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Oh JK, Um DY, Chandran B, Kim SU, Lee CR, Ra YH. Low-Leakage Current Core-Shell AlGaN Nanorod LED Device Operating in the Ultraviolet-B Band. ACS Appl Mater Interfaces 2024; 16:9020-9029. [PMID: 38324755 DOI: 10.1021/acsami.3c17356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Despite the considerable potential of AlGaN-based ultraviolet-B light-emitting diodes (UV-B LEDs) in various applications such as phototherapy, UV curing, plant growth, and analytical technology, their development is still ongoing due to low luminescence efficiency. In this study, we introduced a novel epitaxial growth mechanism to effectively control the height and thickness of AlGaN multiple wells (MWs) on AlGaN nanorod structures using horizontal reactor-based metal-organic chemical vapor deposition (MOCVD). By adjusting the H2 carrier gas flow rate, we could control the growth boundary layer's thickness, successfully separating the AlGaN well and p-AlGaN layer from the substrate. Cathodoluminescence (CL) measurements confirmed the stability of the core-shell AlGaN quantum wells as a highly stable nonpolarized structure, with the wavelength peak remaining almost unchanged under various injection currents. Furthermore, transmission electron microscopy (TEM) provided clear evidence of differentiation, highlighting the distinct formation of the 275 nm AlGaN core and the 295 nm AlGaN shell structure. The developed AlGaN MW structure, characterized by these rectification features, not only demonstrated a significantly improved electroluminescence (EL) peak intensity but also exhibited a much lower leakage current compared to the conventional core-shell AlGaN structure. The newly proposed growth mechanism and advanced nonpolarized core-shell AlGaN structure are expected to serve as excellent alternatives for substantially enhancing the efficiency of the next generation of high-efficiency UV LEDs.
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Affiliation(s)
- Jeong-Kyun Oh
- Division of Advanced Materials Engineering, Engineering College, Research Center for Advanced Materials Development (RCAMD), Jeonbuk National University (JBNU), Jeonju 54896, Republic of Korea
| | - Dae-Young Um
- Division of Advanced Materials Engineering, Engineering College, Research Center for Advanced Materials Development (RCAMD), Jeonbuk National University (JBNU), Jeonju 54896, Republic of Korea
| | - Bagavath Chandran
- Division of Advanced Materials Engineering, Engineering College, Research Center for Advanced Materials Development (RCAMD), Jeonbuk National University (JBNU), Jeonju 54896, Republic of Korea
| | - Sung-Un Kim
- Division of Advanced Materials Engineering, Engineering College, Research Center for Advanced Materials Development (RCAMD), Jeonbuk National University (JBNU), Jeonju 54896, Republic of Korea
| | - Cheul-Ro Lee
- Division of Advanced Materials Engineering, Engineering College, Research Center for Advanced Materials Development (RCAMD), Jeonbuk National University (JBNU), Jeonju 54896, Republic of Korea
| | - Yong-Ho Ra
- Division of Advanced Materials Engineering, Engineering College, Research Center for Advanced Materials Development (RCAMD), Jeonbuk National University (JBNU), Jeonju 54896, Republic of Korea
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Zhang B, Zhai W, Wang J. Self-Powered Wavelength-Dependent Dual-Polarity Response Photodetector Based on CdS@PEDOT:PSS@Au Sandwich-Structured Core-Shell Nanorod Arrays. ACS Appl Mater Interfaces 2023; 15:45970-45980. [PMID: 37733606 DOI: 10.1021/acsami.3c07869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
Self-powered operation and multifunctionality have significantly oriented the development of photodetectors (PDs), which could be realized through nanoarchitecture construction and energy band structure design. Herein, a self-powered wavelength-dependent dual-polarity response PD based on (CdS@PEDOT:PSS@Au) sandwich-structured core-shell nanorod arrays (NRAs) is proposed. The synthesis approach of this three-layer heterostructure consists of a hydrothermal reaction, spin coating, and thermal evaporation. The n-CdS/p-PEDOT:PSS junction and the PEDOT:PSS/Au Schottky junction at the interfaces provide two photocurrent driving forces in opposite directions, and their contribution to the net photocurrent is controlled by the incident light wavelength due to the different light absorption ranges of the CdS core and the PEDOT:PSS shell. As a result, the polarity of the photocurrent switches from negative to positive as the wavelength increases. In addition, the response speed of negative photocurrents (∼10 ms) is faster than that of positive photocurrents (∼100 ms), which is consistent with the underlying mechanism of the dual-polarity response. Furthermore, color discrimination and imaging capabilities are demonstrated by deploying the PDs as sensing pixels and recognizing green and red patterns. The sandwich-structured core-shell NRA heterojunction system introduces a novel idea for dual-polarity response PDs.
