Novel oxygen sensor based on terfluorene thin-film and its enhanced sensitivity by stimulated emission

Lin, Hsiao‐Yun; Huang, Meei-Feng; Chen, Yihong; Lin, Wei‐Chieh; Cheng, Hsing-Chieh; Wu, Chung‐Chih; Chao, Teng‐Chih; Wang, Ting-Chih; Wong, Ken‐Tsung; Tang, Kuo‐Chun; Chou, Pi‐Tai

doi:10.1039/c2jm30739a

Cited by 9 publications

(9 citation statements)

References 26 publications

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“…Our results are ascribed to oxygen induced reversible quenching, in agreement with previous results [6] on optical oxygen sensing exploiting PF8 SE, and with similar results on ASE quenching [9,10]. In order to quantitatively investigate the intensity quenching of SE and ASE and their excitation density dependence we determined the emission intensities in vacuum ( vac ) and in air ( air ), by integrating the spectra in the range 410-430 nm for SE and 441-449 nm for ASE.…”

Section: Resultssupporting

confidence: 75%

“…Moreover we observe that the relative quenching of both SE and ASE are clearly dependent on the excitation density. A similar ASE quenching decrease at high excitation density has been to date often observed in similar optical sensing experiments, but it has never been discussed in details [7][8][9][10]. As a first step in the understanding of this excitation density dependence we start by observing that the maximum ASE relative quenching is observed just above the ASE threshold, when the relative contribution of the background SE in the ASE intensity detection band is maximum.…”

Section: Resultsmentioning

confidence: 99%

“…A recent breakthrough in the sensitivity enhancement was represented by the demonstration that in neat active films showing optical gain, the Amplified Spontaneous Emission (ASE) and the laser intensity show a stronger relative quenching with respect to the Spontaneous Emission (SE) [7], exploited in efficient explosive vapours detection. This first result was followed by similar demonstration [8] of explosive detection in PF8 and in few evidences of oxygen detection [9,10].…”

Section: Introductionmentioning

confidence: 89%

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Excitation Density Dependence of Optical Oxygen Sensing in Poly(9,9-dioctylfluorene) Waveguides Showing Amplified Spontaneous Emission

Anni

Lattante

2014

ISRN Materials Science

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Reversible oxygen induced emission quenching of both the Spontaneous Emission (SE) and the Amplified Spontaneous Emission (ASE) of poly(9,9-dioctylfluorene) waveguides is demonstrated. We show that ASE shows a stronger quenching than SE, up to about 6.2 times, but also a stronger decrease when the excitation density increases. We conclude that the fast increase of the ASE decay rate is the main process in determining the ASE detection sensitivity, limiting the potentiality of sensitivity improvement of ASE with respect to SE.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

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Excitation Density Dependence of Optical Oxygen Sensing in Poly(9,9-dioctylfluorene) Waveguides Showing Amplified Spontaneous Emission

Anni

Lattante

2014

ISRN Materials Science

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“…Strongly fluorescent derivatives of coumarin were also used as OSPs in oxygen sensors, 144,145 but they are not strongly quenched by oxygen. Thin-films of a substituted terfluorene 146 have a fluorescence that was found to be quickly quenched by oxygen due to its specific morphology. Fast response ({100 ms), full reversibility and high efficiency are typical features.…”

Section: Luminescent Probes For Oxygenmentioning

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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“…Consequently, it could be inferred that the gain and threshold of stimulated emission in such films could be considerably upgraded if the molecules together with their transition dipole moments are suitably oriented with the polarization of stimulated emission, nevertheless without any luminescence quenching effects . Furthermore, the neat T3 film was found to exhibit remarkable and unique oxygen sensing properties (Figure a) . It was further inferred that the large S 1 –T 1 energy gap of T3 molecule, in addition to its amorphous properties in neat film led to the efficient sensitization of O 2 .…”

Section: Fluorescent Blue Materials: Oligofluorenes With Pure Hydrocamentioning

confidence: 91%

Development of Materials for Blue Organic Light Emitting Devices

Sarma

Wong

2019

The Chemical Record

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The success of organic light emitting diodes (OLED) has been witnessed by the commercialization of this technology for manufacturing the vivid and colorful displays used in our daily life now. The prospective growth of OLED technology on display industry will be optimistic. Over the last three decades, many different approaches on material and device designs have been implemented for improving the efficiency and stability of OLED devices. These efforts install main cornerstones to support the great achievement of OLED technology. However, until now, the performance and stability of blue OLEDs still have some concerns. This troublesome issue should be totally conquered before the large-scale manufactures dominated over other display technologies, particularly liquid crystal-based displays, takes place. Though significant progress has already been made to achieve high performance and long lifetime blue OLEDs, this topic still remains as one of the hot researches in OLEDs. We have been working on this area for about two decades and made some notable contributions. Consequently, in this personal account we have outlined our efforts to obtain better performing blue OLEDs by utilizing a range of emitters based on fluorescence, phosphorescence, delayed fluorescence and exciplex systems. We have also developed some novel host materials for blue OLEDs, which are worth mentioning in this account.Keywords: blue fluorescent emitter, phosphorescent complex, delayed fluorescence, exciplex, bipolar host materials [a] M.

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Novel oxygen sensor based on terfluorene thin-film and its enhanced sensitivity by stimulated emission

Cited by 9 publications

References 26 publications

Excitation Density Dependence of Optical Oxygen Sensing in Poly(9,9-dioctylfluorene) Waveguides Showing Amplified Spontaneous Emission

Excitation Density Dependence of Optical Oxygen Sensing in Poly(9,9-dioctylfluorene) Waveguides Showing Amplified Spontaneous Emission

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

Development of Materials for Blue Organic Light Emitting Devices

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