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Issue 5, 2016
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A new medium for triplet–triplet annihilated upconversion and photocatalytic application

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Abstract

Since the triplet–triplet annihilated upconversion (TTA-UC) materials work efficiently only in degassing organic solvents, it is of significance to find a new medium without toxicity and volatility and that promotes TTA-UC. Here, we firstly reported the effect of an OH-containing medium on low power upconversion and found that in alcohol solvent containing β-cyclodextrin (β-CD), the phosphorescence lifetime (τp) of the sensitizer (PdTPP) and the fluorescence quantum yield (Φf) of the acceptor (DPA) were enhanced with the increase in the number of OH-groups of the medium. A large triplet–triplet quenching constant (kq, 1.91 × 109 M−1 s−1) and high upconversion efficiency (ΦUC, ∼36%) of PdTPP/DPA were obtained under the excitation of a diode laser (532 nm, 60 mW cm−2). Under our green-to-blue upconversion irradiation, in a demonstration experiment the photocurrent was recorded at 0.09 μA cm−2, resulting from photocatalytic water splitting by a Cd0.7Zn0.3S photoanode and a Pt counter-electrode in a photoelectrochemical cell. The importance of this study suggests that upconversion-powered photoelectrochemistry possesses potential application for hydrogen generation from water under excitation of sun energy.

Graphical abstract: A new medium for triplet–triplet annihilated upconversion and photocatalytic application

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Supplementary files

Article information


Submitted
04 Sep 2015
Accepted
28 Oct 2015
First published
18 Nov 2015

Phys. Chem. Chem. Phys., 2016,18, 3430-3437
Article type
Paper
Author version available

A new medium for triplet–triplet annihilated upconversion and photocatalytic application

C. Ye, J. Wang, X. Wang, P. Ding, Z. Liang and X. Tao, Phys. Chem. Chem. Phys., 2016, 18, 3430
DOI: 10.1039/C5CP05288B

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