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Enhancing the brightness of Si nanocrystal light-emitting devices with electro-excited surface plasmons

机译：利用电激发表面等离子体激元提高Si纳米晶体发光器件的亮度

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摘要

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. Electroexcited 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.
机译：已显示在银纳米颗粒（Ag-NPs）中使用电激发表面等离激元（SP）可增强Si纳米晶体发光器件（Si-NC LED）的亮度。通过超声辐照和后退火处理，在Si-NC薄膜上制备Ag-NP。发现了在Ag-NP上的电激发SP，这是由于LED在电荷注入过程中对Ag-NP和前电极Al层的电子撞击而引起的。通过耦合到Si-NC的激子偶极矩的SP场，电激发的SP增强了Si-NC的电致发光或LED亮度。在200°C的退火温度下，Si-NC LED的亮度最大提高了5.2倍。可以检测到由电激发SP产生的残余远场辐射，这进一步支持了此类SP的存在。

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