Room temperature long-lived triplet excited state of fluorescein in N^N Pt(II) bisacetylide complex and its applications for triplet–triplet annihilation based upconversions

Wu, Wenting; Zhao, Jianzhang; Wu, Wanhua; Chen, Yinghui

doi:10.1016/j.jorganchem.2012.05.010

Cited by 13 publications

(4 citation statements)

References 52 publications

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“…A wide variety of triplet PSs have been used as triplet energy donors in TTA upconversion; however, most of these compounds are either metal complexes , or organic compounds with heavy atoms or a spin converter. , Heavy-atom-free triplet PSs were rarely used. ,,, …”

Section: Resultsmentioning

confidence: 99%

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Spin–Orbit Charge-Transfer Intersystem Crossing of Compact Naphthalenediimide-Carbazole Electron-Donor–Acceptor Triads

et al. 2021

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Compact electron donor−acceptor triads based on carbazole (Cz) and naphthalenediimide (NDI) were prepared to study the spin−orbit charge-transfer intersystem crossing (SOCT-ISC). By variation of the molecular conformation and electron-donating ability of the carbazole moieties, the electronic coupling between the two units was tuned, and as a result charge-transfer (CT) absorption bands with different magnitudes were observed (ε = 4000−18 000 M −1 cm −1 ). Interestingly, the triads with NDI attached at the 3-C position or with a phenyl spacer at the N position of the Cz moiety, thermally activated delayed fluorescence (TADF) was observed. Femtosecond transient absorption (fs-TA) spectroscopy indicated fast electron transfer (0.8−1.5 ps) from the Cz to NDI unit, followed by population of the triplet state (150−600 ps). Long-lived triplet states (up to τ T = 45−50 μs) were observed for the triads. The solvent-polarity-dependent singlet-oxygen quantum yield (Φ Δ ) is 0−26%. Timeresolved electron paramagnetic resonance (TREPR) spectral study of TADF molecules indicated the presence of the 3 CT state for NDI-Cz-Ph (zero-field-splitting parameter D = 21 G) and an 3 LE state for NDI-Ph-Cz (D = 586 G). The triads were used as triplet photosensitizers in triplet−triplet annihilation upconversion by excitation into the CT absorption band; the upconversion quantum yield was Φ UC = 8.2%, and there was a large anti-Stokes shift of 0.55 eV. Spatially confined photoexcitation is achieved with the upconversion using focusing laser beam excitation, and not the normally used collimated laser beam, i.e., the upconversion was only observed at the focal point of the laser beam. Photo-driven intermolecular electron transfer was demonstrated with reversible formation of the NDI −• radical anion in the presence of the sacrificial electron donor triethanolamine.

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Section: Resultsmentioning

confidence: 99%

“…Similarly for NDI-Ph-Cz, an electron transfer can take place from the carbazole to NDI moiety (800 fs), followed by ISC (145 ps). The TREPR spectroscopy of the triads revealed the nature of the triplet state, i.e., a 3 82,83 or organic compounds with heavy atoms or a spin converter. 84,85 Heavy-atom-free triplet PSs were rarely used.…”

Section: Resultsmentioning

confidence: 99%

Spin–Orbit Charge-Transfer Intersystem Crossing of Compact Naphthalenediimide-Carbazole Electron-Donor–Acceptor Triads

et al. 2021

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“…A high QE UC of 14.1% was measured for Pt-3&DPA in toluene ( c Pt‑3 = 1.0 × 10 –5 M, c DPA = 1.32 × 10 –4 M) . Similarly, Pt-4 containing ethynylpyrene, Pt-5 containing difluoroboron, Pt-6 and Pt-7 containing naphthalenediimide, , Pt-8 containing fluorescein, Pt-9, Pt-10, and Pt-11 bearing fluorine-containing acetylide ligands appended to naphthyl, pyrenyl, and naphthalenediimide moieties, , respectively, could be successfully used as sensitizers for TTA-based upconversion. Of particular note is the fact that Pt-9 proved to be weakly phosphorescent, but it could still be used for the highly efficient sensitizing upconversion emission of DPA.…”

