Output blue light evaluation for phosphor based smart white LED wafer level packages
Zahra Kolahdouz Esfahani (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Ali Rostamian (University of Tehran)
Mohammadreza Kolahdouz (University of Tehran)
Teng Ma
Henk van Zeijl (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Kouchi Zhang (TU Delft - Electrical Engineering, Mathematics and Computer Science)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
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.