Upconversion-induced delayed fluorescence in multicomponent organic systems: Role of Dexter energy transfer

Monguzzi, Angelo; Tubino, R.; Meinardi, Francesco

doi:10.1103/physrevb.77.155122

Cited by 198 publications

(230 citation statements)

References 22 publications

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“…The dyads are weakly phosphorescent (Φ P = 0.6 %); however, we proved that the triplet excited states of the Ir III complexes are efficiently populated upon photoexcitation, by using the complexes as triplet sensitizers for triplet-triplet annihilation upconversion. [21][22][23][24] Upconversion quantum yields (Φ UC ) of up to 23.4 % were observed, whereas Φ UC = 0.0 % for Ir-1 and Ir-2 (two complexes without the visible-light harvesting effect) under the same experimental conditions. between the coumarin unit and the imidazole-Phen unit, to investigate the potential effect of the intramolecular hydrogen bond in the ligand of Ir-3.…”

Section: Quenched In An Irmentioning

confidence: 85%

“…Herein we selected upconversion based on triplet-triplet-annihilation (TTA), [21][22][23][24] which requires triplet sensitizers to harvest excitation light and transfer the energy to a triplet acceptor (see Jablonski diagram, Scheme 2, for photophysical details). [21] Upconversion (UC) is important for photovoltaics, photocatalysis, and nonlinear photonics.…”

Section: Triplet-triplet-annihilation Upconversionmentioning

confidence: 99%

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Visible‐Light Harvesting with Cyclometalated Iridium(III) Complexes Having Long‐Lived ³IL Excited States and Their Application in Triplet–Triplet‐Annihilation Based Upconversion

et al. 2011

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Cyclometalated iridium(III) complexes with intense absorption in the visible region (ε = 70920 M -1 cm -1 at 466 nm) were prepared by incorporating light-harvesting coumarin into the diimine ligand (for comparison: ε = 7030 M -1 cm -1 at 371 nm for the model diimine complex without light-harvesting ability). The complexes feature long-lived intraligand triplet excited states ( 3 IL, supported by spin density analysis of the triplet state). At room temperature, lifetimes, τ T , are up to 75.5 μs, as determined by nanosecond time-resolved transient absorption spectroscopy. Despite the weak phosphorescence (Φ P = 0.6-0.7 %) observed for the complexes, the triplet excited state (T 1 ) was demonstrated to be efficiently

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Section: Quenched In An Irmentioning

confidence: 85%

Section: Triplet-triplet-annihilation Upconversionmentioning

confidence: 99%

Visible‐Light Harvesting with Cyclometalated Iridium(III) Complexes Having Long‐Lived ³IL Excited States and Their Application in Triplet–Triplet‐Annihilation Based Upconversion

et al. 2011

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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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“…The operation of these devices is normally explained by two similar mechanisms for energy transfer, namely, the Förster (transition dipole moments interaction) and the Dexter (exchange interaction). [ 10 ] The fi rst mechanism is a radiative process, while the second is a nonradiative phenomenon depending on the spatial distance between donor/acceptor sites, as evidenced by the expression of the transfer rate k EET between donor/acceptor sites in Equation ( 2) [ 10 ] …”

Section: Wileyonlinelibrarycommentioning

confidence: 99%

“…[7][8][9] These effects are thought to be due to short range exchange energy transfer (EET) between the two components [ 10 ] and quantum relativistic effects. [ 11 ] PANI has become one of the most important intrinsically conducting polymers (ICPs) and has been intensively studied in the last two decades.…”

mentioning

confidence: 99%

Impedance Hyperbolicity in Inkjet‐Printed Graphene Nanocomposites: Tunable Capacitors for Advanced Devices

