Enhanced external quantum efficiency in GaN-based vertical-type light-emitting diodes by localized surface plasmons
2016/3Yung-Chi Yao, Jung-Min Hwang, Zu-Po Yang, Jing-Yu Haung, Chia-Ching Lin, Wei-Chen Shen, Chun-Yang Chou, Mei-Tan Wang, Chun-Ying Huang, Ching-Yu Chen, Meng-Tsan Tsai, Tz-Neng Lin, Ji-Lin Shen, and Ya-Ju Lee
Abstract:
Enhancement of the external quantum efficiency of a GaN-based vertical-type light emitting diode
(VLED) through the coupling of localized surface plasmon (LSP) resonance with the wave-guided mode
light is studied. To achieve this experimentally, Ag nanoparticles (NPs), as the LSP resonant source,
are drop-casted on the most top layer of waveguide channel, which is composed of hydrothermally
synthesized ZnO nanorods capped on the top of GaN-based VLED. Enhanced light-output power and
external quantum efficiency are observed, and the amount of enhancement remains steady with
the increase of the injected currents. To understand the observations theoretically, the absorption
spectra and the electric field distributions of the VLED with and without Ag NPs decorated on ZnO NRs
are determined using the finite-difference time-domain (FDTD) method. The results prove that the
observation of enhancement of the external quantum efficiency can be attributed to the creation of an
extra escape channel for trapped light due to the coupling of the LSP with wave-guided mode light, by
which the energy of wave-guided mode light can be transferred to the efficient light scattering center of
the LSP.
(VLED) through the coupling of localized surface plasmon (LSP) resonance with the wave-guided mode
light is studied. To achieve this experimentally, Ag nanoparticles (NPs), as the LSP resonant source,
are drop-casted on the most top layer of waveguide channel, which is composed of hydrothermally
synthesized ZnO nanorods capped on the top of GaN-based VLED. Enhanced light-output power and
external quantum efficiency are observed, and the amount of enhancement remains steady with
the increase of the injected currents. To understand the observations theoretically, the absorption
spectra and the electric field distributions of the VLED with and without Ag NPs decorated on ZnO NRs
are determined using the finite-difference time-domain (FDTD) method. The results prove that the
observation of enhancement of the external quantum efficiency can be attributed to the creation of an
extra escape channel for trapped light due to the coupling of the LSP with wave-guided mode light, by
which the energy of wave-guided mode light can be transferred to the efficient light scattering center of
the LSP.
- Link:
- International Journals (國際期刊):
Yung-Chi Yao, Jung-Min Hwang, Zu-Po Yang, Jing-Yu Haung,
Chia-Ching Lin, Wei-Chen Shen, Chun-Yang Chou, Mei-Tan Wang, Chun-Ying Huang,
Ching-Yu Chen, Meng-Tsan Tsai, Tz-Neng Lin, Ji-Lin Shen, and Ya-Ju Lee, Enhanced external quantum efficiency in GaN-based vertical-type
light-emitting diodes by localized surface plasmons, Scientific Report, srep22659 (2016)
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