Figure 3.

Use of NPs to enhance the IQE of LEDs. (a) Two-dimensional ordered array of metal NPs placed in the vicinity of the QW active region of a LED. (b) Enhancement due to isolated Ag spheres on InGaN/GaN QW emitters with a separation of 10 nm as a function of the sphere radius a for different original radiative efficiencies. (c) Enhancement due to two-dimensional array of Ag spheres on InGaN/GaN QW emitters with a separation of 10 nm as a function of the sphere radius a for different original radiative efficiencies. Also shown is the optimized sphere spacing Ropt for ηrad = 0.001. Reproduced from [35]. Copyright American Institute of Physics, 2008.

Gu et al. Nanoscale Research Letters 2011 6:199   doi:10.1186/1556-276X-6-199
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