Tuning the emission property of carbazole-caped cyclometalated platinum(II) complexes and its application for enhanced luminescent oxygen sensing

Wu, Wanhua; Wu, Wenting; Ji, Shaomin; Guo, Huimin; Zhao, Jianzhang

doi:10.1016/j.jorganchem.2011.03.002

Cited by 18 publications

(6 citation statements)

References 49 publications

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“…All solvents and reagents for synthesis were purchased from Aldrich or TCI and used as is unless otherwise stated. The intermediate 9,9-bis(n-butyl)-2-bromo-7-iodofluorene, 34 ligand L-1 24 and ligand L-2 35 were prepared according to the literature procedures. All the HPLC-grade solvents used for spectroscopic study were purchased from VWR International and were used without any further purification.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Pt(ii) diimine complexes bearing carbazolyl-capped acetylide ligands: synthesis, tunable photophysics and nonlinear absorption

et al. 2013

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A series of new Pt(II) diimine complexes with different carbazolyl-capped acetylide ligands (Pt-1–Pt-5) were synthesized and characterized. Their photophysical properties were investigated systematically via spectroscopic and theoretical methods. All complexes exhibit ligand-centered 1π,π* transitions in the UV region, and broad, structureless metal-to-ligand charge transfer (1MLCT)/ligand-to-ligand charge transfer (1LLCT) absorption bands in the visible spectral region. All complexes are emissive in solution at room temperature, with the emitting state being tentatively assigned to the 3MLCT/3LLCT states for Pt-1–Pt-4, and the emitting state of Pt-5 exhibiting a switch from the 3π,π* state in high-polarity solvents to the 3MLCT state in low-polarity solvents. Complexes Pt-1–Pt-5 all exhibit moderate triplet transient absorption (TA) from the visible to the NIR region, where reverse saturable absorption (RSA) could occur. The spectroscopic studies and theoretical calculations indicate that the photophysical properties of these Pt complexes can be tuned drastically by the carbazolyl-capped acetylide ligand, which would be useful for rational design of transition-metal complexes with high emission quantum yield, long excited-state lifetime, broadband excited-state absorption, and strong nonlinear transmittance for organic light-emitting and/or broadband nonlinear transmission applications.

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Section: Synthesis and Characterizationmentioning

confidence: 99%

Pt(ii) diimine complexes bearing carbazolyl-capped acetylide ligands: synthesis, tunable photophysics and nonlinear absorption

et al. 2013

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“…3). 13,14,30,31,36,37 The emission of Pt-4 is more sensitive to oxygen than the other complexes, indicating longer emission lifetime for Pt-4. 13,30,31,33 This is in agreement with the photophysical data of the complexes (Table 1).…”

Section: Absorption and Emission Spectramentioning

confidence: 99%

Tuning the photophysical properties of N^N Pt(ii) bisacetylide complexes with fluorene moiety and its applications for triplet–triplet-annihilation based upconversion

Guo

et al. 2012

J. Mater. Chem.

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“…[7, 18a, 33] Moreover, the lifetimes of the T 1 excited states of the normal Ir III complexes are short (usually less than 5.0 ms). [1, 8-12, 15, 18b, 19, 34, 35] We proposed that these photophysical processes could be enhanced by the longlived T 1 excited states, as has been demonstrated in luminescent oxygen sensing [36][37][38][39][40][41][42][43][44][45] and in triplet-triplet annihilation (TTA) upconversion. [43][44][45][46][47][48][49][50][51][52][53] Thus, the preparation of cyclometalated Ir III complexes with intense visible-light absorption and long-lived T 1 excited states is of great interest.…”

Section: Introductionmentioning

confidence: 99%

Long‐Lived Room‐Temperature Deep‐Red‐Emissive Intraligand Triplet Excited State of Naphthalimide in Cyclometalated Ir^III Complexes and its Application in Triplet‐Triplet Annihilation‐Based Upconversion

