White‐Light Emission from an Assembly Comprising Luminescent Iridium and Europium Complexes

Coppo, Paolo; Duati, Marco; Kozhevnikov, Valery N.; Hofstraat, Johannes W.; Cola, Luisa De

doi:10.1002/anie.200461953

Cited by 359 publications

(183 citation statements)

References 25 publications

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“…These characteristics enable them to have wide application in responsive luminescent stains for biomedical analysis with temporal and spectral discrimination, [1][2][3][4][5][6][7][8][9] and to find use in development for liquid-crystal displays, [10][11][12][13] laser materials [14][15] and optoelectronic emitters. [16][17] Generally, the excellent luminescence properties of lanthanide complexes are attributed to the intramolecular energy transfer between the organic ligands and chelated metal ("antenna effect").…”

Section: Introductionmentioning

confidence: 99%

Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

Yang

Liu

et al. 2008

ChemPhysChem

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The photophysical properties of lanthanide complexes have been studied extensively; however, fundamental parameters such as the intrinsic quantum yield as well as radiative and nonradiative decay rates are difficult or even impossible to measure experimentally. Herein, a photoacoustic (PA) method is proposed to determine the intrinsic quantum yield of lanthanide complexes with lifetimes in the order of milliseconds. This method is used to determine the intrinsic quantum yields for europium(III)‐containing metallomesogens as well as terbium(III) complexes. The results show that the PA signal is sensitive to both the lifetime and the ratio of the fast‐to‐slow heat component of the samples. It is found that there is an efficient ligand sensitization and a moderate intrinsic quantum yield for the complexes. The intrinsic quantum yield of Eu3+ in the metallomesogens exhibits an obvious increase upon the isotropic liquid to smectic A transition. The proposed PA method is quite simple, and can contribute to a clearer understanding of the photophysical processes in luminescent lanthanide complexes.

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Section: Introductionmentioning

confidence: 99%

Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

Yang

Liu

et al. 2008

ChemPhysChem

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“…Therefore, the development of a white lightemitting phosphorescent single transition-metal complex is very much desired. Multinuclear complexes 6 or excimers 7 have been designed for such a purpose. However, despite being single molecules, those approaches still rely on the combination of two emitting centers, which is expected to show color drift over time.…”

mentioning

confidence: 99%

White-light phosphorescence emission from a single molecule: application to OLED

Bolink

Angelis²,

Baranoff

et al. 2009

Chem. Commun.

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A simple mononuclear cyclometallated iridium(III) complex exhibits white photo-and electro-luminescence in the wavelength range from 440 to 800 nm, which originates from a single emitting excited state of mixed character.Organic light emitting diodes (OLEDs) are recently proposed as one of the most appealing solutions for low energy consumption solid-state lighting. 1 To date organic white light-emitting devices (WOLEDs) are obtained by combining the emission from red, green and blue or sky-blue and orange emitters. The combination of these emitters can be achieved by the deposition of multiple layers on top of each other, 2 by mixing them into one single emitting layer, 3 combinations of the two techniques, 4 and by combining them into polymeric structures. 5 These approaches require more complex device architectures and production processes compared to singleemitter based OLEDs, which has so far greatly hindered their market entry. Therefore, the development of a white lightemitting phosphorescent single transition-metal complex is very much desired. Multinuclear complexes 6 or excimers 7 have been designed for such a purpose. However, despite being single molecules, those approaches still rely on the combination of two emitting centers, which is expected to show color drift over time. In this paper, we describe a simple mononuclear organometallic complex that exhibits white photo-and electro-phosphorescence as a proof of concept demonstrating that WOLEDs with a single emitting center can be achieved. Theoretical calculations rationalize the reasons behind such broad emission, opening the way for generalization of this new strategy for WOLEDs development. Our result demonstrates that low-cost white light-emitting OLEDs with a single emitting center can be achieved.An usual synthetic route was used to prepare the complex (acetylacetonato)bis(1-methyl-2-phenylimidazole)iridium(III), hereafter labelled as N966 ( Fig. 1 and S1 (ESIw) for the crystal structure). The UV-Vis absorption spectrum of N966 in CH 2 Cl 2 solution at 298 K displays bands in the UV at 260, 284, 308, 348 and 376 nm, and the visible region at 408 and 454 sh nm due to intra-ligand (p-p*) and metal-to-ligand charge transfer transitions (MLCT), respectively (Fig. 1). When excited at 298 K within the ligand (p-p*) and MLCT absorption bands, the N966 complex shows a broad and almost unstructured emission covering the spectral range from 440 to 800 nm, with a maximum intensity at 570 nm, 8 a photoluminescence quantum yield (PLQY) of 0.015 and a radiative lifetime of (1.96 AE 0.1) ms over the entire spectrum ( Fig. S3 and S4, ESIw). The emission spectrum is independent of the excitation wavelength. Additionally, the excitation spectrum is independent of the probed wavelength (Fig. S5, ESIw). Finally, emission spectra measured at concentrations ranging from 10 À3 to 10 À7 M exhibit the same broad shape excluding the presence of an excimer (Fig. S6, ESIw). At 77 K, the emission becomes more structured with clear peaks at 469, 504 and 544 nm, as well a...

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“…Heterocycles predominantly containing nitrogen have been renowned as a class of auspicious and handy structures for the novel tetrazole chromophore design (e.g., pyridine tetrazole, bis-tetrazole pyridine, bipyridine tetrazole and terpyridine tetrazole ligands) [1][2][3][4][5][6][7] and synthesis of the elevated energy materials. Due to their higher thermal stability, higher heat of formation of these pyridine based derivatives found much imperative applications embracing the improvement of photoluminescent materials [8], protein crystallography [9] and immense variety of many other applications ranging from material science to medicinal field [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Novel Tetrazole Transition Metal Complexes for Advanced Photonic Applications

Malik¹,

Bhat²,

Yadav³

et al. 2018

Asian J. Chem.

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INTRODUCTIONHeterocycles predominantly containing nitrogen have been renowned as a class of auspicious and handy structures for the novel tetrazole chromophore design (e.g., pyridine tetrazole, bis-tetrazole pyridine, bipyridine tetrazole and terpyridine tetrazole ligands) [1][2][3][4][5][6][7] and synthesis of the elevated energy materials. Due to their higher thermal stability, higher heat of formation of these pyridine based derivatives found much imperative applications embracing the improvement of photoluminescent materials [8], protein crystallography [9] and immense variety of many other applications ranging from material science to medicinal field [10][11][12]. One of the most imperative and sensational applications of tetrazole based derivative as the pyridine tetrazole, which has been set up to display extensive appliances particularly in luminescent applications such as indicators, imaging and signal sensors [13,14].These tetrazole based derivatives can be used as a ligand in the configuration of eclectic range of complexes liable upon the nature of the central metal. Recently, lanthanide complexes equipped, which has publicized much more boosted photo luminescent property [15]. Correspondingly, the complexes

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White‐Light Emission from an Assembly Comprising Luminescent Iridium and Europium Complexes

Abstract: Red, white, and blue: White light was obtained by partial energy transfer (∂ET) between a blue‐emitting IrIII–phenylpyridine complex and a red‐emitting EuIII–terpyridine chelate through excitation of the assembly that is formed from the two metal complexes (see picture).

Cited by 359 publications

References 25 publications

Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

Listening to Lanthanide Complexes: Determination of the Intrinsic Luminescence Quantum Yield by Nonradiative Relaxation

White-light phosphorescence emission from a single molecule: application to OLED

Synthesis of Novel Tetrazole Transition Metal Complexes for Advanced Photonic Applications

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