Determination of the absolute quantum efficiency of luminescence of solid materials employing photoacoustic spectroscopy

Adams, M. J.; Highfield, James; Kirkbright, G. F.

doi:10.1021/ac50058a024

Cited by 79 publications

(26 citation statements)

References 21 publications

(4 reference statements)

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“…20p), when the PA amplitude is independent of the sample's absorption coefficient, Adams and co-workers proposed a method to measure the absolute luminescence quantum yield by PA amplitude spectra. [47] The method is based on the fact that the efficiency factor, which converts absorbed power into heat by nonradiative relaxation, varies at different incident wavelengths, resulting in a corresponding variation of PA amplitudes. Overall quantum yields for EuA C H T U N G T R E N N U N G (tta) 3 L 2 at different temperatures are determined from PA amplitude in the 330-400 nm region at a modulation frequency of 33 Hz.…”

Section: Resultsmentioning

confidence: 99%

“…Both the PA phase and amplitude signals were normalized by use of the carbon black reference. Overall quantum yields of EuA C H T U N G T R E N N U N G (tta) 3 L 2 at different temperatures are determined from [47] where A is the PA amplitude at wavelength l 0 , K is a constant representing the thermal properties of the sample and the instrumental arrangement employed, l F is the mean frequency of the luminescence radiation (l F ¼ R I l Á ldl= R I l dl, where I l is the emission intensity at wavelength l) and f tal is the luminescence quantum yield. The subscripts F and NF refer to the luminescence sample and carbon black reference, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

Yang

Liu

et al. 2008

ChemPhysChem

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The photophysical properties of lanthanide complexes have been studied extensively; however, fundamental parameters such as the intrinsic quantum yield as well as radiative and nonradiative decay rates are difficult or even impossible to measure experimentally. Herein, a photoacoustic (PA) method is proposed to determine the intrinsic quantum yield of lanthanide complexes with lifetimes in the order of milliseconds. This method is used to determine the intrinsic quantum yields for europium(III)‐containing metallomesogens as well as terbium(III) complexes. The results show that the PA signal is sensitive to both the lifetime and the ratio of the fast‐to‐slow heat component of the samples. It is found that there is an efficient ligand sensitization and a moderate intrinsic quantum yield for the complexes. The intrinsic quantum yield of Eu3+ in the metallomesogens exhibits an obvious increase upon the isotropic liquid to smectic A transition. The proposed PA method is quite simple, and can contribute to a clearer understanding of the photophysical processes in luminescent lanthanide complexes.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

Yang

Liu

et al. 2008

ChemPhysChem

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“…It is also a known fact that the absorption coefficients measured for the same tissue are different in vitro and in vivo [20]. Besides of the concentration, a strong effect on the optical properties of blood arises from the shape, the velocity, aggregation and sedimentation of the erythrocytes [21].…”

Section: Resultsmentioning

confidence: 99%

Photoacoustic response of a common starfish tissue

Guskos¹,

Majszczyk²,

Typek³

et al. 2013

Ukr. J. Phys. Opt.

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Abstract.A sample of common starfish (Asterias Rubens) tissue has been prepared in the shape of a film to study its photoacoustic (PA) response. A broad absorption band in the PA spectrum is detected in the visible region (a peak at about 570 nm), while the ultraviolet region is distinguished by the absorption bands originating from π → π* and π → n charge transfer transitions. The visible PA spectrum strongly depends on decomposition of sample in the open air. The PA spectrum measured by us is very similar to those obtained earlier for the other living organisms, e.g. Trunculariopis Trunculus and Sea Urchin. The absorption band near 570 nm is similar to that found for spermidine, which is of importance in the information transfer to DNA. The results obtained in this work confirm experimentally that geologically very old organisms have been absorbing especially intensely in that part of solar spectrum for which the water is transparent.

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“…The PA signal is obtained by detecting the heat generated through non-radiative transitions by the sample after absorbing a periodically varying incident light [7][8][9]. The PA spectra of the silica samples are shown in Fig.…”

Section: Pa and Luminescence Spectramentioning

confidence: 99%

“…It is found that A was proportional to ω −1 . It means that PA saturation occurs and A is independent of the sample's absorption coefficient [8]. As the thermal properties of the samples are basically the same, A is proportional to the probability of non-radiative transitions of the samples.…”

Section: Pa and Luminescence Spectramentioning

confidence: 99%

Photoacoustic Study on the Co-luminescence Effect of Lanthanide Complexes with Aromatic Acid in Silica Gels

Yang

Liu

et al. 2012

Int J Thermophys

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In this study, lanthanide complexes Tb(o-HBA) 3 ·H 2 O and Ln(o-HBA) 3 · H 2 O (o-HBA: o-hydroxy benzoic acid; Ln 3+ :Y 3+ or Er 3+ ) co-doped silica samples have been prepared via a sol-gel method. The photoacoustic (PA) intensity of the ligand decreases with the addition of the Y 3+ complex, and increases remarkably with the addition of the Er 3+ complex. Different PA intensities of the samples are interpreted by comparison with their luminescence spectra. The luminescence quantum yields, which are accurate within 10 %, have been determined to be 26 %, 22 %, and 6.9 % for the silica samples doped with Tb 3+ -Y 3+ complexes, Tb 3+ complex, and Tb 3+ -Er 3+ complexes, respectively. A possible mechanism for the co-luminescence phenomena is proposed.

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Determination of the absolute quantum efficiency of luminescence of solid materials employing photoacoustic spectroscopy

Cited by 79 publications

References 21 publications

Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

Photoacoustic response of a common starfish tissue

Photoacoustic Study on the Co-luminescence Effect of Lanthanide Complexes with Aromatic Acid in Silica Gels

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