Yang Kuo

National Taiwan University

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C. C. Yang

University of Science and Technology of China

Yean‐Woei Kiang

National Taiwan University

Wen-Yen Chang

National Taiwan University

Chieh Hsieh

National Taiwan University

Chun-Han Lin

National Taiwan Ocean University

Shaobo Yang

National Taiwan University

Horng-Shyang Chen

National Taiwan University

Yufeng Yao

University of the West of England

Chia-Ying Su

National Taiwan University

Pei-Ying Shih

National Taiwan University

Cooperative Institutions

National Taiwan University

National Yang Ming Chiao Tung University

National Cheng Kung University

National Tsing Hua University

Epistar (Taiwan)

National Chung Cheng University

National Central University

University of Electronic Science and Technology of China

National Taipei University

National Chung Hsing University

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Behaviors of Surface Plasmon Coupled Light-Emitting Diodes Induced by Surface Ag Nanoparticles on Dielectric Interlayers

Plasmonics (2015)

Chun-Han Lin Chung-Hui Chen Yufeng Yao Chia-Ying Su Pei-Ying Shih

Localized surface plasmon

10.1007/s11468-015-9902-9

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Citations (11)

Surface plasmon coupling in a deep-UV light-emitting diode with an embedded Al nanoparticle

2022 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) (2015)

Yang Kuo C. C. Yang Yean‐Woei Kiang

The radiated power enhancement (suppression) of a c-plane (c-axis) oriented radiating dipole at a given emission wavelength in the quantum well of a c-plane, deep-UV light-emitting diode (LED) when it is coupled with a surface plasmon (SP) resonance mode induced on a nearby Al nanoparticle (NP) is demonstrated. Also, the enhanced radiated power mainly propagates in the direction from the Al NP toward the dipole. Such SP coupling behaviors can be used for suppressing the TM-polarized emission, enhancing the TE-polarized emission, and reducing the UV absorption of the p-GaN layer in such a deep-UV LED.

Localized surface plasmon

10.1109/nusod.2015.7292816

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Theoretical/Numerical Studies of the Nanoscale-cavity Effects on Dipole Emission, Förster Resonance Energy Transfer and Surface Plasmon Coupling

Research Square (Research Square) (2023)

Yang Kuo C. C. Yang

Abstract The electric field and radiated power of a radiating dipole located inside a spherical nano-cavity are formulated to show that the nano-cavity structure or nanoscale-cavity effect can enhance the near-field intensity inside the cavity and the far-field radiated power of the dipole. Such enhancements are caused by two contributing factors, including the classical electromagnetic scattering as formulated and the Purcell effect, which is implemented through a numerical feedback process by assuming a two-level system for the radiating dipole. The enhancement of near-field intensity results in the efficiency increase of Förster resonance energy transfer when both energy donor and acceptor are located inside the nano-cavity. By combining the enhancements of the field intensity of the donor and the radiated power of the acceptor, the color conversion efficiency can be increased through the nanoscale-cavity effect. We also numerically demonstrate that the nanoscale-cavity effect can enhance surface plasmon coupling for increasing the radiated power of a dipole located nearby an Ag nanoparticle inside a nano-cavity.

Localized surface plasmon

10.21203/rs.3.rs-3144087/v1

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Surface Plasmon Resonance-Induced Diffusion-Limited Aggregation in the Formation of Ag/AgO_x Nanonetworks as Broad-Spectrum Transparent Conductors

ACS Applied Nano Materials (2020)

Yi-Chiao Hsu Chia-Chun Ni Yu-Cheng Su Ping-Hsiu Wu Jiawei Chen

Based on the generation and transportation of hot electrons and the diffusion-limited aggregation of Ag+ ions induced by the surface plasmon resonance of surface Ag nanoparticles (NPs) with ambient moisture, we develop a new mechanism for fabricating a surface Ag nanonetwork (NNW) structure on a slightly conductive template through Ag NP reorganization and AgOx formation. Such an extended NNW structure consists of distributed Ag NPs covered and connected by AgOx to form a highly transparent conductive network. Its sheet resistance is as low as ∼140 Ω/square while its transmittance lies between 80 and 90%. The process of diffusion-limited aggregation is regulated by electrostatic induction between diffuse Ag+ ions in a thin surface water layer condensed from moisture and the sharp tips of an NNW structure during its formation. Oxygen atoms can be dissociated from AgOx when a post-thermal treatment at a temperature higher than 412 °C is applied, leaving behind an Ag thin layer, which still connects the remaining Ag NPs to form a different conductive network of ∼240 Ω/square in sheet resistance. Such an NNW structure can stand an elevated temperature up to ∼400 °C and is thermally stable. It can extend the transparent spectrum into ultraviolet and near-infrared ranges and can be applied to touch-panel displays, ultraviolet light-emitting diodes, and flexible optoelectronics devices.

Ultraviolet

10.1021/acsanm.0c02480

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ChemInform Abstract: Diversifolol (I), a Novel Rearranged Eudesmane Sesquiterpene from the Leaves of Tithonia diversifolia

ChemInform (1997)

Yang Kuo Chien‐Hsu Chen

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Tithonia

10.1002/chin.199751197

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Citations (15)

Photon color conversion enhancement of colloidal quantum dots inserted into a subsurface laterally-extended GaN nano-porous structure in an InGaN/GaN quantum-well template

Optics Express (2023)

Chen-Hua Chen Sheng-Yang Kuo His-Yu Feng Zong-Han Li Shaobo Yang

To improve the color conversion performance, we study the nanoscale-cavity effects on the emission efficiency of a colloidal quantum dot (QD) and the Förster resonance energy transfer (FRET) from quantum well (QW) into QD in a GaN porous structure (PS). For this study, we insert green-emitting QD (GQD) and red-emitting QD (RQD) into the fabricated PSs in a GaN template and a blue-emitting QW template, and investigate the behaviors of the photoluminescence (PL) decay times and the intensity ratios of blue, green, and red lights. In the PS samples fabricated on the GaN template, we observe the efficiency enhancements of QD emission and the FRET from GQD into RQD, when compared with the samples of surface QDs, which is attributed to the nanoscale-cavity effect. In the PS samples fabricated on the QW template, the FRET from QW into QD is also enhanced. The enhanced FRET and QD emission efficiencies in a PS result in an improved color conversion performance. Because of the anisotropic PS in the sample surface plane, the polarization dependencies of QD emission and FRET are observed.

