Investigation of Optical and Structural Stability of Localized Surface Plasmon Mediated Light‐Emitting Diodes by Ag and Ag/SiO2 Nanoparticles |
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| Authors: | Lee‐Woon Jang Dae‐Woo Jeon Myoung Kim Ju‐Won Jeon Alexander Y. Polyakov Jin‐Woo Ju Seung‐Jae Lee Jong‐Hyeob Baek Jin‐Kyu Yang In‐Hwan Lee |
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| Affiliation: | 1. School of Advanced Materials Engineering and Research Center of Advanced Materials Development and Semiconductor Physics Research Center, Chonbuk National University, Jeonju 561‐756, Korea;2. LED Device Team, Korea Photonics Technology Institute, Gwangju 500‐779, Korea;3. Department of Optical Engineering, Kongju National University, Kongju, Chungnam 314‐701, Korea |
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| Abstract: | Localized surface plasmon (LSP) effects due to Ag and Ag/SiO2 nanoparticles (NPs) deposited on GaN/InGaN multiquantum well (MQW) light‐emitting diode (LED) structures are studied. The colloidal NPs are synthesized by a sol‐gel method and drop‐cased on the LED structures. The surface density of NPs its controlled by the concentration of the NP solution. Theoretical modeling is performed for the emission spectrum and the electric field distribution of LSP resonance for Ag/SiO2 NPs. Enhanced photoluminescence (PL) efficiency is observed in the LED structures and the amount of PL enhancement increases with increasing the surface density of Ag and Ag/SiO2 NPs. These effects are attributed to resonance coupling between the MQW and LSP in the NPs. It is also shown that the PL enhancement attainable with Ag NPs and Ag/SiO2 NPs is comparable, but the latter displays a much higher stability with respect to long‐term storage and annealing due to a barrier for NP agglomeration, Ag oxidation, and impurity diffusion provided by the SiO2 shell. |
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| Keywords: | localized surface plasmons quantum efficiencies silver nanoparticles Ag/SiO2 nanoparticles light‐emitting diodes |
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