skip to main content

Title: Further reduction of efficiency droop effect by adding a lower-index dielectric interlayer in a surface plasmon coupled blue light-emitting diode with surface metal nanoparticles

Further reduction of the efficiency droop effect and further enhancements of internal quantum efficiency (IQE) and output intensity of a surface plasmon coupled, blue-emitting light-emitting diode (LED) by inserting a dielectric interlayer (DI) of a lower refractive index between p-GaN and surface Ag nanoparticles are demonstrated. The insertion of a DI leads to a blue shift of the localized surface plasmon (LSP) resonance spectrum and increases the LSP coupling strength at the quantum well emitting wavelength in the blue range. With SiO{sub 2} as the DI, a thinner DI leads to a stronger LSP coupling effect, when compared with the case of a thicker DI. By using GaZnO, which is a dielectric in the optical range and a good conductor under direct-current operation, as the DI, the LSP coupling results in the highest IQE, highest LED output intensity, and weakest droop effect.
Authors:
; ; ; ; ; ; ; ;  [1] ;  [2]
  1. Institute of Photonics and Optoelectronics, and Department of Electrical Engineering, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan (China)
  2. Department of Energy and Refrigerating Air-Conditioning Engineering, Tung Nan University, 152 Beishen Road, Section 3, New Taipei City, 22202 Taiwan (China)
Publication Date:
OSTI Identifier:
22310814
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; COUPLING; DIELECTRIC MATERIALS; DIRECT CURRENT; GALLIUM NITRIDES; GALLIUM OXIDES; LIGHT EMITTING DIODES; NANOPARTICLES; P-TYPE CONDUCTORS; QUANTUM EFFICIENCY; QUANTUM WELLS; REFRACTIVE INDEX; RESONANCE; SILICON OXIDES; SPECTRA; SURFACES; WAVELENGTHS; ZINC OXIDES