A luminescence lifetime-based capillary oxygen sensor utilizing monolithically integrated organic photodiodes

Lamprecht, Bernhard; Tschepp, Andreas; Čajlaković, Merima; Sagmeister, Martin; Ribitsch, Volker; Köstler, Stefan

doi:10.1039/c3an00208j

Cited by 13 publications

(10 citation statements)

References 22 publications

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“…Only very recently, a capillary oxygen sensor was described that is based on luminescence lifetime measurements and utilizing monolithically integrated organic photodiodes. 638 Such sensors also may be considered as a kind of evanescent sensor as described in the following section.…”

Section: Developed a Disposablementioning

confidence: 99%

Optical methods for sensing and imaging oxygen: materials, spectroscopies and applications

2014

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We review the current state of optical methods for sensing oxygen. These have become powerful alternatives to electrochemical detection and in the process of replacing the Clark electrode in many fields. The article (with 694 references) is divided into main sections on direct spectroscopic sensing of oxygen, on absorptiometric and luminescent probes, on polymeric matrices and supports, on additives and related materials, on spectroscopic schemes for read-out and imaging, and on sensing formats (such as waveguide sensing, sensor arrays, multiple sensors and nanosensors). We finally discuss future trends and applications and summarize the properties of the most often used indicator probes and polymers. The ESI† (with 385 references) gives a selection of specific applications of such sensors in medicine, biology, marine and geosciences, intracellular sensing, aerodynamics, industry and biotechnology, among others.

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Section: Developed a Disposablementioning

confidence: 99%

Optical methods for sensing and imaging oxygen: materials, spectroscopies and applications

2014

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“…With a similar approach, Kӧstler and co-workers [84] demonstrated a PL-based capillary oxygen sensor. The sensing layer, comprised of a fluorescent dye embedded in a polymeric matrix, was homogeneously coated on the inner wall of a capillary tube exposed to a flowing analyte.…”

Section: Pl-based Chemical/biological Sensorsmentioning

confidence: 99%

Organic Photodetectors in Analytical Applications

et al. 2015

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This review focuses on the utilization of organic photodetectors (OPDs) in optical analytical applications, highlighting examples of chemical and biological sensors and lab-on-a-chip spectrometers. The integration of OPDs with other organic optical sensor components, such as organic light emitting diode (OLED) excitation sources and thin organic sensing films, presents a step toward achieving compact, eventually disposable all-organic analytical devices. We discuss recent advances in developing and integrating OPDs for various applications as well as challenges faced in this area.

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“…However, TiO 2 has a strong absorption in the UV (where the O 2 -sensitive dyes strongly absorb), which renders it less suitable for use with UV excitation, with a lower PL signal enhancement of 3× [13]. Hence, improvement of sensing films is still desired to produce stronger PL signals, especially at high [O 2 ] where the PL is massively quenched, and for compact sensors, where photodetectors (PDs) with no internal gain, such as Si-photodiodes or thin film-based inorganic and organic PDs, are used in structurally integrated sensors [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Oxygen and relative humidity monitoring with films tailored for enhanced photoluminescence

Cui

Manna

et al. 2015

Analytica Chimica Acta

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Approaches to generate porous or doped sensing films, which significantly enhance the photoluminescence (PL) of oxygen optical sensors, and thus improve the signal-to-noise (S/N) ratio, are presented. Tailored films, which enable monitoring the relative humidity (RH) as well, are also presented. Effective porous structures, in which the O2-sensitive dye Pt octaethylporphyrin (PtOEP) or the Pd analog PdOEP was embedded, were realized by first generating blend films of polyethylene glycol (PEG) with polystyrene (PS) or with ethyl cellulose (EC), and then immersing the dried films in water to remove the water-soluble PEG. This approach creates pores (voids) in the sensing films. The dielectric contrast between the films' constituents and the voids increases photon scattering, which in turn increases the optical path of the excitation light within the film, and hence light absorption by the dye, and its PL. Optimized sensing films with a PEG:PS ratio of 1:4 (PEG's molecular weight Mw ∼8000) led to ∼4.4× enhancement in the PL (in comparison to PS films). Lower Mw ∼200 PEG with a PEG:EC ratio of 1:1 led to a PL enhancement of ∼4.7×. Film-dependent PL enhancements were observed at all oxygen concentrations. The strong PL enhancement enables (i) using lower dye (luminophore) concentrations, (ii) reducing power consumption and enhancing the sensor's operational lifetime when using organic light emitting diodes (OLEDs) as excitation sources, (iii) improving performance when using compact photodetectors with no internal gain, and (iv) reliably extending the dynamic range. The effect of RH on O2 sensing is also presented. Dye:EC films are sensitive to the RH, as shown by the change of the dye's PL decay time with RH at a given O2 concentration. Surprisingly, this RH sensitivity vanishes by adding PEG to EC, including by washing PEG off. In contrast, doping EC with TiO2 nanoparticles maintains the RH effect with the advantage of significant PL enhancement. This enhancement enables differentiation of <10% changes in the RH, which is unattained with the dye:EC sensing films. The results are discussed in terms of the composition, thickness, and microstructure, whether porous or nanoparticle doped, of the composite films.

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A luminescence lifetime-based capillary oxygen sensor utilizing monolithically integrated organic photodiodes

Cited by 13 publications

References 22 publications

Optical methods for sensing and imaging oxygen: materials, spectroscopies and applications

Optical methods for sensing and imaging oxygen: materials, spectroscopies and applications

Organic Photodetectors in Analytical Applications

Oxygen and relative humidity monitoring with films tailored for enhanced photoluminescence

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