Abstract
We have proposed a novel concept of a pressure sensor called electroluminescent pressure sensor (ELPS) based on oxygen quenching of electroluminescence. The sensor was fabricated as an organic light-emitting device (OLED) with phosphorescent dyes whose phosphorescence can be quenched by oxygen molecules, and with a polymer electrode which permeates oxygen molecules. The sensor was a single-layer OLED with Platinum (II) octaethylporphine (PtOEP) doped into poly(vinylcarbazole) (PVK) as an oxygen sensitive emissive layer and poly(3,4-ethylenedioxythiophene) mixed with poly(styrenesulfonate) (PEDOT:PSS) as an oxygen permeating polymer anode. The pressure sensitivity of the fabricated ELPS sample was equivalent to that of the sensor excited by an illumination light source. Moreover, the pressure sensitivity of the sensor is equivalent to that of conventional pressure-sensitive paint (PSP), which is an optical pressure sensor based on photoluminescence.
Highlights
Optical measurement techniques based on oxygen quenching of photoluminescence, such as pressure-sensitive paints (PSP) [1,2,3,4] and fiber-optic sensors [5], have received much attention due to the fact that the techniques enable us to measure pressure distribution or oxygen concentration with high spatial resolution
The oxygen concentration sensitivity corresponds to the pressure sensitivity in this formula [4]
We proposed a novel concept of a pressure sensor called electroluminescent pressure sensor (ELPS)
Summary
Optical measurement techniques based on oxygen quenching of photoluminescence, such as pressure-sensitive paints (PSP) [1,2,3,4] and fiber-optic sensors [5], have received much attention due to the fact that the techniques enable us to measure pressure distribution or oxygen concentration with high spatial resolution. The measurement system needs optical windows or optical fibers to transmit UV light for photo-excitation. This restriction makes the measurement system costly and sometimes complex. Since a signal is proportional to the intensity of an illumination light, the non-uniformity of the signal to noise ratio (SNR) due to the non-uniformity of an illumination cannot be compensated even with the above-mentioned procedure. This makes the assessment of measurement error or the uncertainty analysis difficult, because it is difficult to measure the distribution of illumination intensity. A photo-detector has to be equipped with an optical filter to eliminate the scattering of an illumination light, which is stronger than the luminescence, and this results in reducing the luminescence and SNR detected by a photo-detector
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