Chiolerio

Porro

Bocchini

2016

Adv Elect Materials

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constant and any other evolution is based on device architecture alone. [ 2 ] Based on these considerations, how can the computational power of today's electronic environment be further increased and the power consumption concurrently reduced? The sources of power consumption in a microprocessor are three: dynamic power consumption (charging and discharging of parasitic capacitances during commutation), dynamic shortcircuit power consumption (due to accidental simultaneous conduction between some transistors in the closed state during operation), and leakage power consumption (due to leakage currents fl owing even when the system is in idle mode, which accounts for a total of 40%). [ 3 ] Thus, the major heat source is due to dynamic operation and could be mitigated by reducing parasitic capacitances. Scaling lateral cell size requires enormous efforts from the technological point of view. Better, compensating parasitic capacitances by means of negative capacitors, is a route never attempted due to the lack of simple solutions providing a single material featuring such property: frequently negative capacitance is emulated by a network of standard components and is pretty a complex tool, requiring more than ten transistors. [ 4 ] Placing discrete/integrated components and boosting commercial products by either extending their working frequency range or reducing their power consumption would require a simplification for electronic engineers.Impedance properties of multicomponent organic materials based on polyaniline (PANI) showed revolutionary phenomena such as negative permittivity, giant magnetoresistance, and negative supercapacitance [ 5,6 ] and exciting corresponding applications, in particular electrochemical supercapacitors. [7][8][9] These effects are thought to be due to short range exchange energy transfer (EET) between the two components [ 10 ] and quantum relativistic effects. [ 11 ] PANI has become one of the most important intrinsically conducting polymers (ICPs) and has been intensively studied in the last two decades. [12][13][14] Recent works [ 6,15 ] have demonstrated that PANI can be used for the synthesis of functional inks that can be processed by digital printing, showing unusual electronic properties such as negative supercapacitance in the low-frequency range. A peculiar charge versus DC voltage behavior, shaped as the typical "butterfl y" diagram, is a clear evidence for underlying An easy method for the fabrication of a completely tunable capacitor based on inkjet-printed hybrid organic systems is here reported. The quantum relativistic properties of graphene-induce electronic resonances between the polyaniline polymeric matrix and the graphene fi ller, with extremely long transfer rates. These events induce peculiar physical phenomena due to impedance hyperbolicity, such as voltage-controlled phase shifting. The apparent capacitance is shown to diverge to infi nity having a sign dependent on the frequency sweep direction. Hence devices may be geometrically tuned to operate with desired ca...

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Upconversion-induced delayed fluorescence in multicomponent organic systems: Role of Dexter energy transfer

Cited by 198 publications

References 22 publications

Visible‐Light Harvesting with Cyclometalated Iridium(III) Complexes Having Long‐Lived ³IL Excited States and Their Application in Triplet–Triplet‐Annihilation Based Upconversion

Visible‐Light Harvesting with Cyclometalated Iridium(III) Complexes Having Long‐Lived ³IL Excited States and Their Application in Triplet–Triplet‐Annihilation Based Upconversion

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

Impedance Hyperbolicity in Inkjet‐Printed Graphene Nanocomposites: Tunable Capacitors for Advanced Devices

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Upconversion-induced delayed fluorescence in multicomponent organic systems: Role of Dexter energy transfer

Cited by 198 publications

References 22 publications

Visible‐Light Harvesting with Cyclometalated Iridium(III) Complexes Having Long‐Lived 3IL Excited States and Their Application in Triplet–Triplet‐Annihilation Based Upconversion

Visible‐Light Harvesting with Cyclometalated Iridium(III) Complexes Having Long‐Lived 3IL Excited States and Their Application in Triplet–Triplet‐Annihilation Based Upconversion

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

Impedance Hyperbolicity in Inkjet‐Printed Graphene Nanocomposites: Tunable Capacitors for Advanced Devices

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Product

Resources

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Visible‐Light Harvesting with Cyclometalated Iridium(III) Complexes Having Long‐Lived ³IL Excited States and Their Application in Triplet–Triplet‐Annihilation Based Upconversion

Visible‐Light Harvesting with Cyclometalated Iridium(III) Complexes Having Long‐Lived ³IL Excited States and Their Application in Triplet–Triplet‐Annihilation Based Upconversion