Monolithically Integrated Light Feedback Control Circuit for Blue/UV LED Smart Package

Koladouz Esfahani, Z.; Tohidian, M.; van Zeijl, H.W.; Kolahdouz, Mohammadreza; Zhang, Kouchi

doi:10.1109/JPHOT.2017.2677580

Monolithically Integrated Light Feedback Control Circuit for Blue/UV LED Smart Package

Journal article (2017)

Authors

Z. Koladouz Esfahani Electronic Components, Technology and Materials -

M. Tohidian Electronics -

H.W. van Zeijl Electronic Components, Technology and Materials -

Mohammadreza Kolahdouz University of Tehran

Kouchi Zhang Electronic Components, Technology and Materials -

Research Group

Electronic Components, Technology and Materials () (TU Delft)

DOI: https://doi.org/10.1109/JPHOT.2017.2677580

Feedback control Photodetector BiCMOS process Blue/ultraviolet (UV) light-emitting diode (LED) High current CMOS transistor Wafer level LED package.

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Published Date

2017

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

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.

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