Novel near-infrared photoluminescence from platinum(II)-porphyrin (PtOEP) aggregates

Dienel, Thomas; Proehl, Holger; Fritz, Torsten; Leo, Karl

doi:10.1016/j.jlumin.2004.08.017

Cited by 28 publications

(31 citation statements)

References 21 publications

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“…There is only one report where phosphorescence of a PPV derivative is claimed to have been recorded with the help of Pt(II) octaethylporphine (PtOEP) as a triplet sensitizer 31. However, this emission is the same as that recorded from PtOEP aggregate reported by Leo et al32 We have also tried to record SY phosphorescence by isolating it in zeonex (to reduce triplet migration), by using triplet sensitizers such as PtOEP or PdTPBP (to increase the triplet population) and by using degassed iodotoluene solution at low temperatures (in an attempt to increase the spin‐orbit coupling and triplet formation yield and to promote the T 1 → S 0 radiative decay), but with no success. Nevertheless, the triplet properties of SY can be inferred from those of poly[2‐methoxy‐5‐(2‐ethyl‐hexyloxy)‐1,4‐phenylene‐vinylene] (MEH‐PPV), since SY consists of MEH‐PPV moieties.…”

Section: Resultsmentioning

confidence: 78%

Energy Upconversion via Triplet Fusion in Super Yellow PPV Films Doped with Palladium Tetraphenyltetrabenzoporphyrin: a Comprehensive Investigation of Exciton Dynamics

Jankus

Snedden

Bright

et al. 2012

Adv Funct Materials

105

121

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One of the key issues concerning the development of efficient polymer solar cell technology is the lack of viable materials which absorb in the near‐infrared (NIR) region. This could be resolved by up‐converting energy from the NIR into visible using triplet fusion (TF) with an additional layer that is fabricated separately from the solar cell and deposited on top. Theoretically a maximum upconversion (UC) via TF efficiency of 50% could be obtained. Here, it is demonstrated that in a film of commercially available poly(para‐phenylene vinylene) copolymer “super yellow” (SY) doped with 4% palladium(meso‐tetraphenyl‐tetrabenzoporphyrin) (PdTPBP) sensitizer, an UC efficiency of 6% can be achieved. By using femtosecond and nanosecond spectroscopies it is shown that the main UC efficiency loss mechanism is due to triplet quenching in PdTPBP aggregates. The PdTPBP intersystem crossing rate constant is determined to be 1.8 × 1011 s−1 and the triplet energy transfer rate constant from PdTPBP to SY to be 109 s−1. Quenching in PdTPBP aggregates can account for a triplet concentration loss in the range of 76‐99%. As such, preventing sensitizer aggregation in NIR‐to‐visible upconverting films is crucial and may lead to substantial increase of UC efficiencies in films.

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Section: Resultsmentioning

confidence: 78%

Energy Upconversion via Triplet Fusion in Super Yellow PPV Films Doped with Palladium Tetraphenyltetrabenzoporphyrin: a Comprehensive Investigation of Exciton Dynamics

Jankus

Snedden

Bright

et al. 2012

Adv Funct Materials

105

121

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show abstract

“…Simulations using the reported quenching rate constant (see Table 1) show that in this case a value of 0.8% also applies. The reason for this difference is not clear, but may reflect dye aggregation since clusters of PtOEP emit at 790 nm, [29][30] which would not be detected in the experiments. Sensitivity studies for [ 3 PtOEP]init are described in the SI.…”

Section: Dye Lifetime By Pulsed Laser Excitationmentioning

confidence: 84%

“…The photophysics were not fully described in the experimental studies, 7 so they have been determined using other work on PtOEP in polymer environments. [29][30] From the ground state, PtOEP absorbs at 380 nm and 547 nm to enter the first excited state; 30 greater than 99.9994% of PtOEP molecules excited to the first singlet state undergo intersystem crossing to the first excited triplet state 3 PtOEP. 29 This allows fluorescence from the singlet state to be neglected.…”

Section: Kinetics Of Dye Quenchingmentioning

confidence: 99%

“…PtOEP emits at 647 nm from the triplet state when well-dispersed in solution or embedded in a clear polymer. [29][30] For excited-state dye at high concentration or in solution with low viscosity, triplettriplet annihilation may occur. Triplet-triplet annihilation (TTA) is the process in which one triplet state PtOEP molecules quenches another and is itself excited back to the first excited singlet state.…”

Section: Kinetics Of Dye Quenchingmentioning

confidence: 99%

“…29 Two types of experiments are examined to construct and validate a kinetic model for PtOEP photoprocesses. One determines the dye's phosphorescence lifetime using pulsed laser excitation, [29][30] the other tracks the intensity of phosphorescence from continuous laser excitation of PtOEP as a function of time, I(t), during absorption and desorption of gases. 7…”

Section: Kinetics Of Dye Quenchingmentioning

confidence: 99%

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Predictive simulation of non-steady-state transport of gases through rubbery polymer membranes

Soniat

Tesfaye

Brooks

et al. 2018

Polymer

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15We develop a multiscale, physically-based reaction-diffusion kinetics model for non-steady-state 16 transport of simple gases through a rubbery polymer. The rubbery polymer case applies to 17 membrane applications where high permeability is desired or has developed due exposure to 18 plasticizers such as CO2. To construct a model that has no adjustable parameters, we utilize 19 experimental data from the literature as well as new measurements of non-steady-state 20 permeation. We have also performed molecular dynamics simulations of collisions of CO2 with 21 the surface of PDMS to obtain an estimate of the gas-polymer sticking probability. The model 22 successfully reproduces time-dependent experimental data for two distinct systems: (1) O2 23 quenching of a phosphorescent dye embedded in poly(n-butyl(amino) thionylphosphazene), and 24 (2) O2, N2, CH4 and CO2 transport through poly(dimethyl siloxane). The modeling study 25 provides new insights to microscopic aspects of permeant transport through rubbery polymers 26 and is used to predict selectivity targets for two gas separation applications. 27 28 2

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Organic Photovoltaics Using Tetraphenylbenzoporphyrin Complexes as Donor Layers

et al. 2009

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Novel near-infrared photoluminescence from platinum(II)-porphyrin (PtOEP) aggregates

Cited by 28 publications

References 21 publications

Energy Upconversion via Triplet Fusion in Super Yellow PPV Films Doped with Palladium Tetraphenyltetrabenzoporphyrin: a Comprehensive Investigation of Exciton Dynamics

Energy Upconversion via Triplet Fusion in Super Yellow PPV Films Doped with Palladium Tetraphenyltetrabenzoporphyrin: a Comprehensive Investigation of Exciton Dynamics

Predictive simulation of non-steady-state transport of gases through rubbery polymer membranes

Organic Photovoltaics Using Tetraphenylbenzoporphyrin Complexes as Donor Layers

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