The Experts below are selected from a list of 21840 Experts worldwide ranked by ideXlab platform
Guanying Chen - One of the best experts on this subject based on the ideXlab platform.
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ultraefficient singlet oxygen generation from manganese doped cesium Lead Chloride perovskite quantum dots
ACS Nano, 2020Co-Authors: Tianyu Zhao, Haichun Liu, Shenlong Jiang, Qun Zhang, Hans Agren, Guanying ChenAbstract:Lead halide perovskites hold promise for photovoltaics, lasers, and light-emitting diode (LED) applications, being known as light-harvesting or -emitting materials. Here we show that colloidal Lead...
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ultraefficient singlet oxygen generation from manganese doped cesium Lead Chloride perovskite quantum dots
ACS Nano, 2020Co-Authors: Tianyu Zhao, Haichun Liu, Shenlong Jiang, Qun Zhang, Hans Agren, Guanying ChenAbstract:Lead halide perovskites hold promise for photovoltaics, lasers, and light-emitting diode (LED) applications, being known as light-harvesting or -emitting materials. Here we show that colloidal Lead halide CsPbCl3 perovskite quantum dots (PQDs), when incorporating divalent manganese (Mn2+) ions, are able to produce spin-paired singlet oxygen molecules with over-unit quantum yield (∼1.08) in air conditions. Our mechanistic studies and atomic-level density functional theory calculations endorse an energy-migration-mediated quantum cutting process favoring multiple singlet oxygen generation (MSOG), in which one exciton-activated bulk Mn2+ ion (∼2.0 eV) inside the nanocrystal migrates its energy among the Mn2+ sublattice to two surface Mn2+ defect states (∼1.0 eV), followed by nonradiative energy transfers to two surrounding oxygen molecules. Moreover, superhydrophobicization of MSOG PQDs through silica-mediated polystyrene encapsulation prevents them from disintegrating in aqueous medium, enabling photodegradation of methyl orange at a rate even higher than that of the canonical titanium oxide photocatalyst. The observation of ultraefficient singlet oxygen generation in PQDs has implications for fields ranging from photodynamic therapy to photocatalytic applications.
Hans Agren - One of the best experts on this subject based on the ideXlab platform.
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ultraefficient singlet oxygen generation from manganese doped cesium Lead Chloride perovskite quantum dots
ACS Nano, 2020Co-Authors: Tianyu Zhao, Haichun Liu, Shenlong Jiang, Qun Zhang, Hans Agren, Guanying ChenAbstract:Lead halide perovskites hold promise for photovoltaics, lasers, and light-emitting diode (LED) applications, being known as light-harvesting or -emitting materials. Here we show that colloidal Lead...
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ultraefficient singlet oxygen generation from manganese doped cesium Lead Chloride perovskite quantum dots
ACS Nano, 2020Co-Authors: Tianyu Zhao, Haichun Liu, Shenlong Jiang, Qun Zhang, Hans Agren, Guanying ChenAbstract:Lead halide perovskites hold promise for photovoltaics, lasers, and light-emitting diode (LED) applications, being known as light-harvesting or -emitting materials. Here we show that colloidal Lead halide CsPbCl3 perovskite quantum dots (PQDs), when incorporating divalent manganese (Mn2+) ions, are able to produce spin-paired singlet oxygen molecules with over-unit quantum yield (∼1.08) in air conditions. Our mechanistic studies and atomic-level density functional theory calculations endorse an energy-migration-mediated quantum cutting process favoring multiple singlet oxygen generation (MSOG), in which one exciton-activated bulk Mn2+ ion (∼2.0 eV) inside the nanocrystal migrates its energy among the Mn2+ sublattice to two surface Mn2+ defect states (∼1.0 eV), followed by nonradiative energy transfers to two surrounding oxygen molecules. Moreover, superhydrophobicization of MSOG PQDs through silica-mediated polystyrene encapsulation prevents them from disintegrating in aqueous medium, enabling photodegradation of methyl orange at a rate even higher than that of the canonical titanium oxide photocatalyst. The observation of ultraefficient singlet oxygen generation in PQDs has implications for fields ranging from photodynamic therapy to photocatalytic applications.
Tianyu Zhao - One of the best experts on this subject based on the ideXlab platform.
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ultraefficient singlet oxygen generation from manganese doped cesium Lead Chloride perovskite quantum dots
ACS Nano, 2020Co-Authors: Tianyu Zhao, Haichun Liu, Shenlong Jiang, Qun Zhang, Hans Agren, Guanying ChenAbstract:Lead halide perovskites hold promise for photovoltaics, lasers, and light-emitting diode (LED) applications, being known as light-harvesting or -emitting materials. Here we show that colloidal Lead...
