Utilizing CdSe/ZnS Core/Shell QDs to Improve the Modulation Bandwidth of WLED for Visible Light Communication

Visible light communication (VLC) is an advanced and high-efficiency wireless communication technology. As one of the most important light sources in VLC, conventional white LED based on Y(3)AI(5)O(12):Ce3+ (YAG:Ce) phosphor limits the system transmitting rate severely due to its narrow modulation bandwidth. Considering the short fluorescent lifetime of quantum dots (QDs), QD-LEDs with wide modulation bandwidth are designed here to improve the transmitting rate of VLC. CdSe/ZnS core/shell QDs and related luminescent microsphere (LMS) are implemented as light-conversion material for the QD-LEDs. Compared to conventional white LED, the proposed QD-LED reached maximum improvement on modulation bandwidth at 74.19%. Our findings will provide an effective solution of white LEDs for high speed VLC.