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

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

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&#x0...

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Bibliographic Details
Main Authors: Zahra Kolahdouz Esfahani, Massoud Tohidian, Henk van Zeijl, Mohammadreza Kolahdouz, Guoqi Zhang
Format: Article
Language:English
Published: IEEE 2017-01-01
Series:IEEE Photonics Journal
Subjects:
Blue/ultraviolet (UV) light-emitting diode (LED)
BiCMOS process
photodetector
high current CMOS transistor
feedback control
wafer level LED package.
Online Access:https://ieeexplore.ieee.org/document/7870601/
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Summary: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.
ISSN:1943-0655

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