Print Email Facebook Twitter Monolithically Integrated Light Feedback Control Circuit for Blue/UV LED Smart Package Title Monolithically Integrated Light Feedback Control Circuit for Blue/UV LED Smart Package Author Koladouz Esfahani, Z. (TU Delft Electronic Components, Technology and Materials) Tohidian, M. (TU Delft Electronics) van Zeijl, H.W. (TU Delft Electronic Components, Technology and Materials) Kolahdouz, Mohammadreza (University of Tehran) Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials) Date 2017 Abstract Given the performance decay of high-power light-emitting diode (LED) chips over time and package condition changes, having a reliable output light for sensitive applications is a point of concern. In this study, a light feedback control circuit, including blue-selective photodiodes, for blue/ultraviolet (UV) LED, has been designed and implemented using a low-cost seven-mask BiCMOS process. The feedback circuit was monolithically integrated in a package with four high-power blue LED chips. For sensing the intensity of exact colored blue/UV light in the package, selective photodiodes at 480-nm wavelength were implemented. An opamp-based feedback circuit combined with a high-power transistor controls the output light based on real-time sensor data. The whole system is a low-cost integrated package that guarantees a stable and reliable output light under different working conditions. Output light can be also controlled linearly by a reference input voltage. Subject BiCMOS processBlue/ultraviolet (UV) light-emitting diode (LED)feedback controlhigh current CMOS transistorphotodetectorwafer level LED package. To reference this document use: http://resolver.tudelft.nl/uuid:37e8d1c2-8e24-4a2b-9b7f-d833f6679af5 DOI https://doi.org/10.1109/JPHOT.2017.2677580 ISSN 1943-0655 Source IEEE Photonics Journal, 9 (2) Part of collection Institutional Repository Document type journal article Rights © 2017 Z. Koladouz Esfahani, M. Tohidian, H.W. van Zeijl, Mohammadreza Kolahdouz, Kouchi Zhang Files PDF 07870601.pdf 1.32 MB Close viewer /islandora/object/uuid:37e8d1c2-8e24-4a2b-9b7f-d833f6679af5/datastream/OBJ/view