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

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

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 max...

Is blue optical filter necessary in high speed phosphor-based white light LED visible light communications?

Optical blue filter is usually regarded as a critical optical component for high speed phosphor-based white light emitting diode (LED) visible-light-communication (VLC). However, the optical blue filter plays different roles in VLC when using modulations of on-off keying (OOK) or discrete multi-tone (DMT). We show that in the DMT VLC system, the blue optical filter may be unnecessary, and even ...

Phosphor-Based White Light Emitting Diode (LED) for Vertical Scanning Interferometry (VSI)

Real-time white-light phosphor-LED visible light communication (VLC) with compact size.

In this demonstration, we first demonstrate a real-time phosphor-LED visible light communication (VLC) system with 37 Mbit/s total throughput under a 1.5 m free space transmission length. The transmitter and receiver modules are compact size. Utilizing our proposed pre-equalization technology, the ~1 MHz bandwidth of phosphor LED could be extended to ~12 MHz without using blue filter. Thus, the...

ZigBee-based Smart Environment for LED Light Control

Lighting is one of the most efficient methods to conserve energy. The Philips Research reports that switching from traditional lamps (incandescent and fluorescent lamps) to solidstate lamps using LEDs (LED lamps) has an immediate impact on energy use, CO2 emissions and the environment and it also improves light quality [9]. Therefore, the Philips Research aggressively forecasts that the LED lam...