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ultraefficient singlet oxygen generation from manganese doped cesium Lead Chloride perovskite quantum dots
ACS Nano, 2020Co-Authors: Tianyu Zhao, Haichun Liu, Shenlong Jiang, Qun Zhang, Hans Agren, Guanying ChenAbstract:Lead halide perovskites hold promise for photovoltaics, lasers, and light-emitting diode (LED) applications, being known as light-harvesting or -emitting materials. Here we show that colloidal Lead halide CsPbCl3 perovskite quantum dots (PQDs), when incorporating divalent manganese (Mn2+) ions, are able to produce spin-paired singlet oxygen molecules with over-unit quantum yield (∼1.08) in air conditions. Our mechanistic studies and atomic-level density functional theory calculations endorse an energy-migration-mediated quantum cutting process favoring multiple singlet oxygen generation (MSOG), in which one exciton-activated bulk Mn2+ ion (∼2.0 eV) inside the nanocrystal migrates its energy among the Mn2+ sublattice to two surface Mn2+ defect states (∼1.0 eV), followed by nonradiative energy transfers to two surrounding oxygen molecules. Moreover, superhydrophobicization of MSOG PQDs through silica-mediated polystyrene encapsulation prevents them from disintegrating in aqueous medium, enabling photodegradation of methyl orange at a rate even higher than that of the canonical titanium oxide photocatalyst. The observation of ultraefficient singlet oxygen generation in PQDs has implications for fields ranging from photodynamic therapy to photocatalytic applications.
Shixun Wang - One of the best experts on this subject based on the ideXlab platform.
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oxalic acid enabled emission enhancement and continuous extraction of Chloride from cesium Lead Chloride bromide perovskite nanocrystals
Small, 2019Co-Authors: Shixun Wang, Xinyu Shen, Yu Zhang, Xingwei Zhuang, Dingke Xue, Xiangtong Zhang, Jinyang Zhu, Zhifeng Shi, Stephen V KershawAbstract:All-inorganic cesium Lead halide perovskite nanocrystals (NCs) have demonstrated excellent optical properties and an encouraging potential for optoelectronic applications; however, mixed-halide perovskites, especially CsPb(Cl/Br)3 NCs, still show lower photoluminescence quantum yields (PL QY) than the corresponding single-halide materials. Herein, anhydrous oxalic acid is used to post-treat CsPb(Cl/Br)3 NCs in order to initially remove surface defects and halide vacancies, and thus, to improve their PL QY from 11% to 89% for the emission of 451 nm. Furthermore, due to the continuous chelating reaction with the oxalate ion, Chloride anions from the mixed-halide CsPb(Cl/Br)3 perovskite NCs could be extracted, and green emitting CsPbBr3 NCs with PL QY of 85% at 511 nm emission are obtained. Besides being useful to improve the emission of CsPb(Cl/Br)3 NCs, the oxalic acid treatment strategy introduced here provides a further tool to adjust the distribution of halide anions in mixed-halide perovskites without using any halide additives.
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cesium Lead Chloride bromide perovskite quantum dots with strong blue emission realized via a nitrate induced selective surface defect elimination process
Journal of Physical Chemistry Letters, 2019Co-Authors: Shixun Wang, Xinyu Shen, Yu Zhang, Xingwei Zhuang, Xiangtong Zhang, Stephen V Kershaw, Yu Wang, Andrey L RogachAbstract:Cesium Lead halide perovskites emitting blue light in the 460–470 nm range of wavelengths have so far been plagued with rather poor luminescent performance, placing inevitable limitations on the development of perovskite nanocrystal-based blue light-emitting devices. Herein, a selective surface defect elimination process with the help of hydrated nitrates was introduced into the perovskite/toluene solution to strip the undesired surface defects and vacancies and to boost the photoluminescence quantum yield of true-blue-light-emitting (at 466 nm) CsPb(Cl/Br)3 perovskite nanocrystals to the impressive value of 85%. Unlike the conventional passivation strategy, the anionic nitrate ions are able to desorb the undesired surface metallic Lead and combine with excess surface metal ions, leaving perovskite quantum dots with better crystallinity and fewer surface defects.
Andrey L Rogach - One of the best experts on this subject based on the ideXlab platform.
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cesium Lead Chloride bromide perovskite quantum dots with strong blue emission realized via a nitrate induced selective surface defect elimination process
Journal of Physical Chemistry Letters, 2019Co-Authors: Shixun Wang, Xinyu Shen, Yu Zhang, Xingwei Zhuang, Xiangtong Zhang, Stephen V Kershaw, Yu Wang, Andrey L RogachAbstract:Cesium Lead halide perovskites emitting blue light in the 460–470 nm range of wavelengths have so far been plagued with rather poor luminescent performance, placing inevitable limitations on the development of perovskite nanocrystal-based blue light-emitting devices. Herein, a selective surface defect elimination process with the help of hydrated nitrates was introduced into the perovskite/toluene solution to strip the undesired surface defects and vacancies and to boost the photoluminescence quantum yield of true-blue-light-emitting (at 466 nm) CsPb(Cl/Br)3 perovskite nanocrystals to the impressive value of 85%. Unlike the conventional passivation strategy, the anionic nitrate ions are able to desorb the undesired surface metallic Lead and combine with excess surface metal ions, leaving perovskite quantum dots with better crystallinity and fewer surface defects.
