Energy Up‐Conversion by Low‐Power Excitation: New Applications of an Old Concept

Ceroni, Paola

doi:10.1002/chem.201101102

Cited by 162 publications

(175 citation statements)

References 17 publications

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“…We are particularly interested in triplet electronic spin states, whose applications encompass medical photodynamic therapy, 1,2 energy up-conversion by triplet-triplet annihilation, 3,4 organic light emitting devices (OLED) 5,6 and biological imaging of oxygen. 7,8 In imaging applications, such as oxygen imaging by phosphorescence lifetime, 9 the ability to impose control over spatial localization of triplet states of probe molecules, e.g.…”

Section: Introductionmentioning

confidence: 99%

Generation of Phosphorescent Triplet States via Photoinduced Electron Transfer: Energy and Electron Transfer Dynamics in Pt Porphyrin–Rhodamine B Dyads

2012

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Control over generation and dynamics of excited electronic states is fundamental to their utilization in all areas of technology. We present the first example of multichromophoric systems in which emissive triplet states are generated via a pathway involving photoinduced electron transfer (ET), as opposed to local intrachromophoric processes. In model dyads, PtP-Phn-pRhB+ (1-3, n=1-3), comprising platinum(II) meso-tetraarylporphyrin (PtP) and rhodamine B piperazine derivative (pRhB+), linked by oligo-p-phenylene bridges (Phn), upon selective excitation of pRhB+ at a frequency below that of the lowest allowed transition of PtP, room-temperature T1→S0 phosphorescence of PtP was observed. The pathway leading to the emissive PtP triplet state includes excitation of pRhB+, ET with formation of the singlet radical pair, intersystem crossing within that pair and subsequent radical recombination. Due to the close proximity of the triplet energy levels of PtP and pRhB+, reversible triplet-triplet (TT) energy transfer between these states was observed in dyads 1 and 2. As a result, the phosphorescence of PtP was extended in time by the long decay of the pRhB+ triplet. Observation of ET and TT in the same series of molecules enabled direct comparison of the distance attenuation factors β between these two closely related processes.

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Section: Introductionmentioning

confidence: 99%

Generation of Phosphorescent Triplet States via Photoinduced Electron Transfer: Energy and Electron Transfer Dynamics in Pt Porphyrin–Rhodamine B Dyads

2012

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“…This behavior was also seen experimentally in many studies analyzing the upconverted fluorescence intensity upon varying the pump intensity. 2,5,50,51,60,61 The fact that Δ J SC (⊙) is sub-quadratic already beyond 3–5 ⊙ indicates that the TTA efficiency of the UC system is beginning to saturate. 27 The comparison to the simulated QY from Fig.…”

Section: Resultsmentioning

confidence: 99%

Increased upconversion performance for thin film solar cells: a trimolecular composition

et al. 2016

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“…They are used as light harvesters in dye-sensitized solar cells [2][3][4], luminescent emitters in light-emitting electrochemical cells [5][6][7], potential anticancer and imaging agents in phototherapy [8][9][10], sensors for ions [11][12][13][14][15][16] and small molecules [17,18], photocatalysts for water splitting [19,20], hydrogen production [21][22][23][24], CO 2 reduction [21,23,25], and many other chemical reactions [23,[26][27][28][29], components in mixed valence systems [30][31][32][33][34][35], light upconversion systems [36][37][38][39] and molecular memory devices [40][41][42].…”

Section: Synthesis and Characterization Of Ruthenium(ii) Complexes Inmentioning

confidence: 99%

Synthesis and characterization of ruthenium(II) complexes incorporating 4′-phenyl-terpyridine and triphenylphosphine

Moya

López

Pérez-Zúñiga

et al. 2015

Journal of Coordination Chemistry

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The syntheses of two new series of ruthenium(II) complexes incorporating substituted 4′-phenylterpyridine, triphenylphosphine and chloride (A Series) or hydride (B Series) are reported. In both series 4′-phenyl-terpyridine incorporated substituents of varying electronic character at the 4-position: 4`-(4-chlorophenyl)-2,2´:6´,2``-terpyridine (ClPh-tpy); 4`-(4-nitrophenyl)-2,2´:6´,2``-terpyridine (NO 2 Ph-tpy) and 4`-(4-methoxyphenyl)-2,2´:6´,2``-terpyridine (OMePh-tpy). The complexes have been characterized by elemental analysis and UV-Vis, IR and NMR spectroscopy and their electrochemical properties studied. The substituents on the 4′-phenylterpyridine ligand influence the properties of the metal center. For all complexes prepared, λ max of a characteristic low energy band in the UV-Vis spectrum was found to move to shorter wavelengths as the solvent polarity increased (a hypsochromic shift). For the B series complexes, the low energy band was broader and undergoes a small shift to lower frequencies as a result of the substitution of chloride by a hydride. The 1 H-and 31 P-NMR spectra clearly indicate that the geometry of the 4′-phenyl-terpyridine ligand is meridional in the complexes, with the two triphenylphosphines trans to each other. Upon optimization of the experimental procedures the yields increased to 70% for the B series complexes.

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Energy Up‐Conversion by Low‐Power Excitation: New Applications of an Old Concept

Cited by 162 publications

References 17 publications

Generation of Phosphorescent Triplet States via Photoinduced Electron Transfer: Energy and Electron Transfer Dynamics in Pt Porphyrin–Rhodamine B Dyads

Generation of Phosphorescent Triplet States via Photoinduced Electron Transfer: Energy and Electron Transfer Dynamics in Pt Porphyrin–Rhodamine B Dyads

Increased upconversion performance for thin film solar cells: a trimolecular composition

Synthesis and characterization of ruthenium(II) complexes incorporating 4′-phenyl-terpyridine and triphenylphosphine

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