Charging and ultralong phosphorescence of lanthanide facilitated organic complex

Waygen Thor; Yue Wu; Lei Wang; Yonghong Zhang; Peter A. Tanner; Ka Leung Wong

doi:10.1038/s41467-021-26927-z

Charging and ultralong phosphorescence of lanthanide facilitated organic complex

Waygen Thor, Yue Wu, Lei Wang, Yonghong Zhang, Peter A. Tanner^*, Ka Leung Wong^*

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

14 Citations (Scopus)

Abstract

Emission from the triplet state of an organo-lanthanide complex is observed only when the energy transfer to the lanthanide ion is absent. The triplet state lifetime under cryogenic conditions for organo-lanthanide compounds usually ranges up to tens of milliseconds. The compound LaL1(TTA)₃ reported herein exhibits 77 K phosphorescence observable by the naked eye for up to 30 s. Optical spectroscopy, density functional theory (DFT) and time-dependent DFT techniques have been applied to investigate the photophysical processes of this compound. In particular, on-off continuous irradiation cycles reveal a charging behaviour of the emission which is associated with triplet-triplet absorption because it shows a shorter rise lifetime than the corresponding decay lifetime and it varies with illumination intensity. The discovery of the behaviour of this compound provides insight into important photophysical processes of the triplet state of organo-lanthanide systems and may open new fields of application such as data encryption, anti-counterfeiting and temperature switching.

Original language	English
Article number	6532
Number of pages	9
Journal	Nature Communications
Volume	12
DOIs	https://doi.org/10.1038/s41467-021-26927-z
Publication status	Published - 11 Nov 2021

Scopus Subject Areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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title = "Charging and ultralong phosphorescence of lanthanide facilitated organic complex",

abstract = "Emission from the triplet state of an organo-lanthanide complex is observed only when the energy transfer to the lanthanide ion is absent. The triplet state lifetime under cryogenic conditions for organo-lanthanide compounds usually ranges up to tens of milliseconds. The compound LaL1(TTA)3 reported herein exhibits 77 K phosphorescence observable by the naked eye for up to 30 s. Optical spectroscopy, density functional theory (DFT) and time-dependent DFT techniques have been applied to investigate the photophysical processes of this compound. In particular, on-off continuous irradiation cycles reveal a charging behaviour of the emission which is associated with triplet-triplet absorption because it shows a shorter rise lifetime than the corresponding decay lifetime and it varies with illumination intensity. The discovery of the behaviour of this compound provides insight into important photophysical processes of the triplet state of organo-lanthanide systems and may open new fields of application such as data encryption, anti-counterfeiting and temperature switching.",

author = "Waygen Thor and Yue Wu and Lei Wang and Yonghong Zhang and Tanner, {Peter A.} and Wong, {Ka Leung}",

note = "Funding Information: Financial assistance from the Hong Kong Research Grants Council Grant No. 12300021 and the Centre for Medical Engineering of Molecular and Biological Probes (AoE/M-401/20) is gratefully acknowledged (K.-L.W.). We thank the Max-Planck-Institut f{\"u} Chemische Ener-giekonversion for making available the Orca Program, and Mr. Karel Au is thanked for constructing a computer to run ORCA in the Linux platform. This research was conducted using also the resources of the High-Performance Cluster Computing Centre, Hong Kong Baptist University, which receives funding from the Research Grants Council, University Grant Committee of the HKSAR, and Hong Kong Baptist University. We thank Zhaolun Song of Maplesoft for useful suggestions and Sci-Hub in removing barriers in the way to science. Publisher Copyright: {\textcopyright} 2021, The Author(s).",

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AU - Wong, Ka Leung

N1 - Funding Information: Financial assistance from the Hong Kong Research Grants Council Grant No. 12300021 and the Centre for Medical Engineering of Molecular and Biological Probes (AoE/M-401/20) is gratefully acknowledged (K.-L.W.). We thank the Max-Planck-Institut fü Chemische Ener-giekonversion for making available the Orca Program, and Mr. Karel Au is thanked for constructing a computer to run ORCA in the Linux platform. This research was conducted using also the resources of the High-Performance Cluster Computing Centre, Hong Kong Baptist University, which receives funding from the Research Grants Council, University Grant Committee of the HKSAR, and Hong Kong Baptist University. We thank Zhaolun Song of Maplesoft for useful suggestions and Sci-Hub in removing barriers in the way to science. Publisher Copyright: © 2021, The Author(s).

PY - 2021/11/11

Y1 - 2021/11/11

N2 - Emission from the triplet state of an organo-lanthanide complex is observed only when the energy transfer to the lanthanide ion is absent. The triplet state lifetime under cryogenic conditions for organo-lanthanide compounds usually ranges up to tens of milliseconds. The compound LaL1(TTA)3 reported herein exhibits 77 K phosphorescence observable by the naked eye for up to 30 s. Optical spectroscopy, density functional theory (DFT) and time-dependent DFT techniques have been applied to investigate the photophysical processes of this compound. In particular, on-off continuous irradiation cycles reveal a charging behaviour of the emission which is associated with triplet-triplet absorption because it shows a shorter rise lifetime than the corresponding decay lifetime and it varies with illumination intensity. The discovery of the behaviour of this compound provides insight into important photophysical processes of the triplet state of organo-lanthanide systems and may open new fields of application such as data encryption, anti-counterfeiting and temperature switching.

AB - Emission from the triplet state of an organo-lanthanide complex is observed only when the energy transfer to the lanthanide ion is absent. The triplet state lifetime under cryogenic conditions for organo-lanthanide compounds usually ranges up to tens of milliseconds. The compound LaL1(TTA)3 reported herein exhibits 77 K phosphorescence observable by the naked eye for up to 30 s. Optical spectroscopy, density functional theory (DFT) and time-dependent DFT techniques have been applied to investigate the photophysical processes of this compound. In particular, on-off continuous irradiation cycles reveal a charging behaviour of the emission which is associated with triplet-triplet absorption because it shows a shorter rise lifetime than the corresponding decay lifetime and it varies with illumination intensity. The discovery of the behaviour of this compound provides insight into important photophysical processes of the triplet state of organo-lanthanide systems and may open new fields of application such as data encryption, anti-counterfeiting and temperature switching.

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Charging and ultralong phosphorescence of lanthanide facilitated organic complex

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