Top- and bottom-emission-enhanced electroluminescence of deep-UV light-emitting diodes induced by localised surface plasmons.
Top- and bottom-emission-enhanced electroluminescence of deep-UV light-emitting diodes induced by localised surface plasmons.
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局域表面等离子体引起的深紫外发光二极管的顶部和底部发射增强电致发光
DOI：
10.1038/srep04380
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发表时间：
2014-03-14
影响因子：
4.6
通讯作者：
Kang J
中科院分区：
文献类型：
--
作者：
Huang K;Gao N;Wang C;Chen X;Li J;Li S;Yang X;Kang J
我们报道了使用铝纳米颗粒来耦合局部表面等离子体增强的深紫外光发光二极管(深紫外光发光二极管)。采用斜角沉积法在深紫外光LED的顶面制备了多边形的Al纳米粒子。通过与Al纳米粒子中产生的LSP的耦合，可以有效地增强279 nm多量子阱发射的深紫外光LED的顶部和底部发射电致发光。主底发射波长比主顶发射波长长。这种波长的差异可以归因于衬底诱导的Fano共振效应。对于波长较短的共振模式，在几乎平行于器件表面的方向上，被引导回LED的辐射分数最大，并导致LED中的全反射和重新吸收。
We report localised-surface-plasmon (LSP) enhanced deep-ultraviolet light-emitting diodes (deep-UV LEDs) using Al nanoparticles for LSP coupling. Polygonal Al nanoparticles were fabricated on the top surfaces of the deep-UV LEDs using the oblique-angle deposition method. Both the top- and bottom-emission electroluminescence of deep-UV LEDs with 279 nm multiple-quantum-well emissions can be effectively enhanced by the coupling with the LSP generated in the Al nanoparticles. The primary bottom-emission wavelength is longer than the primary top-emission wavelength. This difference in wavelength can be attributed to the substrate-induced Fano resonance effect. For resonance modes with shorter wavelengths, the radiation fraction directed back into the LEDs is largest in the direction that is nearly parallel to the surface of the device and results in total reflection and re-absorption in the LEDs.
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