Copper(<scp>i</scp>) complexes as alternatives to iridium(<scp>iii</scp>) complexes for highly efficient oxygen sensing

Medina‐Rodríguez, Santiago; Orriach-Fernández, F.J.; Poole, Christopher; Kumar, Prashant; Torre, Ángel de la; Fernández-Sánchez, Jorge F.; Baranoff, Etienne; Fernández‐Gutiérrez, Alberto

doi:10.1039/c5cc04326c

Cited by 26 publications

(18 citation statements)

References 31 publications

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“…Several other dyes including cyclometalated iridium Borisov & Klimant, 2007;Köse, et al, 2005;Li, et al, 2015), lanthanide Borisov, et al, 2014;Law, et al, 2009;Songzhu, et al, 2010) and other metal complexes (Medina-Rodriguez, et al, 2015) have also been described for O 2 sensing. Noble or rare metal free organic chromophores such as, camphorquinone (Charlesworth, 1994), erythrosine B (Gillanders, et al, 2004;Lam, Chan, & Lo, 2001), BODIPY derivatives (Banerjee, et al, 2015;Ermolina, et al, 2014) also exhibit phosphorescence at room temperature effectively quenched by O 2 , but these dyes are associated with lower wavelength excitation, low brightness, considerable photodecomposition.…”

Section: O 2 -Sensitive Dyesmentioning

confidence: 99%

High throughput non-destructive assessment of quality and safety of packaged food products using phosphorescent oxygen sensors

Banerjee

Kelly

Kerry

et al. 2016

Trends in Food Science & Technology

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Intelligent and active packaging technologies have gained attention in recent time due to increased demand by the consumers and manufacturers for sustaining the quality and safety of food products, improved shelf-life as well as real time monitoring of the packaging, storage and handling processes. In this context, phosphorescence based sensors for molecular oxygen (O 2) are important tools for monitoring of packaged products, new product development and optimisation. They allow fast, reversible, real-time and quantitative monitoring of residual O 2 levels in a non-destructive manner, being superior over alternative systems. In this review, we describe the main types of phosphorescent O 2-sensitive materials, fabrication methods and general requirements for sensors for food packaging applications. The main developments and representative examples are provided which illustrate the application of such sensors for monitoring of gaseous and dissolved O 2 in various types of packaged foods and beverages. We also compare commercial O 2 sensing instrumentation and disposable O 2 sensors currently in use.

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Section: O 2 -Sensitive Dyesmentioning

confidence: 99%

High throughput non-destructive assessment of quality and safety of packaged food products using phosphorescent oxygen sensors

Banerjee

Kelly

Kerry

et al. 2016

Trends in Food Science & Technology

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“…The three Ir(III) dyes were immobilised in polystyrene (PS) and in a porous aluminium oxide solid support (AP200/19) 23,24,58 chosen for its excellent performance as supporting matrix for dyes for sensing traces of oxygen in gas. 32,59 They have been characterized by intensity measurements and the Ir(III) dye showing the best analytical performances (Ir2) was also characterised by multifrequency phase-resolved luminescence using a short duty cycle rectangular-wave as the excitation signal. 60 The variations of the luminescence intensity with the oxygen concentration as well as the Stern-Volmer plots for Ir2-AP200/19 and Ir2-PS are shown in Fig.…”

Section: Oxygen Sensingmentioning

confidence: 99%

High performance optical oxygen sensors based on iridium complexes exhibiting interchromophore energy shuttling

Medina‐Rodríguez

Denisov

Cudré

et al. 2016

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A doubly pyrene-grafted bis-cyclometallated iridium complex with engineered electronically excited states demonstrates reversible electronic energy transfer between adjacent chromophores giving rise to extremely long-lived red luminescence in solution (τ = 480 μs). Time-resolved spectroscopic studies afforded determination of pertinent photophysical parameters including rates of energy transfer and energy distribution between constituent chromophores in the equilibrated excited molecule (ca. 98% on the organic chromophores). Incorporation into a nanostructured metal-oxide matrix (AP200/19) gave highly sensitive O2 sensing films, as the detection sensitivity was 200-300% higher than with the commonly used PtTFPP and approaches the sensitivity of the best O2-sensing dyes reported to date.

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“…The potential use of Cu(I) complexes for commercial applications, especially, in the fields of light generation by electroluminescence, such as organic light emitting diodes (OLEDs) [1][2][3][4][5][6] and light emitting electrochemical cells (LEECs) [7][8][9][10][11][12], as well as in the areas of sensing of oxygen or temperature [13][14][15][16][17][18][19] and as photocatalysts [20][21][22][23][24][25][26] strongly stimulated scientific and fundamental research in recent years. This did not only lead to a much deeper understanding of photophysical and chemical properties of the Cu(I) compounds, but led also to the development of an enormous number of new materials with strongly improved properties, for example, with respect to an application as OLED emitters.…”

Section: Introductionmentioning

confidence: 99%

Cu(I) complexes – Thermally activated delayed fluorescence. Photophysical approach and material design

Czerwieniec

Leitl

Homeier

et al. 2016

Coordination Chemistry Reviews

490

653

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Cu(I) complexes often show transitions of distinct metal-to-ligand charge transfer (MLCT) character. This can lead to small energy separations between the lowest singlet S1 and triplet T1 state. Hence, thermally activated delayed fluorescence (TADF) and, if applied to electroluminescent devices, singlet harvesting can become highly effective. In this contribution, we introduce the TADF mechanism and identify crucial parameters that are necessary to optimize materials' properties, in particular, with respect to short emission decay times and high quantum yields at ambient temperature. In different case studies, we present a photophysical background for a deeper understanding of the materials' properties. Accordingly, we elucidate strategies for obtaining high quantum yields. These are mainly based on enhancing the intrinsic rigidity of the complexes and of their environment. Efficient TADF essentially requires small energy separations E(S1-T1) with preference below about 1000 cm 1 (≈ 120 meV). This is achievable with complexes that exhibit small spatial HOMO-LUMO overlap. Thus, energy separations below 300 cm 1 (≈ 37 meV) are obtained, giving short radiative TADF decay times of less than 5 s. In a case study, it is shown that the TADF properties may be tuned or the TADF effect can even be turned off. However, very small E(S1-T1) energy separations are related to small radiative rates or small

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Copper(i) complexes as alternatives to iridium(iii) complexes for highly efficient oxygen sensing

Cited by 26 publications

References 31 publications

High throughput non-destructive assessment of quality and safety of packaged food products using phosphorescent oxygen sensors

High throughput non-destructive assessment of quality and safety of packaged food products using phosphorescent oxygen sensors

High performance optical oxygen sensors based on iridium complexes exhibiting interchromophore energy shuttling

Cu(I) complexes – Thermally activated delayed fluorescence. Photophysical approach and material design

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