Delayed fluorescence from a zirconium(iv) photosensitizer with ligand-to-metal charge-transfer excited states

Zhang, Yu; Lee, Tia S.; Favale, Joseph M.; Leary, Dylan C.; Petersen, Jeffrey L.; Scholes, Gregory D.; Castellano, Felix N.; Milsmann, Carsten

doi:10.1038/s41557-020-0430-7

Cited by 180 publications

(238 citation statements)

References 45 publications

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“…Thermally activated delayed fluorescence (TADF) is a very promising mechanism to harvest singlet and triplet excitons, [1–5] in which excitons from a long‐lived triplet excited state get back to the singlet excited state via reverse intersystem crossing (RISC). In the past decade, TADF has been widely studied for designing high‐performance organic light emitting diodes (OLEDs) [1–3] . In general, TADF is facilitated by a small energy separation between the lowest excited triplet states T 1 and the lowest excited singlet states S 1 (Δ E (S 1 ‐T 1 ), (typically <0.2 eV)) [2, 3] .…”

Section: Figurementioning

confidence: 99%

“…In the past decade, TADF has been widely studied for designing high‐performance organic light emitting diodes (OLEDs) [1–3] . In general, TADF is facilitated by a small energy separation between the lowest excited triplet states T 1 and the lowest excited singlet states S 1 (Δ E (S 1 ‐T 1 ), (typically <0.2 eV)) [2, 3] . The spatial separation of the highest occupied and lowest unoccupied molecular orbitals (HOMO and LUMO) is beneficial to realize small Δ E (S 1 ‐T 1 ) [5, 6] .…”

Section: Figurementioning

confidence: 99%

“…The temperature dependent PL lifetimes ( τ ave ) are shown in Figure 2 e. Fitting of the plot of τ ave vs. temperature ( T ) is carried out by using a TADF model: [3, 7]

true τ_{normala normalv normale} = \frac{3 + \exp (() - \frac{Δ E (S_{1} - T_{1})}{k_{normalB} T})}{3 / τ_{T} + 1 / τ_{S} e x p (() - \frac{Δ E (S_{1} - T_{1})}{k_{B} T})}

…”

Section: Figurementioning

confidence: 99%

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Efficient Thermally Activated Delayed Fluorescence from All‐Inorganic Cesium Zirconium Halide Perovskite Nanocrystals

et al. 2020

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Thermally activated delayed fluorescence (TADF) is generally observed in solid-state organic molecules or metalorganic complexes. However, TADF in all-inorganic colloidal nanocrystals (NCs) is rare. Herein, we report the first colloidal synthesis of an air-stable all-inorganic lead-free Cs 2 ZrCl 6 perovskite NCs. The Cs 2 ZrCl 6 NCs exhibit long-lived triplet excited state (138.2 ms), and feature high photoluminescence (PL) quantum efficiency (QY = 60.37 %) due to TADF mechanism. The emission color can be easily tuned from blue to green by synthesizing the mixed-halide Cs 2 ZrBr x Cl 6Àx (0 x 1.5) NCs. Femtosecond transient absorption and temperature dependent PL measurements are performed to clarify the emission mechanism. In addition, Bi 3+ ions are successfully doped into Cs 2 ZrCl 6 NCs, which further extends the PL properties. This work not only develops a new lead-free halide perovskite NCs for potential optoelectronic applications, but also offers unique strategies for developing new inorganic phosphors.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Efficient Thermally Activated Delayed Fluorescence from All‐Inorganic Cesium Zirconium Halide Perovskite Nanocrystals

et al. 2020

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“…The temperature dependent PL lifetimes ( τ ave ) are shown in Figure 2 e. Fitting of the plot of τ ave vs. temperature ( T ) is carried out by using a TADF model: [3, 7]

true τ_{normala normalv normale} = \frac{3 + \exp (() - \frac{Δ E (S_{1} - T_{1})}{k_{normalB} T})}{3 / τ_{T} + 1 / τ_{S} e x p (() - \frac{Δ E (S_{1} - T_{1})}{k_{B} T})}

…”

Section: Figurementioning

confidence: 99%

Efficient Thermally Activated Delayed Fluorescence from All‐Inorganic Cesium Zirconium Halide Perovskite Nanocrystals

et al. 2020

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“…1). The pyridine dipyrrolide is a particularly attractive ligand framework, as several examples of pyridine dipyrrolide pincers with different substituents on the ligand backbone (e.g., Me, t-Bu, Ph, Mes) are known and have already been successfully used with both early and late transition-metal ions such as Ti (Zhang et al, 2016), Zr (Zhang et al, 2016(Zhang et al, , 2020, Cr (Gowda et al, 2018), Mo (Gowda et al, 2018), Fe (Sorsche et al, 2020;Hakey et al, 2019), Co (Grant et al, 2016), Pt (Komine et al, 2014), Pd (Yadav et al, 2018) and Zn (Komine et al, 2014) to form well-defined metal complexes.…”

Section: Chemical Contextmentioning

confidence: 99%

Nickel(II) carbonyl, ammonia, and acetonitrile complexes supported by a pyridine dipyrrolide pincer ligand

Dias

Pramanik

2020

Acta Cryst E

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The synthesis, isolation and crystal structures of nickel(II) carbonyl, acetonitrile and ammonia complexes supported by a dianionic, pyridine dipyrrolide pincer ligand [pyrr2py]2−, namely, carbonyl[2,2′-(pyridine-2,6-diyl)bis(3,5-di-p-tolylpyrrolido-κN)]nickel(II), [Ni(C41H33N3)(CO)], ammine[2,2′-(pyridine-2,6-diyl)bis(3,5-di-p-tolylpyrrolido-κN)]nickel(II), [Ni(C41H33N3)(NH3)], and (acetonitrile-κN)[2,2′-(pyridine-2,6-diyl)bis(3,5-di-p-tolylpyrrolido-κN)]nickel(II), [Ni(C41H33N3)(CH3CN)], as well as the free ligand 2,6-bis(3,5-di-p-tolylpyrrol-2-yl)pyridine, C41H35N3 or [pyrr2py]H2 are reported. The nickel complexes are four-coordinate and adopt a square-planar geometry. The CO stretch of the nickel-bound carbon monoxide ligand of [pyrr2py]Ni(CO) has been observed at 2101 cm−1. The ammonia and acetonitrile complexes, [pyrr2py]Ni(NH3) and [pyrr2py]Ni(NCMe) feature all-nitrogen coordination spheres around nickel consisting of different N-donor ligand types.

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Delayed fluorescence from a zirconium(iv) photosensitizer with ligand-to-metal charge-transfer excited states

Cited by 180 publications

References 45 publications

Efficient Thermally Activated Delayed Fluorescence from All‐Inorganic Cesium Zirconium Halide Perovskite Nanocrystals

Efficient Thermally Activated Delayed Fluorescence from All‐Inorganic Cesium Zirconium Halide Perovskite Nanocrystals

Efficient Thermally Activated Delayed Fluorescence from All‐Inorganic Cesium Zirconium Halide Perovskite Nanocrystals

Nickel(II) carbonyl, ammonia, and acetonitrile complexes supported by a pyridine dipyrrolide pincer ligand

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