Section: Components Of Tta-based Upconversion Systemsmentioning

confidence: 99%

Upconversion Luminescent Materials: Advances and Applications

et al. 2014

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Assessment of TTA-Based UCNPs 441 9. Detection Applications of Lanthanide UCNPs 441 9.1. Lanthanide UCNPs as Nanothermometers 441 9.2. Upconversion Detection Based on the Inner Filter Effect 442 9.2.1. Lanthanide UCNPs as pH Sensors 442 9.2.2. Lanthanide UCNPs as CO 2 or Ammonia Probes 442 9.2.3. Lanthanide UCNPs as a Cr 6+ Probe 442 9.2.4. Lanthanide UCNPs as Probes for Antioxidants 442 9.3. Design Strategy for Upconversion LRET Detection 442 9.4. Upconversion LRET Detection by Alteration of the Spectral Overlap between Donor and Acceptor 444 9.4.1. Lanthanide UCNPs as CN − Probe 444 9.4.2. Lanthanide UCNPs as a NO 2 − Probe 444 9.4.3. Lanthanide UCNPs as a Cu 2+ Probe 444 9.4.4. Lanthanide UCNPs as Hg 2+ and MeHg + Probes 444 9.4.5. Lanthanide UCNPs as an Oxygen Probe 445 9.4.6. Lanthanide UCNPs as a pH Probe 445 9.4.7. Lanthanide UCNPs as a GSH Probe 445 9.5. UC-LRET Detection by Alteration of the Distance between Donor and Acceptor 445 9.5.1. Lanthanide UCNPs for DNA/RNA Detection 445 9.5.2. Lanthanide UCNPs for Immunoassay 446 9.5.3. Lanthanide UCNPs as Luminescent Probes Based on Ligand−Acceptor Interaction 446 9.5.4. Lanthanide UCNPs as Enzyme-Activity Assay 447 9.5.5. Lanthanide UCNPs as an ATP Probe 447 9.5.6. Lanthanide UCNPs as Hg 2+ Probe 447 9.6. Summary of Upconversion Detection Systems 447 10. Upconversion Materials as a Lighting Source 448 10.1. Solid-State TTA-Based Upconversion Film for Lighting 448 10.1.1. Co-doping Both Sensitizer and Annihilator into a Polymer Matrix 448 10.1.2. Doping the Sensitizer in an Emissive Polymer Matrix 448 10.1.3. TTA-Based Upconversion Luminescence in Nanocrystalline ZrO 2 Films 449 10.1.4. TTA-Based Upconversion Luminescence in Nanofibers and Mats 449 10.2. Lanthanide UCNPs for Lighting 449 10.3. TTA-Based Upconversion Materials for Color-Display Devices 449 10.4. Lanthanide UCNPs for Anticounterfeiting Applications 449 10.5. Lanthanide UCNPs for Fingermark Detection 449 10.6. Lanthanide UCNPs s for 3D-Displays 449 11. Upconversion Materials as a Second Excitation Source 450 11.1. Upconversion Materials for Photocurrent Generation 450 11.1.1. Lanthanide UCNPs for Photocurrent Generation 450 11.1.2. TTA-Based Upconversion Materials for Photocurrent Generation 450 11.1.3. Lanthanide UCNPs for Solar Cells 450 11.1.4. TTA-Based Upconversion Materials for Solar Cells 451 11.2. Upconversion Materials for Photocatalysis 451 11.2.1. Lanthanide UCNPs for Photocatalysis 451 11.2.2. TTA-Based Upconversion for Photocatalysis 451 11.3. Upconversion Materials for Solar Fuels 451 11.4. Upconversion Materials for Photoisomerization 451 11.4.1. Lanthanide UCNPs for Photoisomerization of Diarylethenes 451 455 Abbreviations 455 References 456

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“…A dbbpy Pt(II) bisfluorescein acetylide complex (Pt-11) was used as the triplet sensitizer for TTA-based upconversion with the acceptor DPA. When excited by blue laser λ ex ¼ 473 nm (5 mW), the upconversion quantum yield was 10.7 % [56]. In order to investigate the influence of ligands on photophysical properties of N^N Pt(II) bisacetylide complexes, a series of fluorene-containing aryl acetylide ligands were used to the synthesis of N^N Pt(II) bisacetylide complexes, where aryl substituents on the fluorene were phenyl (Pt-12), naphthol (Pt-13), anthranyl (Pt-14), pyrenyl (Pt-15), 4-diphenylaminophenyl (Pt-16), and 9,9-di-noctylfluorene (Pt-17).…”

Section: A-16mentioning

confidence: 99%

Transition-Metal Complexes for Triplet–Triplet Annihilation-Based Energy Upconversion

Zhang

Yang

Liu

et al. 2015

Green Chemistry and Sustainable Technology

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In recent years, significant progress has been achieved in the field of triplet-triplet annihilation (TTA)-based energy upconversion, in which transitionmetal complexes as the sensitizers play a key role. These complexes are different from organic fluorophores because the triplet excited states, instead of the singlet excited states, are populated with a high intersystem crossing (ISC) efficiency upon photoexcitation. Meanwhile, the long-lived triplet excited states in the microsecond range are observed for these complexes. All these properties are favorable when transition-metal complexes, including Ir(III), Pd(II), Pt(II), Ru(II), Zn(II), Re(I), Cu(I), and Au(III) complexes summarized herein, are used as sensitizers for TTA upconversion. Moreover, some examples of organic sensitizers and the applications of TTA upconversion systems are also summarized.

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Room temperature long-lived triplet excited state of fluorescein in N^N Pt(II) bisacetylide complex and its applications for triplet–triplet annihilation based upconversions

Cited by 13 publications

References 52 publications

Spin–Orbit Charge-Transfer Intersystem Crossing of Compact Naphthalenediimide-Carbazole Electron-Donor–Acceptor Triads

Spin–Orbit Charge-Transfer Intersystem Crossing of Compact Naphthalenediimide-Carbazole Electron-Donor–Acceptor Triads

Upconversion Luminescent Materials: Advances and Applications

Transition-Metal Complexes for Triplet–Triplet Annihilation-Based Energy Upconversion

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