Sheng-Yang Kuo

National Taiwan University

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C. C. Yang

University of Science and Technology of China

Ruei-Nan Wu

National Taiwan University

Chia-Chun Ni

National Taiwan University

Yu-Cheng Su

Beijing Institute of Technology

Yang Kuo

National Taiwan University

Ping-Hsiu Wu

National Taiwan University

Yean‐Woei Kiang

National Taiwan University

Shung-Hsiang Wu

National Taiwan University

Chien‐Yu Chen

Taipei Medical University

Yi-Chiao Hsu

National Taiwan University

Cooperative Institutions

National Taiwan University

National Yang Ming Chiao Tung University

National Chung Hsing University

ITRI International

Industrial Technology Research Institute

National Chi Nan University

Chung Yuan Christian University

National Dong Hwa University

Institute of Biological Chemistry, Academia Sinica

Fudan University

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Förster resonance energy transfer in surface plasmon coupled color conversion processes of colloidal quantum dots

Optics Express (2021)

Chia-Chun Ni Sheng-Yang Kuo Zong-Han Li Shung-Hsiang Wu Ruei-Nan Wu

Förster resonance energy transfer (FRET) from a green-emitting quantum dot (GQD) into a red-emitting quantum dot (RQD) is an important mechanism in a multiple-color conversion process, particularly under the surface plasmon (SP) coupling condition for enhancing color conversion efficiency. Here, the dependencies of FRET efficiency on the relative concentrations of GQD and RQD in their mixtures and their surface molecule coatings for controlling surface charges are studied. Also, the SP coupling effects induced by two kinds of Ag nanoparticles on the emission behaviors of GQD and RQD are demonstrated, particularly when FRET is involved in the coupling process. FRET efficiency is reduced under the SP coupling condition. SP coupling can enhance the color conversion efficiency of either GQD or RQD. The combination of SP coupling and FRET can be used for controlling the relative converted light intensities in a multiple-color conversion process.

Resonant inductive coupling

Quantum Efficiency

Energy transformation

10.1364/oe.415679

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Citations (17)

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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Combined effects of surface plasmon coupling and Förster resonance energy transfer on the light color conversion behaviors of colloidal quantum dots on an InGaN/GaN quantum-well nanodisk structure

Nanotechnology (2020)

Yen‐Po Chen Chia-Chun Ni Ruei-Nan Wu Sheng-Yang Kuo Yu-Cheng Su

By forming nanodisk (ND) structures on a blue-emitting InGaN/GaN quantum-well (QW) template, the QWs become close to the red-emitting quantum dots (QDs) and Ag nanoparticles (NPs) attached onto the sidewalls of the NDs such that Förster resonance energy transfer (FRET) and surface plasmon (SP) coupling can occur to enhance the efficiency of blue-to-red color conversion. With a larger ND height, more QWs are exposed to open air on the sidewall for more QD/Ag NP attachment through QD self-assembly and Ag NP drop casting such that the FRET and SP coupling effects, and hence the color conversion efficiency can be enhanced. A stronger FRET process leads to a longer QD photoluminescence (PL) decay time and a shorter QW PL decay time. It is shown that SP coupling can enhance the FRET efficiency.

Quantum Efficiency

Resonant inductive coupling

10.1088/1361-6528/abd05e

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Surface plasmon coupling effects on the förster resonance energy transfer from quantum dot into rhodamine 6G

Nanotechnology (2021)

Chien‐Yu Chen Chia-Chun Ni Ruei-Nan Wu Sheng-Yang Kuo Chia‐Hao Li

Abstract Rhodamine 6G (R6G) molecules linked CdZnSeS/ZnS green-emitting quantum dots (QDs) are self-assembled onto Ag nanoparticles (NPs) for studying the surface plasmon (SP) coupling effect on the Förster resonance energy transfer (FRET) process from QD into R6G. SP coupling can enhance the emission efficiency of QD such that FRET has to compete with QD emission for transferring energy into R6G. It is found that FRET efficiency is reduced under the SP coupling condition. Although R6G emission efficiency can also be enhanced through SP coupling when it is directly linked onto Ag NP, the enhancement decreases when R6G is linked onto QD and then the QD-R6G complex is self-assembled onto Ag NP. In particular, R6G emission efficiency can be reduced through SP coupling when the number of R6G molecules linked onto a QD is high. A rate-equation model is built for resembling the measured photoluminescence decay profiles and providing us with more detailed explanations for the observed FRET and SP coupling behaviors.

Rhodamine 6G

Resonant inductive coupling

Rhodamine

10.1088/1361-6528/abf775

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Spatial range of the plasmonic Dicke effect in an InGaN/GaN multiple quantum well structure

Nanotechnology (2020)

Wai Fong Tse Ruei-Nan Wu Cai-Chen Lu Yi-Chiao Hsu Yen‐Po Chen

The plasmonic Dicke effect means a cooperative emission mechanism of multiple light emitters when they are simultaneously coupled with the same surface plasmon (SP) mode of a metal nanostructure to achieve a higher collective emission efficiency. Here, we compare the enhancements of emission efficiency among a series of SP-coupled InGaN/GaN quantum-well (QW) structures of different QW period numbers to show an emission behavior consistent with the plasmonic Dicke effect. The relative enhancement of overall emission efficiency increases with QW period number until it reaches a critical value, beyond which the enhancement starts to decrease. This critical QW period number corresponds to the effective depth range of the plasmonic Dicke effect in a multiple-QW system. It also represents an optimized QW structure for maximizing the SP coupling effect. Internal quantum efficiency and time-resolved photoluminescence are measured for comparing the enhanced emission efficiencies of blue and green QW structures with different QW period numbers through SP coupling induced by surface Ag nanoparticles.

Quantum Efficiency

10.1088/1361-6528/ab87cc

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Surface Plasmon Coupling of Ag Nanoparticles with InGaN/GaN Quantum Wells for Enhancing the Emission Efficiency of Light-Emitting Devices

ACS Applied Nano Materials (2022)

Ruei-Nan Wu Chia-Chun Ni Shaobo Yang Yang Kuo Wen-Yen Chang

The application of surface metal nanoparticles (NPs) to a light-emitting diode for producing surface plasmon (SP) coupling with its quantum wells (QWs) is a simple and effective technique to increase its emission efficiency. However, the control of the hot spot geometry in the SP coupling process for maximizing its effect is not well understood yet. In this study, InGaN/GaN QW templates are overlaid with chemically synthesized Ag NPs, which are bonded onto GaN through an electrostatic force, for studying the SP coupling effects under different conditions of in situ Ag NP deformation. Through the Ag NP deformation, the geometry of the contact interface between a Ag NP and the QW template can be controlled, leading to different SP coupling behaviors. The results of a simulation study indicate that the substrate mode behavior of the localized SP resonance on a surface Ag NP, which is strongly related to the contact-interface geometry, plays a key role in controlling the SP coupling spectrum and strength.

Template

Localized surface plasmon

10.1021/acsanm.2c01375

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Citations (8)