Enhanced Luminescence of InGaN Quantum Well Structures with Localized Surface Plasmon by Using Sputter‐Fabricated Ag Nanoparticles in an Ionic Liquid

Abstract

Small, uniform Ag nanoparticles (NPs) in ionic liquids (ILs) are synthesized via simple sputtering route. The NPs embedded in polymer film are coated on top of InGaN/GaN active multiple quantum‐well light‐emitting structures and their optical characteristics are compared. The InGaN structures coated with Ag NPs show a significant increase in photoluminescence efficiency, mainly caused by localized surface plasmon (LSPs) coupling. Time‐resolved (TR) photoluminescence analysis demonstrates that the coupling efficiency is 47.2%. The increased luminescence is caused by good energy matching between the surface plasmon and the light emitter. The authors believe that present work takes a first step to utilize the advantages of metal NPs synthesized in ILs and has a great potential for use in various optoelectronic devices.

III‐Nitride Nanowires as Building Blocks for Advanced Light Emitting Diodes

“…Such PAIL nanoparticles show a much lower spread in characteristic diameter compared to sol–gel prepared Ag/SiO 2 nanoparticles which results in sharper LSP resonance (the shapes of the resonances are compared in Figure ). The characteristic dimensions of these PAIL nanoparticles can be made considerably lower than in sol–gel method because the IL ambience strongly handicaps agglomeration of nanoparticles . Thus, the variation of the resonant frequency for the given nanoparticles method can be achieved in a wider range.…”

“…The characteristic dimensions of these PAIL nanoparticles can be made considerably lower than in sol-gel method because the IL ambience strongly handicaps agglomeration of nanoparticles. [56,57] Thus, the variation of the resonant frequency for the given nanoparticles method can be achieved in a wider range. The enhancement of luminescent efficiency achieved for blue LED structures was comparable to that observed for optimized Ag/SiO 2 core/shell LSPs and the effect is as stable to temperature variations as in the case of Ag/SiO 2 .…”

“…This approach is described in ref. . Briefly, it consists in vacuum evaporation of desired metal and deposition of it into ionic liquids (IL) (see e.g., ref.…”

Enabling Localized Surface Plasmon Emission from InGaN/GaN Nano-LEDs Integrated with Ag/SiO2 Nanoparticles

“…For improving the light extraction efficiency of nanorod LEDs, the study of the localized surface plasmon (LSP) effect is a topic of interest among several methods, such as physical surface passivation, chemical treatment, and strain relaxation. − The LSP coupling effect is recognized as a simple and effective approach to increase light extraction from nanorod LEDs. Here, free-electron oscillations occurring at the surface of metal nanoparticles (NPs) are responsible for the improvement in the light output of LEDs. − It is well-documented that strong LSP coupling is exerted between the active multiple quantum well (MQW) of LEDs and metal NPs with close proximity once the emission wavelength of LEDs matches the LSP resonance of metal NPs. In addition, in comparison with standard planar InGaN/GaN MQW LED structures, nanorod LEDs can effectively promote strong energy coupling due to their larger surface area.…”