Twenty-fold Enhancement of Gadolinium-Porphyrin Phosphorescence at Room Temperature by Free Gadolinium Ion in Liquid Phase

Lixin Zang, Huimin Zhao, Yangdong Zheng, Feng Qin, Jianting Yao, Ye Tian, Zhiguo Zhang, Wenwu Cao

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The influence of free gadolinium ion (Gd3+) on room-temperature phosphorescence (RTP) of gadolinium labeled hematoporphyrin monomethyl ether (Gd-HMME) was studied. Twenty-fold enhancement of Gd-HMME RTP by the titration of free Gd3+ was achieved. We found that the absorption from the ground (S0) to singlet excited states of Gd-HMME did not change with the addition of Gd3+, which means that the phosphorescence quantum yield has been tuned from 1.4% to 28%. According to the excitation spectra, the transition possibility from S0 to the lowest triplet excited state (T1) is increased by 1.2-fold because of the heavy atom effect of free Gd3+. The phosphorescence lifetime of Gd-HMME with free Gd3+ is 7.0-fold greater than that of Gd-HMME itself, which demonstrates that the nonradiative processes of Gd-HMME is decreased by Gd3+ with the rate constant of nonradiative processes decreasing from 2.2(2) × 105 to 2.8(2) × 104 s-1. This sharp decrease is mainly responsible for the huge enhancement of Gd-HMME RTP. The reason for the decrease of nonradiative processes is due to the formation of a rigid microenvironment, which protects Gd-HMME from being quenched.

Original languageEnglish (US)
Pages (from-to)2811-28116
Number of pages25306
JournalJournal of Physical Chemistry C
Volume119
Issue number50
DOIs
StatePublished - Dec 17 2015

Fingerprint

Phosphorescence
Gadolinium
Porphyrins
phosphorescence
gadolinium
porphyrins
liquid phases
Ethers
ethers
Ions
augmentation
Liquids
room temperature
ions
Temperature
Excited states
excitation
hematoporphyrin monomethyl ether
Quantum yield
Electron transitions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Zang, Lixin ; Zhao, Huimin ; Zheng, Yangdong ; Qin, Feng ; Yao, Jianting ; Tian, Ye ; Zhang, Zhiguo ; Cao, Wenwu. / Twenty-fold Enhancement of Gadolinium-Porphyrin Phosphorescence at Room Temperature by Free Gadolinium Ion in Liquid Phase. In: Journal of Physical Chemistry C. 2015 ; Vol. 119, No. 50. pp. 2811-28116.
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Twenty-fold Enhancement of Gadolinium-Porphyrin Phosphorescence at Room Temperature by Free Gadolinium Ion in Liquid Phase. / Zang, Lixin; Zhao, Huimin; Zheng, Yangdong; Qin, Feng; Yao, Jianting; Tian, Ye; Zhang, Zhiguo; Cao, Wenwu.

In: Journal of Physical Chemistry C, Vol. 119, No. 50, 17.12.2015, p. 2811-28116.

Research output: Contribution to journalArticle

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T1 - Twenty-fold Enhancement of Gadolinium-Porphyrin Phosphorescence at Room Temperature by Free Gadolinium Ion in Liquid Phase

AU - Zang, Lixin

AU - Zhao, Huimin

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AB - The influence of free gadolinium ion (Gd3+) on room-temperature phosphorescence (RTP) of gadolinium labeled hematoporphyrin monomethyl ether (Gd-HMME) was studied. Twenty-fold enhancement of Gd-HMME RTP by the titration of free Gd3+ was achieved. We found that the absorption from the ground (S0) to singlet excited states of Gd-HMME did not change with the addition of Gd3+, which means that the phosphorescence quantum yield has been tuned from 1.4% to 28%. According to the excitation spectra, the transition possibility from S0 to the lowest triplet excited state (T1) is increased by 1.2-fold because of the heavy atom effect of free Gd3+. The phosphorescence lifetime of Gd-HMME with free Gd3+ is 7.0-fold greater than that of Gd-HMME itself, which demonstrates that the nonradiative processes of Gd-HMME is decreased by Gd3+ with the rate constant of nonradiative processes decreasing from 2.2(2) × 105 to 2.8(2) × 104 s-1. This sharp decrease is mainly responsible for the huge enhancement of Gd-HMME RTP. The reason for the decrease of nonradiative processes is due to the formation of a rigid microenvironment, which protects Gd-HMME from being quenched.

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