Triplet–triplet annihilation based upconversion: from triplet sensitizers and triplet acceptors to upconversion quantum yields

Zhao, Jianzhang; Ji, Shaomin; Guo, Huimin

doi:10.1039/c1ra00469g

Cited by 585 publications

(667 citation statements)

References 56 publications

(121 reference statements)

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“…In this process, light with al ong wavelength is converted into photons of higher energy by utilizing triplets ensitizers. [11,12] TTAb ased upconversion has attracted agreat deal of attention,primarily because of its promise in applications such as dye-sensitized solar cells, photocatalysis and artificial photosynthetic systems.…”

Section: Discussionmentioning

confidence: 99%

“…[2] Triplet photosensitizers have been considered for av ariety of applicationss uch as phosphorescent materials, [1,3,4] phosphorescent bioimaging, [5,6] chemosensors, [7,8] photoinitiated polymerization, [9] photocatalysis [10] and triplet-triplet annihilationb ased upconversion (TTAU). [11,12] Moreover,t riplet photosensitizers have been used for oncological and antibacterial photodynamic therapy (PDT) to eradicate cancerous cells or pathogens. [13,14] The latter application requires visible light to NIR light absorbing photosensitizers.…”

Section: Introductionmentioning

confidence: 99%

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Visible‐Light Photoactive, Highly Efficient Triplet Sensitizers Based on Iodinated Aza‐BODIPYs: Synthesis, Photophysics and Redox Properties

Gut

Łapok

Drelinkiewicz

et al. 2017

Chemistry An Asian Journal

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As eries of novel iodinated NO 2 -substituted azaBODIPYs have been synthesized and characterized.H ighly desirable photophysical and photochemical properties were induced in NO 2 -substituted aza-BODIPYs by iodinationo ft he pyrrole rings. In particular, highv alues of singlet oxygen quantum yields (F D )r anging from 0.79 to 0.85 were measured. The photooxygenation process proceeds via aT ype II mechanism under the experimental conditions applied. The compounds studied exhibited an absorption band within the so-called "therapeutic window", with l max located between 645 nm to 672 nm. They were non-fluorescent at room temperature with excited singlet-state lifetimes within the picosecond range as measured by femtosecond transient absorption. Nanosecond laser flash photolysis experiments revealed T 1 !T n absorption spanning from ca. 400 nm to ca. 500 nm and allowedd etermination of the triplet-state lifetimes. The estimated triplet lifetimes (t T )i nd eaerated acetonitrile ranged between 2.74 msa nd 3.50 ms. As estimated by CV/DPV measurements, all iodinateda za-BODIPYs studied exhibited one irreversible oxidation and two quasireversible reductions processes. Estimation of the E HOMO gave the value of À6.06 to À6.26 eV while the E LUMO was found to be located at ca. À4.6 eV.T hermogravimetric (TGA) analysis revealed that iodinated aza-BODIPYs weres table up to approximately 300 8C. All compounds studied exhibit high photostability in toluene solution.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visible‐Light Photoactive, Highly Efficient Triplet Sensitizers Based on Iodinated Aza‐BODIPYs: Synthesis, Photophysics and Redox Properties

Gut

Łapok

Drelinkiewicz

et al. 2017

Chemistry An Asian Journal

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“…The process of TTA-UC [15][16][17][18][19][20][21][22][23][24] involves the excitation of 'sensitizer' molecules, in this case Pd porphyrins, by light with energy below the device onset energy. The singlet-excited sensitizers undergo rapid intersystem crossing to the lowest-energy triplet state.…”

Section: Introductionmentioning

confidence: 99%

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Nattestad

Cheng

MacQueen

et al. 2014

JoVE

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The poor response of dye-sensitized solar cells (DSCs) to red and infrared light is a significant impediment to the realization of higher photocurrents and hence higher efficiencies. Photon up-conversion by way of triplet-triplet annihilation (TTA-UC) is an attractive technique for using these otherwise wasted low energy photons to produce photocurrent, while not interfering with the photoanodic performance in a deleterious manner. Further to this, TTA-UC has a number of features, distinct from other reported photon up-conversion technologies, which renders it particularly suitable for coupling with DSC technology. In this work, a proven high performance TTA-UC system, comprising a palladium porphyrin sensitizer and rubrene emitter, is combined with a high performance DSC (utilizing the organic dye D149) in an integrated device. The device shows an enhanced response to sub-bandgap light over the absorption range of the TTA-UC sub-unit resulting in the highest figure of merit for up-conversion assisted DSC performance to date. Video LinkThe video component of this article can be found at

