Xiaoyu Zhao

Bio: Xiaoyu Zhao is an academic researcher from Dalian University of Technology. The author has contributed to research in topics: Photon upconversion & BODIPY. The author has an hindex of 3, co-authored 3 publications receiving 22 citations. Previous affiliations of Xiaoyu Zhao include Xinjiang University.

Truxene-bridged Bodipy fullerene tetrads without precious metals: study of the energy transfer and application in triplet–triplet annihilation upconversion

Abstract: Fullerenes can generate a triplet state efficiently without invoking the heavy-atom effect. However, their weak absorption in the visible spectral range makes fullerenes not an ideal triplet photosensitizer (PS). Herein, novel truxene-bridged fullerene and Bodipy tetrads were prepared by attaching Bodipy or Zn–porphyrin units (T-2B-C60 and T-B-C60-P) which show a stronger absorption band in the visible spectral range, and the maximum molar absorption coefficient is up to 5.63 × 105 M−1 cm−1 at 428 nm for T-B-C60-P. These tetrads show efficient singlet energy transfer from the Bodipy moiety to the fullerene/Zn–porphyrin moiety, the energy transfer rate constant is 2.72 × 109 s−1 and the efficiency is up to 90% for T-2B-C60. Electrochemical and computational studies show that T-B-C60-P exhibits photo electron transfer from fullerene to Zn–porphyrin and a T-B-C60−˙-P+˙ charge-separated state is formed. Nanosecond time-resolved transient difference absorption spectra show that the triplet excited state of T-B-C60-P is distributed on both the fullerene moiety and the Zn–porphyrin moiety, which can be used as the triplet PS for two-color excitable triplet–triplet annihilation upconversion, with a large anti-Stokes shift of 4074 cm−1.

Research Progress on CO2 Photocatalytic Reduction with Full Solar Spectral Responses

Abstract: Photoreduction of CO2 can effectively alleviate the troublesome global energy crisis and environmental problems by converting CO2 into hydrocarbons. Due to the discovery of photocatalysts that can ...

Visible-to-ultraviolet (<340 nm) photon upconversion by triplet–triplet annihilation in solvents

Abstract: In this article, visible-to-ultraviolet photon upconversion (UV-UC) by triplet–triplet annihilation in the emission range shorter than 340 nm, which has not been explored well, is presented and the relevant physicochemical characteristics are elucidated. Investigations were carried out in several deaerated solvents using acridone and naphthalene derivatives as a sensitizer and emitter, respectively. Both upconversion quantum efficiency and sample photostability under continuous photoirradiation strongly depended on the solvent. The former dependence is governed by the solvent polarity, which affects the triplet energy level matching between the sensitizer and emitter because of the solvatochromism of the sensitizer. To elucidate the latter, first we investigated the photodegradation of samples without the emitter, which revealed that the sensitizer degradation rate is correlated with the difference between the frontier orbital energy levels of the sensitizer and solvent. Inclusion of the emitter effectively suppressed the degradation of the sensitizer, which is ascribed to fast quenching of the triplet sensitizer by the emitter and justifies the use of ketonic sensitizers for UV-UC in solvents. A theoretical model was developed to acquire insight into the observed temporal decays of the upconverted emission intensity under continuous photoirradiation. The theoretical curves generated by this model fitted the experimental decay curves well, which allowed the reaction rate between the emitter and solvent to be obtained. This rate was also correlated with the difference between the frontier orbital energy levels of the emitter and solvent. Finally, based on the acquired findings, general design guidelines for developing UV-UC samples were proposed.

Corroles and Hexaphyrins: Synthesis and Application in Cancer Photodynamic Therapy.

Abstract: Corroles and hexaphyrins are porphyrinoids with great potential for diverse applications. Like porphyrins, many of their applications are based on their unique capability to interact with light, i.e., based on their photophysical properties. Corroles have intense absorptions in the low-energy region of the uv-vis, while hexaphyrins have the capability to absorb light in the near-infrared (NIR) region, presenting photophysical features which are complementary to those of porphyrins. Despite the increasing interest in corroles and hexaphyrins in recent years, the full potential of both classes of compounds, regarding biological applications, has been hampered by their challenging synthesis. Herein, recent developments in the synthesis of corroles and hexaphyrins are reviewed, highlighting their potential application in photodynamic therapy.