title: Enhancing the brightness of Si nanocrystal light-emitting devices with electro-excited surface plasmons.
abstract: 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 °C. Remnant far-field radiations arising from electro-excited SPs are detected, which further supports the existence of such SPs.
authors.affiliation: Department of Optical Science and Engineering, and Shanghai Ultra-Precision Optical Manufacturing Engineering Center, Fudan University, Shanghai 200433, People's Republic of China. School of Information Engineering, Guizhou Min Zu University, Guiyang 550025, People's Republic of China.
authors.forename: Jia-Rong
authors.initials: JR
authors.lastname: Chen
authors.forename: Zhi-Quan
authors.initials: ZQ
authors.lastname: Zhou
authors.forename: Hong-Chen
authors.initials: HC
authors.lastname: Hao
authors.forename: Ming
authors.initials: M
authors.lastname: Lu