Structurally integrated luminescence based oxygen sensors with Organic LED/ oxygen sensitive dye and PECVD grown thin film photodetectors

摘要: There have been increasing efforts for the development of compact and miniaturized oxygen sensor various applications including multianalyte sensors with a reliable accurate monitoring concentration in controlled environments requiring measurements under low concentration. This work has devoted to structurally integrated luminescence quenching based sensors, structure comprising Organic Light Emitting Diode (OLED) as excitation source, sensitive dyes sensing element PECVD thin film photodiodes detection. The whole can also be extended towards on flexible substrates. developed is less cumbersome bulky easy use compared existing sensors. commonly used Clark electrode measuring dissolved suffers from interference ambient, requires frequent maintenance electrolyte change, consumes during measurement resulting little inaccurate hence restricts resolution sensor. In addition set-up very bulky, which further motivates these luminescence-based Another advantage ease tunability sensitivity different levels merely by changing dye. mainly appropriate film, temperature grown optimized best possible performance configuration. three component integration issues were solved overcoming all challenges due electromagnetic noise generated OLED, interfering photodiode response limiting sensitivity. Amorphous silicon/silicon germanium nanocrystalline silicon films characterized better photodiodes. spectrums engineered maximum around 640nm minimum 535nm, peak emission wavelength OLED. process resulted enhanced immunity background