Sun

Zhao

2012

Chemistry A European J

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Cyclometalated Ir(III) complexes with acetylide ppy and bpy ligands were prepared (ppy = 2-phenylpyridine, bpy = 2,2'-bipyridine) in which naphthal (Ir-2) and naphthalimide (NI) were attached onto the ppy (Ir-3) and bpy ligands (Ir-4) through acetylide bonds. [Ir(ppy)(3)] (Ir-1) was also prepared as a model complex. Room-temperature phosphorescence was observed for the complexes; both neutral and cationic complexes Ir-3 and Ir-4 showed strong absorption in the visible range (ε=39,600 M(-1) cm(-1) at 402 nm and ε=25,100 M(-1) cm(-1) at 404 nm, respectively), long-lived triplet excited states (τ(T)=9.30 μs and 16.45 μs) and room-temperature red emission (λ(em)=640 nm, Φ(p)=1.4 % and λ(em)=627 nm, Φ(p)=0.3 %; cf. Ir-1: ε=16,600 M(-1) cm(-1) at 382 nm, τ(em)=1.16 μs, Φ(p)=72.6 %). Ir-3 was strongly phosphorescent in non-polar solvent (i.e., toluene), but the emission was completely quenched in polar solvents (MeCN). Ir-4 gave an opposite response to the solvent polarity, that is, stronger phosphorescence in polar solvents than in non-polar solvents. Emission of Ir-1 and Ir-2 was not solvent-polarity-dependent. The T(1) excited states of Ir-2, Ir-3, and Ir-4 were identified as mainly intraligand triplet excited states ((3)IL) by their small thermally induced Stokes shifts (ΔE(s)), nanosecond time-resolved transient difference absorption spectroscopy, and spin-density analysis. The complexes were used as triplet photosensitizers for triplet-triplet annihilation (TTA) upconversion and quantum yields of 7.1 % and 14.4 % were observed for Ir-2 and Ir-3, respectively, whereas the upconversion was negligible for Ir-1 and Ir-4. These results will be useful for designing visible-light-harvesting transition-metal complexes and for their applications as triplet photosensitizers for photocatalysis, photovoltaics, TTA upconversion, etc.

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Tuning the emission property of carbazole-caped cyclometalated platinum(II) complexes and its application for enhanced luminescent oxygen sensing

Cited by 18 publications

References 49 publications

Pt(ii) diimine complexes bearing carbazolyl-capped acetylide ligands: synthesis, tunable photophysics and nonlinear absorption

Pt(ii) diimine complexes bearing carbazolyl-capped acetylide ligands: synthesis, tunable photophysics and nonlinear absorption

Tuning the photophysical properties of N^N Pt(ii) bisacetylide complexes with fluorene moiety and its applications for triplet–triplet-annihilation based upconversion

Long‐Lived Room‐Temperature Deep‐Red‐Emissive Intraligand Triplet Excited State of Naphthalimide in Cyclometalated Ir^III Complexes and its Application in Triplet‐Triplet Annihilation‐Based Upconversion

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Tuning the emission property of carbazole-caped cyclometalated platinum(II) complexes and its application for enhanced luminescent oxygen sensing

Cited by 18 publications

References 49 publications

Pt(ii) diimine complexes bearing carbazolyl-capped acetylide ligands: synthesis, tunable photophysics and nonlinear absorption

Pt(ii) diimine complexes bearing carbazolyl-capped acetylide ligands: synthesis, tunable photophysics and nonlinear absorption

Tuning the photophysical properties of N^N Pt(ii) bisacetylide complexes with fluorene moiety and its applications for triplet–triplet-annihilation based upconversion

Long‐Lived Room‐Temperature Deep‐Red‐Emissive Intraligand Triplet Excited State of Naphthalimide in Cyclometalated IrIII Complexes and its Application in Triplet‐Triplet Annihilation‐Based Upconversion

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Long‐Lived Room‐Temperature Deep‐Red‐Emissive Intraligand Triplet Excited State of Naphthalimide in Cyclometalated Ir^III Complexes and its Application in Triplet‐Triplet Annihilation‐Based Upconversion