Indium gallium nitride

Quantum Efficiency

10.1364/oe.478250

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Efficiency enhancement of light color conversion through surface plasmon coupling

Optics Express (2018)

Chun-Han Lin Hsin-Chun Chiang Yao-Tseng Wang Yu‐Feng Yao Chi‐Chung Chen

The efficiency enhancement of light color conversion from blue quantum well (QW) emission into red quantum dot (QD) emission through surface plasmon (SP) coupling by coating CdSe/ZnS QDs on the top of an InGaN/GaN QW light-emitting diode (LED) is demonstrated. Ag nanoparticles (NPs) are fabricated within a transparent conductive Ga-doped ZnO interlayer to induce localized surface plasmon (LSP) resonance for simultaneously coupling with the QWs and QDs. Such a coupling process generates three enhancement effects, including QW emission, QD absorption at the QW emission wavelength, and QD emission, leading to an overall enhancement effect of QD emission intensity. An Ag NP geometry for inducing an LSP resonance peak around the middle between the QW and QD emission wavelengths results in the optimized condition for maximizing QD emission enhancement. Internal quantum efficiency and photoluminescence (PL) decay time measurements are performed to show consistent results with LED performance characterizations, even though the QD absorption of PL excitation laser may mix with the SP-induced QD absorption enhancement effect in PL measurement.

Localized surface plasmon

Purcell effect

Quantum Efficiency

Emission intensity

10.1364/oe.26.023629

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Citations (24)

Evaluating the blue-shift behaviors of the surface plasmon coupling of an embedded light emitter with a surface Ag nanoparticle by adding a dielectric interlayer or coating

Optics Express (2015)

Yang Kuo Wen-Yen Chang Chun-Han Lin C. C. Yang Yean‐Woei Kiang

The surface plasmon (SP) coupling behaviors of an embedded light emitter or radiating dipole in GaN with a surface Ag nanoparticle (NP) in four structures of different added dielectric geometries, including an extended dielectric interlayer (DI) and a DI of a finite width between the Ag NP and GaN, a dielectric coating on the Ag NP, and no dielectric addition, are numerically compared. Either an added DI or dielectric coating can lead to the blue shift of localized surface plasmon (LSP) dipole resonance peak or the spectral peak of radiated power enhancement ratio with respect to that of the structure without dielectric addition. A smaller dielectric refractive-index or a larger dielectric thickness results in a larger blue-shift range. Under the condition of the same dielectric refractive-index and thickness, the structure of a DI with a finite width leads to the largest blue-shift range, followed by the structure of an extended DI and then the structure of a dielectric coating. In a practical application, for a given emission wavelength of a blue-emitting quantum well, the emission enhancement effect through SP coupling depends on the LSP resonance strength at this wavelength. Our study also shows that although the LSP resonance peak can be blue-shifted by reducing the size of a surface Ag NP, its SP coupling strength is dramatically reduced. Adding a DI or dielectric coating is a more practical approach for shifting the major LSP resonance mode of a surface Ag NP from the green into blue range.

Blueshift

Localized surface plasmon

10.1364/oe.23.030709

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Citations (20)

Surface plasmon effects in the absorption enhancements of amorphous silicon solar cells with periodical metal nanowall and nanopillar structures

Optics Express (2011)

Hung-Yu Lin Yang Kuo Cheng-Yuan Liao C. C. Yang Yean‐Woei Kiang

The authors numerically investigate the absorption enhancement of an amorphous Si solar cell, in which a periodical one-dimensional nanowall or two-dimensional nanopillar structure of the Ag back-reflector is fabricated such that a dome-shaped grating geometry is formed after Si deposition and indium-tin-oxide coating. In this investigation, the effects of surface plasmon (SP) interaction in such a metal nanostructure are of major concern. Absorption enhancement in most of the solar spectral range of significant amorphous Si absorption (320-800 nm) is observed in a grating solar cell. In the short-wavelength range of high amorphous Si absorption, the weakly wavelength-dependent absorption enhancement is mainly caused by the broadband anti-reflection effect, which is produced through the surface nano-grating structures. In the long-wavelength range of diminishing amorphous Si absorption, the highly wavelength-sensitive absorption enhancement is mainly caused by Fabry-Perot resonance and SP interaction. The SP interaction includes the contributions of surface plasmon polariton and localized surface plasmon.

Nanopillar

Localized surface plasmon

Indium tin oxide

Plasmonic solar cell

10.1364/oe.20.00a104

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Citations (33)

Resonance Behaviors of Localized Surface Plasmon on an Ag/GaN Nano-Grating Interface for Light-Emitting Diode Application

Plasmonics (2018)

Wen-Yen Chang Yang Kuo Yu‐Feng Yao Yean‐Woei Kiang C. C. Yang

Interface (matter)

Localized surface plasmon

10.1007/s11468-018-0752-0

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Citations (3)