Low-power green-to-blue and blue-to-UV upconversion in rigid polymer films

Merkel, Paul B.; Dinnocenzo, Joseph P.

doi:10.1016/j.jlumin.2008.10.013

Cited by 133 publications

(151 citation statements)

References 20 publications

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“…For example, Merkel and Dinnocenzo have reported upconversion with an efficiency of 0.02% in glassy poly(methyl methacrylate) (PMMA) comprising 0.005 wt% of PtOEP as sensitizer and 0.09% of DPA as emitter. 68 Monguzzi et al reported that upconversion can be seen in cellulose acetate comprising 0.005 wt% of PdPh4TPB as sensitizer and 3 wt% of 9,10-bisphenylethynyl anthracene as emitter below the glass transition temperature (T g ¼ 67 C). Thus, in both these studies TTA-UC was observed under conditions where the dye molecules are immobilized.…”

Section: Dispersion Of Chromophores In Polymeric Matricesmentioning

confidence: 99%

Low-power photon upconversion through triplet–triplet annihilation in polymers

2012

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Low-power upconversion via sensitized triplet-triplet annihilation (TTA-UC) is a useful and versatile process that allows for the conversion of optical radiation into photons of higher energy. While this effect had been known to occur in solution for some 50 years, it was only very recently realized for the first time in polymers. The possibility to realize the TTA-UC process in solid materials is important for a variety of applications that range from the optimization of photovoltaic devices to bioimaging. This article provides a brief introduction to the field, summarizes the underlying photophysical aspects, reviews the design concepts for TTA-UC in polymers, and summarizes the recent advances in the development of such materials.

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Section: Dispersion Of Chromophores In Polymeric Matricesmentioning

confidence: 99%

Low-power photon upconversion through triplet–triplet annihilation in polymers

2012

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“…If these requirements are met, the excitation intensity threshold I th required to obtain the maximum QY uc can be achieved below the solar irradiance, thus allowing for the design and development of UC-assisted devices. 34 However, despite several materials based on polymers, 21,[35][36][37][38] supramolecular gels, 39-41 organic 42 or polymeric 22,43 glasses, and hybrid nanocrystal/dye films 23 showed interesting performances at low powers, examples of prototype solar devices are still in the embryonal state.…”

Section: Principles Of Sensitized Triplet-triplet Annihilation-based mentioning

confidence: 99%

Recent advances in the application triplet–triplet annihilation-based photon upconversion systems to solar technologies

Pedrini

Monguzzi

2017

J. Photon. Energy

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Abstract. Upconversion (UC) of low-energy photons into high-energy light can in principle increase the efficiency of solar devices by converting photons with energies below the energy absorption threshold into radiation that can be utilized. Among UC mechanisms, the sensitized triplet-triplet annihilation-based upconversion (sTTA-UC) is the most recent that would be applied in solar technologies. sTTA-UC was demonstrated using sunlight in 2006, and due to its high efficiency at low excitation intensities with noncoherent light, it is considered a promising strategy for the recovering of subbandgap photons. Here, we describe briefly the working principle of the sTTA-UC, and we review the most recent advances of its use in solar applications.

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“…2 In a solid PMMA (Poly(methyl methacrylate) film, an upconversion (UC) efficiency of 0.02% was measured for the upconverter pair DPA:PtOEP, excited with a monochromatic irradiance of only 9 W/m 2 at 533 nm. 3 These rather low values indicate the need for further improvements of the UCQY. Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Organic upconverters embedded in a Bragg structure

et al. 2014

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For high band gap solar cells, organic molecule based upconverter materials are promising to reduce transmission losses of photons with energies below the absorption threshold. We investigate the approach of embedding the organic upconverter DPA:PtOEP directly into each second layer of a Bragg stack to achieve an enhancement of upconversion performance. The two major effects that influence the upconversion process within the Bragg stack are simulated based on experimentally determined input parameters. The locally increased irradiance is simulated using the scattering matrix method. The variation of the density of photon states is obtained from calculations of the eigenmodes of the photonic crystal using the plane wave expansion method. A relative irradiance enhancement of 3.23 has been found for a Bragg stack of 31 layers including λ/8-layers on both sides. For suppressing the loss mechanism of direct sensitizer triplet decay via variations of the density of photon states, a different design of the Bragg stack is necessary than for maximum irradiance enhancement. In order to find the optimum design to increase upconversion quantum yield, both simulation results need to be coupled in a rate-equation model. The irradiance enhancement found in our simulation is significantly higher than the one found in the simulation of a grating-waveguide structure, which achieved an increase of upconversion quantum yield by a factor of 1.8. Thus, the Bragg structure is very promising for upconversion quantum yield enhancement

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Low-power green-to-blue and blue-to-UV upconversion in rigid polymer films

Cited by 133 publications

References 20 publications

Low-power photon upconversion through triplet–triplet annihilation in polymers

Low-power photon upconversion through triplet–triplet annihilation in polymers

Recent advances in the application triplet–triplet annihilation-based photon upconversion systems to solar technologies

Organic upconverters embedded in a Bragg structure

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