Photochemical upconversion of light for renewable energy and more

Schmidt, Timothy W.; MacQueen, Rowan W.

doi:10.1117/12.2195424

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…Increasing the concentration of the sensitizer above about 1 mM in solution has not been found to be beneficial. ,, While the precise reason for this has not been elucidated, it is likely to be due to aggregation or the external heavy atom effect foreshortening the lifetimes of emitter triplets. Nevertheless, should it be possible to increase N S by a factor of 10 or more without detrimental effects, 1.04 mA cm –2 should be realizable at a film thickness of just 5.2 μm.…”

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confidence: 99%

Optimizing the Efficiency of Solar Photon Upconversion

2017

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Low-energy photons, which are not used by a solar cell, can be converted to higher-energy photons by photon upconversion. The figure-of-merit of upconvertors, J UC , is given in mA cm −2 under 1 sun excitation conditions. A device-relevant J UC should not be less than 0.1 mA cm −2 . However, to date, the highest J UC reported is in the 10 −2 mA cm −2 range. In this Perspective, we analyze the shortcomings of previously reported devices and unfold a roadmap toward device-relevant, high-efficiency upconvertors.

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confidence: 99%

Optimizing the Efficiency of Solar Photon Upconversion

2017

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“…TTA-UC has gained considerable attention over the last decade because of its good efficiency even with a low power density (<10 mW/cm 2 ) and incoherent excitation light (as sunlight, 0.1 W/cm 2 ). , To observe TTA emission, and more importantly to maximize the efficiencies, the sensitizer and emitter photophysical properties need to be carefully designed.…”

Section: Introductionmentioning

confidence: 99%

Green Solvent Selection for Green-to-Blue Upconversion Based on TTA

Quaglia

Campana

Latterini

et al. 2022

ACS Sustainable Chem. Eng.

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Triplet−triplet annihilation photon upconversion (TTA-UC) of an organic molecular dye pair, 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphyrin platinum(II) (PtOEP) and 1,3,6,8tetraphenylpyrene (TPPy), has been studied in a wide range of green solvents (alcohols, esters, carbonates, ketones, aromatics, ethers, and dipolar aprotic). UC is important for the study of energy-transfer reactions where the solvent plays a crucial role. To design and process materials for future real applications, growing attention is directed to the use of green solvents, while UC with a few exceptions is generally studied using classic toxic media. In this contribution, the results obtained demonstrate that several green solvents can be valuable options to replace classic toxic counterparts, allowing the photon upconversion with efficient quantum yields also compared to a traditional solvent such as toluene. These results pave the way for the development of a more sustainable TTA-UC system as an effective tool to direct the design of modern green photovoltaic and photocatalytic reactions.

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“…Here, we use simulations [4] to show how advanced triplet exciton physics can be applied to shift the fate of excitons towards annihilation and away from other decay mechanisms. In particular, we focus on the Boltzmann distribution of triplets between molecules and the recently discovered quenching action of the sensitizer [26,29] on the triplet exciton storage in the emitter.…”

Section: Introductionmentioning

confidence: 99%

Photochemical Upconversion Theory: Importance of Triplet Energy Levels and Triplet Quenching

2019

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Photochemical upconversion is a promising way to boost the efficiency of solar cells using triplet exciton annihilation. Currently, predicting the performance of photochemical upconversion devices is challenging. We present an open source software package which takes experimental parameters as inputs and gives the figure of merit of an upconversion system, enabling theory-driven design of better solar energy devices. We incorporate the statistical distribution of triplet excitons between the sensitizer and the emitter. Using the dynamic quenching effect of the sensitizer on emitter triplet excitons, we show that the optimal sensitizer concentration can be below the sensitizer solubility limit in liquid devices. These theoretical contributions can explain, without use of heavy atom-induced triplet exciton formation or phenyl group rotation, the experimental failure of zinc octaethylporphyrin to effectively sensitize diphenylanthracene, where platinum octaethylporphyrin succeeds. Our predictions indicate a change in direction for device design that will reduce triplet exciton losses. arXiv:1908.04927v1 [cond-mat.mtrl-sci]

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Photochemical upconversion of light for renewable energy and more

Cited by 4 publications

References 32 publications

Optimizing the Efficiency of Solar Photon Upconversion

Optimizing the Efficiency of Solar Photon Upconversion

Green Solvent Selection for Green-to-Blue Upconversion Based on TTA

Photochemical Upconversion Theory: Importance of Triplet Energy Levels and Triplet Quenching

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