From Event: SPIE Organic Photonics + Electronics, 2016
We describe ongoing advances toward achieving all-organic optical sensors and a spectrometer on a chip. Two-dimensional combinatorial arrays of microcavity OLEDs (μcOLEDs) with systematically varying optical cavity lengths are fabricated on a single chip by changing the thickness of different organic and/or spacer layers sandwiched between two metal electrodes (one very thin) that form the cavity. The broad spectral range is achieved by utilizing materials that result in white OLEDs (WOLEDs) when fabricated on a standard ITO substrate. The tunable and narrower emissions from the μcOLEDs serve as excitation sources in luminescent sensors and in monitoring light absorption. For each wavelength, the light from the μcOLED is partially absorbed by a sample under study and the light emitted by an electronically excited sample, or the transmitted light is detected by a photodetector (PD). To obtain a compact monitor, an organic PD (OPD) or a perovskite-based PD is integrated with the μcOLED array. We show the potential of encompassing a broader wavelength range by using WOLED materials to fabricate the μcOLEDs. The utility of the all-organic analytical devices is demonstrated by monitoring oxygen, and bioanalytes based on oxygen detection, as well as the absorption spectra of dyes.
Joseph Shinar, Rajiv Kaudal, Eeshita Manna, Fadzai Fungura, and Ruth Shinar, "Advances in OLED/OPD-based sensors and spectrometer-on-a-chip
(Conference Presentation)," Proc. SPIE 9944, Organic Sensors and Bioelectronics IX, 99440F (Presented at SPIE Organic Photonics + Electronics: August 29, 2016; Published: 7 November 2016); https://doi.org/10.1117/12.2238656.5169177885001.
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