期刊
IEEE ELECTRON DEVICE LETTERS
卷 40, 期 2, 页码 267-270出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2018.2884934
关键词
Visible light communication; white light emitting diode; modulation bandwidth; quantum dots
资金
- National Basic Research and High Technology Program of China [2017YFB0403601, 2017YFB0403602]
- National Natural Science Foundation of China [11574306, 61774148]
- Major Science and Technology Project of Henan [161100210200]
High bandwidth GaN-based white light-emitting diode (LED) was fabricated using GHz bandwidth blue LED chip combined with CdSe/ZnS semiconductor quantum dots (QDs). The maximum optical power of the blue LED chip can reach 7.2 mW. By changing the optical power ratio of the LED chip to the white LED, we have investigated the modulation properties and established a frequency response function of QD-converted white LED. The behaviors of the measured and simulated bandwidths using the function are in good agreement with each other. After optimizing the optical power ratio and decreasing the chip carrier lifetime, the 637.6 MHz bandwidth of QD-converted white LED was achieved, which can support 675 Mb/s real-time non-return-to-zero on-off-keying signal at a low bit error rate of 4.35 x 10(-8) without optical filters. Our findings can help to design high bandwidth white LEDs for visible light communication applications in free space.
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