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“…Crystal microstructure, morphology and UC luminescence properties of samples were investigated by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and upconversion photoluminescence spectra. [23] . …”

mentioning

confidence: 99%

Upconversion Performance Enhancement of NaYF₄:Yb/Tm by Codoping Hf⁴⁺as Energy Migrator

Huang¹,

Han²,

Zhang³

et al. 2016

Acta Chim. Sinica

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4＋ or Zr 4＋ and corresponding samples were named as Hf0, Hf2, Hf4, Hf6, Hf8 and Zr0, Zr2, Zr4, Zr6, Zr8, respectively. In a typical procedure, trivalent nitrate stock solutions of 0.2 mol/L were prepared at first by dissolving the corresponding metal oxide in concentrated nitric acid or hydrofluoric acid at elevated temperatures. And then, a certain mole percentage of trivalent nitrate solutions were added into 20 mL 0.04 mmol EDTA aqueous solution. After vigorous stirring for 30 min, 25 mL ethanol solution containing 0.2 mmol NaF, 0.2 mmol NH 4 HF 2 and corresponding stoichiometric amount Hf 4＋ or Zr 4＋ were dropwise added into the solution, and then pH value of solution was adjusted to 3.0 by addition 1 mol/L HF, and stirring continued for 30 min. Then the emulsion mixture was moved to PTFE-lined high pressure pot and incubated in oven at 180 ℃ for 12 h. The final products were collected, washed several times with water and ethanol alternately, and gathered by centrifugation, and then dried in oven at 60 ℃. Crystal microstructure, morphology and UC luminescence properties of samples were investigated by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and upconversion photoluminescence spectra. Results revealed the bond distance of F 1 -Y and F 2 -Y become close with the rising of Hf 4＋ or Zr 4＋ codoped concentration, indicating crystal field asymmetry of rare earth ions were tuned effectively by Hf 4＋ or Zr 4＋ codoping. Electron hypersensitive transition was promoted, and the intensity of 802 nm emission was enhanced obviously. Hf 4＋ ion was a better dopant than Zr 4＋ , for the extranuclear electronic structure of Hf 4＋ was the same with rare earth ions, and Hf 4＋ ion was involved in UC process as a migrator to improve Tm 3＋ upper state levels'population. UC luminescence of Hf 4＋ codoped sample were enhanced obviously, especially the shortwave emissions. The reported work establishes the understanding of Hf 4＋ as a migrator for Tm 3＋ ions upconversion luminescence, which may be helpful for design and synthesis of high-performance upconversion materials.

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Triplet–triplet annihilation based upconversion: from triplet sensitizers and triplet acceptors to upconversion quantum yields

Cited by 585 publications

References 56 publications

Visible‐Light Photoactive, Highly Efficient Triplet Sensitizers Based on Iodinated Aza‐BODIPYs: Synthesis, Photophysics and Redox Properties

Visible‐Light Photoactive, Highly Efficient Triplet Sensitizers Based on Iodinated Aza‐BODIPYs: Synthesis, Photophysics and Redox Properties

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Upconversion Performance Enhancement of NaYF₄:Yb/Tm by Codoping Hf⁴⁺as Energy Migrator

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Triplet–triplet annihilation based upconversion: from triplet sensitizers and triplet acceptors to upconversion quantum yields

Cited by 585 publications

References 56 publications

Visible‐Light Photoactive, Highly Efficient Triplet Sensitizers Based on Iodinated Aza‐BODIPYs: Synthesis, Photophysics and Redox Properties

Visible‐Light Photoactive, Highly Efficient Triplet Sensitizers Based on Iodinated Aza‐BODIPYs: Synthesis, Photophysics and Redox Properties

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Upconversion Performance Enhancement of NaYF4:Yb/Tm by Codoping Hf4+as Energy Migrator

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Upconversion Performance Enhancement of NaYF₄:Yb/Tm by Codoping Hf⁴⁺as Energy Migrator