Output blue light evaluation for phosphor based smart white LED wafer level packages

Journal article (2016)

Authors

Z. Koladouz Esfahani Electronic Components, Technology and Materials - EEMCS
Ali Rostamian University of Tehran
Mohammadreza Kolahdouz University of Tehran
H.W. van Zeijl EKL Processing - EEMCS
Kouchi Zhang Electronic Components, Technology and Materials - EEMCS
Research Group
Electronic Components, Technology and Materials (EEMCS) (TU Delft)
Copyright: © 2016 Z. Koladouz Esfahani, Ali Rostamian, Mohammadreza Kolahdouz, Teng Ma, H.W. van Zeijl, Kouchi Zhang
DOI: https://doi.org/10.1364/OE.24.003216
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Published Date

2016

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

Abstract

This study presents a blue light detector for evaluating the output light of phosphor based white LED package. It is composed of a silicon stripe-shaped photodiode designed and implemented in a 2 μm BiCMOS process which can be used for wafer level integration of different passive and active devices all in just 5 lithography steps. The final device shows a high selectivity to blue light. The maximum responsivity at 480nm is matched with the target blue LED illumination. The designed structure have better responsivity compared to simple photodiode structure due to reducing the effect of dead layer formation close to the surface because of implantation. It has also a two-fold increase in the responsivity and quantum efficiency compared to previously similar published sensors.

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