期刊
NANOTECHNOLOGY
卷 25, 期 35, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/35/355203
关键词
surface plasmon; electro-excitation; Si nanocrystal LED; brightness
资金
- National Basic Research Program of China (973 Program) [2012CB934303]
- National Natural Science Foundation of China [61275178]
The use of electro-excited surface plasmons (SPs) in Ag nanoparticles (Ag-NPs) is shown to enhance the brightness of Si nanocrystal light-emitting devices (Si-NC LEDs). The Ag-NPs are prepared on the Si-NC thin film by ultrasonic irradiation and postannealing treatments. Electro-excited SPs on Ag-NPs are found, which are induced by electron impact on Ag-NPs and the front electrode Al layer during the charge injection process of LED. The electro-excited SPs enhance the electroluminescence of Si-NC, or LED brightness, via the SP field coupling to the exciton dipole moment of Si-NC. A maximal 5.2-fold brightness enhancement of Si-NC LED is achieved at the postannealing temperature of 200 degrees C. Remnant far-field radiations arising from electro-excited SPs are detected, which further supports the existence of such SPs.
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