Time-Resolved Photoluminescence Excitation Characterisation of Lanthanide and Group III <I>tris</I>-(8-hydroxyquinoline) Molecules

Pratik DESAI; Martin SOMERTON; Richard J. CURRY; William P. GILLIN

Time-Resolved Photoluminescence Excitation Characterisation of Lanthanide and Group III tris-(8-hydroxyquinoline) Molecules

Pratik DESAI, Martin SOMERTON, Richard J. CURRY, William P. GILLIN

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Time resolved photoluminescence measurements of lanthanide and group III metal chelates of 8-hydroxyquinoline (Q) have been performed as a function of temperature and excitation wavelength. For the lanthanide complexes it has been shown that either singlet or triplet luminescence can be observed depending on the excitation wavelength. Lifetime measurements of these emissions show that competing non-radiative paths are very important in the performance of these molecules. For ErQ we have shown that it is the singlet state that couples most efficiently to the ion. Radiative lifetime measurements of the ion emission show relatively short lifetimes that are indicative of quenching mechanisms. For the group III metal chelates at room temperature the luminescence is dominated by the singlet emission but at 80 K there is evidence that triplet emission can occur when the molecule is excited at long wavelengths. Luminescence lifetime measurements of the emission from the lanthanide ions: erbium, neodymium and ytterbium all show effective lifetimes of the order of microseconds which is very fast compared to the lifetimes of the free ions. Using excitation directly into the lanthanide ion (e.g.980 nm excitation for erbium) and via the organic ligands (400 nm excitation) we have seen that there are no changes in the emission lifetimes and hence the exciton transfer from the ligand to the lanthanide ion is not a rate limiting step.

Publication: IEICE TRANSACTIONS on Electronics Vol.E87-C No.12 pp.2023-2027

Publication Date: 2004/12/01

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Type of Manuscript: Special Section INVITED PAPER (Special Section on Recent Progress in Organic Molecular Electronics)

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Pratik DESAI, Martin SOMERTON, Richard J. CURRY, William P. GILLIN, "Time-Resolved Photoluminescence Excitation Characterisation of Lanthanide and Group III tris-(8-hydroxyquinoline) Molecules" in IEICE TRANSACTIONS on Electronics, vol. E87-C, no. 12, pp. 2023-2027, December 2004, doi: .
Abstract: Time resolved photoluminescence measurements of lanthanide and group III metal chelates of 8-hydroxyquinoline (Q) have been performed as a function of temperature and excitation wavelength. For the lanthanide complexes it has been shown that either singlet or triplet luminescence can be observed depending on the excitation wavelength. Lifetime measurements of these emissions show that competing non-radiative paths are very important in the performance of these molecules. For ErQ we have shown that it is the singlet state that couples most efficiently to the ion. Radiative lifetime measurements of the ion emission show relatively short lifetimes that are indicative of quenching mechanisms. For the group III metal chelates at room temperature the luminescence is dominated by the singlet emission but at 80 K there is evidence that triplet emission can occur when the molecule is excited at long wavelengths. Luminescence lifetime measurements of the emission from the lanthanide ions: erbium, neodymium and ytterbium all show effective lifetimes of the order of microseconds which is very fast compared to the lifetimes of the free ions. Using excitation directly into the lanthanide ion (e.g.980 nm excitation for erbium) and via the organic ligands (400 nm excitation) we have seen that there are no changes in the emission lifetimes and hence the exciton transfer from the ligand to the lanthanide ion is not a rate limiting step.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e87-c_12_2023/_p

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@ARTICLE{e87-c_12_2023,
author={Pratik DESAI, Martin SOMERTON, Richard J. CURRY, William P. GILLIN, },
journal={IEICE TRANSACTIONS on Electronics},
title={Time-Resolved Photoluminescence Excitation Characterisation of Lanthanide and Group III tris-(8-hydroxyquinoline) Molecules},
year={2004},
volume={E87-C},
number={12},
pages={2023-2027},
abstract={Time resolved photoluminescence measurements of lanthanide and group III metal chelates of 8-hydroxyquinoline (Q) have been performed as a function of temperature and excitation wavelength. For the lanthanide complexes it has been shown that either singlet or triplet luminescence can be observed depending on the excitation wavelength. Lifetime measurements of these emissions show that competing non-radiative paths are very important in the performance of these molecules. For ErQ we have shown that it is the singlet state that couples most efficiently to the ion. Radiative lifetime measurements of the ion emission show relatively short lifetimes that are indicative of quenching mechanisms. For the group III metal chelates at room temperature the luminescence is dominated by the singlet emission but at 80 K there is evidence that triplet emission can occur when the molecule is excited at long wavelengths. Luminescence lifetime measurements of the emission from the lanthanide ions: erbium, neodymium and ytterbium all show effective lifetimes of the order of microseconds which is very fast compared to the lifetimes of the free ions. Using excitation directly into the lanthanide ion (e.g.980 nm excitation for erbium) and via the organic ligands (400 nm excitation) we have seen that there are no changes in the emission lifetimes and hence the exciton transfer from the ligand to the lanthanide ion is not a rate limiting step.},
keywords={},
doi={},
ISSN={},
month={December},}

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TY - JOUR
TI - Time-Resolved Photoluminescence Excitation Characterisation of Lanthanide and Group III tris-(8-hydroxyquinoline) Molecules
T2 - IEICE TRANSACTIONS on Electronics
SP - 2023
EP - 2027
AU - Pratik DESAI
AU - Martin SOMERTON
AU - Richard J. CURRY
AU - William P. GILLIN
PY - 2004
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E87-C
IS - 12
JA - IEICE TRANSACTIONS on Electronics
Y1 - December 2004
AB - Time resolved photoluminescence measurements of lanthanide and group III metal chelates of 8-hydroxyquinoline (Q) have been performed as a function of temperature and excitation wavelength. For the lanthanide complexes it has been shown that either singlet or triplet luminescence can be observed depending on the excitation wavelength. Lifetime measurements of these emissions show that competing non-radiative paths are very important in the performance of these molecules. For ErQ we have shown that it is the singlet state that couples most efficiently to the ion. Radiative lifetime measurements of the ion emission show relatively short lifetimes that are indicative of quenching mechanisms. For the group III metal chelates at room temperature the luminescence is dominated by the singlet emission but at 80 K there is evidence that triplet emission can occur when the molecule is excited at long wavelengths. Luminescence lifetime measurements of the emission from the lanthanide ions: erbium, neodymium and ytterbium all show effective lifetimes of the order of microseconds which is very fast compared to the lifetimes of the free ions. Using excitation directly into the lanthanide ion (e.g.980 nm excitation for erbium) and via the organic ligands (400 nm excitation) we have seen that there are no changes in the emission lifetimes and hence the exciton transfer from the ligand to the lanthanide ion is not a rate limiting step.
ER -