Tuning the Resonant Frequency of a Surface Plasmon by Double-Metallic Ag/Au Nanoparticles for High-Efficiency Green Light-Emitting Diodes
Currently, the internal quantum efficiency (IQE) of GaInN-based green light-emitting diodes (LEDs) is still low. To overcome this problem, surface plasmon (SP)-enhanced LEDs have been intensively studied for the last 15 years. For an SP effect in green LEDs, Au and Ag are typically employed as the p...
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| Format: | Article |
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MDPI AG
2019-01-01
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| Series: | Applied Sciences |
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| Online Access: | http://www.mdpi.com/2076-3417/9/2/305 |
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| author | Ryoya Mano Dong-Pyo Han Kengo Yamamoto Seiji Ishimoto Satoshi Kamiyama Tetsuya Takeuchi Motoaki Iwaya Isamu Akasaki |
| author_facet | Ryoya Mano Dong-Pyo Han Kengo Yamamoto Seiji Ishimoto Satoshi Kamiyama Tetsuya Takeuchi Motoaki Iwaya Isamu Akasaki |
| author_sort | Ryoya Mano |
| collection | DOAJ |
| description | Currently, the internal quantum efficiency (IQE) of GaInN-based green light-emitting diodes (LEDs) is still low. To overcome this problem, surface plasmon (SP)-enhanced LEDs have been intensively studied for the last 15 years. For an SP effect in green LEDs, Au and Ag are typically employed as the plasmonic materials. However, the resonance wavelength is determined by their material constants, which are theoretically fixed at ~537 nm for Au and ~437 nm for Ag. In this study, we aimed to tune the SP resonant wavelength using double-metallic nanoparticles (NPs) composed of Au and Ag to match the SP resonance wavelength to the LED emission wavelength to consequently improve the IQE of green LEDs. To form double-metallic NPs, Au/Ag multilayers were deposited on a GaN layer and then thermally annealed. We changed the thicknesses of the multilayers to control the Ag/Au ratio in the NPs. We show that the SP resonant wavelength could be tuned using our approach. We also demonstrate that the enhancement of the IQE in SP-enhanced LEDs was strongly dependent on the SP resonant wavelength. Finally, the highest IQE was achieved by matching the SP resonant wavelength to the LED emission wavelength. |
| first_indexed | 2024-12-12T02:54:17Z |
| format | Article |
| id | doaj.art-0fa2b5af2026465ca908ae571fa19c5b |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-12T02:54:17Z |
| publishDate | 2019-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-0fa2b5af2026465ca908ae571fa19c5b2022-12-22T00:40:49ZengMDPI AGApplied Sciences2076-34172019-01-019230510.3390/app9020305app9020305Tuning the Resonant Frequency of a Surface Plasmon by Double-Metallic Ag/Au Nanoparticles for High-Efficiency Green Light-Emitting DiodesRyoya Mano0Dong-Pyo Han1Kengo Yamamoto2Seiji Ishimoto3Satoshi Kamiyama4Tetsuya Takeuchi5Motoaki Iwaya6Isamu Akasaki7Faculty of Science and Technology, Meijo University, Nagoya 468-8502, JapanFaculty of Science and Technology, Meijo University, Nagoya 468-8502, JapanFaculty of Science and Technology, Meijo University, Nagoya 468-8502, JapanFaculty of Science and Technology, Meijo University, Nagoya 468-8502, JapanFaculty of Science and Technology, Meijo University, Nagoya 468-8502, JapanFaculty of Science and Technology, Meijo University, Nagoya 468-8502, JapanFaculty of Science and Technology, Meijo University, Nagoya 468-8502, JapanFaculty of Science and Technology, Meijo University, Nagoya 468-8502, JapanCurrently, the internal quantum efficiency (IQE) of GaInN-based green light-emitting diodes (LEDs) is still low. To overcome this problem, surface plasmon (SP)-enhanced LEDs have been intensively studied for the last 15 years. For an SP effect in green LEDs, Au and Ag are typically employed as the plasmonic materials. However, the resonance wavelength is determined by their material constants, which are theoretically fixed at ~537 nm for Au and ~437 nm for Ag. In this study, we aimed to tune the SP resonant wavelength using double-metallic nanoparticles (NPs) composed of Au and Ag to match the SP resonance wavelength to the LED emission wavelength to consequently improve the IQE of green LEDs. To form double-metallic NPs, Au/Ag multilayers were deposited on a GaN layer and then thermally annealed. We changed the thicknesses of the multilayers to control the Ag/Au ratio in the NPs. We show that the SP resonant wavelength could be tuned using our approach. We also demonstrate that the enhancement of the IQE in SP-enhanced LEDs was strongly dependent on the SP resonant wavelength. Finally, the highest IQE was achieved by matching the SP resonant wavelength to the LED emission wavelength.http://www.mdpi.com/2076-3417/9/2/305light-emitting diodesurface plasmonresonant frequencyinternal quantum efficiencynanoparticle |
| spellingShingle | Ryoya Mano Dong-Pyo Han Kengo Yamamoto Seiji Ishimoto Satoshi Kamiyama Tetsuya Takeuchi Motoaki Iwaya Isamu Akasaki Tuning the Resonant Frequency of a Surface Plasmon by Double-Metallic Ag/Au Nanoparticles for High-Efficiency Green Light-Emitting Diodes Applied Sciences light-emitting diode surface plasmon resonant frequency internal quantum efficiency nanoparticle |
| title | Tuning the Resonant Frequency of a Surface Plasmon by Double-Metallic Ag/Au Nanoparticles for High-Efficiency Green Light-Emitting Diodes |
| title_full | Tuning the Resonant Frequency of a Surface Plasmon by Double-Metallic Ag/Au Nanoparticles for High-Efficiency Green Light-Emitting Diodes |
| title_fullStr | Tuning the Resonant Frequency of a Surface Plasmon by Double-Metallic Ag/Au Nanoparticles for High-Efficiency Green Light-Emitting Diodes |
| title_full_unstemmed | Tuning the Resonant Frequency of a Surface Plasmon by Double-Metallic Ag/Au Nanoparticles for High-Efficiency Green Light-Emitting Diodes |
| title_short | Tuning the Resonant Frequency of a Surface Plasmon by Double-Metallic Ag/Au Nanoparticles for High-Efficiency Green Light-Emitting Diodes |
| title_sort | tuning the resonant frequency of a surface plasmon by double metallic ag au nanoparticles for high efficiency green light emitting diodes |
| topic | light-emitting diode surface plasmon resonant frequency internal quantum efficiency nanoparticle |
| url | http://www.mdpi.com/2076-3417/9/2/305 |
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