Abstract
Plasmonics enable significant improvements in the blue emission efficiencies of InGaN/GaN-based
semiconductors. However, it remains difficult to achieve high efficiency using plasmonics and other
methods in the green wavelength range of ~550 nm, which is the peak of human visual sensitivity.
Semiconductor LEDs suffer from a systematic drop in efficiency in the green/yellow region, known as
the “green gap,” and this gap must resolved. In this review, the author, who has been working on this issue
since the early 2000s, explains a new method using Ag nanoparticles and dielectric nanofilm structures
to solve this problem and obtains highly efficient green light emission.
