关键词: 量子点, 可见光通信, 正交频分复用, 误码率, 白光LED 器件

Abstract: Focused on the lighting effect and lighting efficiency in current VLC ( Visible Light Communication) system，a VLC system with QDs-WLED ( Quantum Dots White LED) as light source is proposed，and a pair of portable VLC transmitter and receiver are designed and realized． The core-shell CdSe quantum dots with high stability and high quantum efficiency at 570 nm are synthesized by one-step synthesis method，and its QY ( Quantum Yield) can reach 81%． The quantum dots material，which replaces the traditional phosphor material，is mixed with epoxy resin and then apply to the blue LED ( Light Emiting Diode) chip to make white LED device． We test its emission spectrum，color coordinate map and lumen efficiency． The VLC structure and principle are described，the communication software and protocol are compiled，and both hardware and software are integrated． With the developed devices，the data transmission experiment is performed ． Experimental result show that the quantum dots white LED possess excellent lighting effects and energy-saving features，and also can achieve the function of data transmission．Under the optimum DC bias voltage of 2．70 V，the maximum communication distance of the system is about 1．3 m，the maximum bit rate is up to 267 kbit /s，and BEＲ( Bit Error Ｒatio) is less than 10 ^－3 ．

Key words: quantum dots, visible light communication( VLC) , optical orthogonal frequency division( OFDM) , bit error ratio ( BEＲ) , white LED devices