarized luminescence of Eu³⁺‐based systems

Circularly Polarized Luminescence of Chiral Pt(pppb)Cl (pppbH=1‐pyridyl‐3‐(4,5‐pinenopyridyl)benzene) Aggregate in the Excited State

Lanthanide Circularly Polarized Luminescence: Bases and Applications

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An accurate digital instrument for the measurement of circular polarisation of luminescence

Cited by 33 publications

References 16 publications

Time‐resolved circularly polarized luminescence of Eu3+‐based systems

Time‐resolved circularly polarized luminescence of Eu3+‐based systems

Circularly Polarized Luminescence of Chiral Pt(pppb)Cl (pppbH=1‐pyridyl‐3‐(4,5‐pinenopyridyl)benzene) Aggregate in the Excited State

Lanthanide Circularly Polarized Luminescence: Bases and Applications

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Time‐resolved circularly polarized luminescence of Eu³⁺‐based systems

Time‐resolved circularly polarized luminescence of Eu³⁺‐based systems