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Affiliation(s)
- Boyong Zhang
- MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi'an710072, China
| | - Wei Zhai
- MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi'an710072, China
| | - Jianyuan Wang
- MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, Northwestern Polytechnical University, Xi'an710072, China
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Chu A, He H, Yin Z, Peng R, Yang H, Gao X, Luo D, Chen R, Xing G, Liu YJ. Plasmonically Enhanced Upconversion Luminescence via Holographically Formed Silver Nanogratings. ACS Appl Mater Interfaces 2020; 12:1292-1298. [PMID: 31820628 DOI: 10.1021/acsami.9b16461] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Greatly enhanced upconversion luminescence was demonstrated by integrating the core-shell upconversion nanorods with the Ag nanogratings. Both the Ag nanogratings and upconversion nanorods were fabricated/synthesized in a facile, cost-effective, high-throughput way. Experimental results showed that the upconversion luminescence intensity of Er3+ in the core-shell upconversion nanorods can be well tuned and enhanced by changing the shell thickness and the period of the Ag nanograting. The underlying physical mechanism for the upconversion luminescence enhancement was attributed to the plasmonically enhanced near infrared broadband absorption of the periodic Ag nanograting and the localized surface plasmon resonance of Ag nanocrystals. The maximum enhanced factors of 523 nm, 544 nm (green emission), and 658 nm (red emission) of Er3+ ions excited at 980 nm are 3.8-, 5.5-, and 4.6-folds, respectively. Our fabrication approach and results suggest that such a simple integration is potentially useful for biosensing/imaging and anti-counterfeiting applications.
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Affiliation(s)
- Anshi Chu
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , Nanjing 211816 , China
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Huilin He
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
- Harbin Institute of Technology , Harbin 150001 , China
| | - Zhen Yin
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Ruiheng Peng
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Hongcheng Yang
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Xian Gao
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Dan Luo
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Rui Chen
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Guichuan Xing
- Institute of Applied Physics and Materials Engineering , University of Macau , Macau SAR 999078 , China
| | - Yan Jun Liu
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
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Schrittwieser S, Pelaz B, Parak WJ, Lentijo-Mozo S, Soulantica K, Dieckhoff J, Ludwig F, Altantzis T, Bals S, Schotter J. Homogeneous Protein Analysis by Magnetic Core-Shell Nanorod Probes. ACS Appl Mater Interfaces 2016; 8:8893-8899. [PMID: 27023370 DOI: 10.1021/acsami.5b11925] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Studying protein interactions is of vital importance both to fundamental biology research and to medical applications. Here, we report on the experimental proof of a universally applicable label-free homogeneous platform for rapid protein analysis. It is based on optically detecting changes in the rotational dynamics of magnetically agitated core-shell nanorods upon their specific interaction with proteins. By adjusting the excitation frequency, we are able to optimize the measurement signal for each analyte protein size. In addition, due to the locking of the optical signal to the magnetic excitation frequency, background signals are suppressed, thus allowing exclusive studies of processes at the nanoprobe surface only. We study target proteins (soluble domain of the human epidermal growth factor receptor 2 - sHER2) specifically binding to antibodies (trastuzumab) immobilized on the surface of our nanoprobes and demonstrate direct deduction of their respective sizes. Additionally, we examine the dependence of our measurement signal on the concentration of the analyte protein, and deduce a minimally detectable sHER2 concentration of 440 pM. For our homogeneous measurement platform, good dispersion stability of the applied nanoprobes under physiological conditions is of vital importance. To that end, we support our measurement data by theoretical modeling of the total particle-particle interaction energies. The successful implementation of our platform offers scope for applications in biomarker-based diagnostics as well as for answering basic biology questions.
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Affiliation(s)
| | - Beatriz Pelaz
- Fachbereich Physik, Philipps-Universität Marburg , Marburg, Germany
| | - Wolfgang J Parak
- Fachbereich Physik, Philipps-Universität Marburg , Marburg, Germany
- CIC Biomagune , San Sebastian, Spain
| | - Sergio Lentijo-Mozo
- Laboratoire de Physique et Chimie des Nano-objets (LPCNO), Université de Toulouse; INSA, UPS, CNRS , Toulouse, France
| | - Katerina Soulantica
- Laboratoire de Physique et Chimie des Nano-objets (LPCNO), Université de Toulouse; INSA, UPS, CNRS , Toulouse, France
| | - Jan Dieckhoff
- Institute of Electrical Measurement and Fundamental Electrical Engineering, TU Braunschweig , Braunschweig, Germany
| | - Frank Ludwig
- Institute of Electrical Measurement and Fundamental Electrical Engineering, TU Braunschweig , Braunschweig, Germany
| | - Thomas Altantzis
- Electron Microscopy for Materials Research (EMAT), University of Antwerp , Antwerp, Belgium
| | - Sara Bals
- Electron Microscopy for Materials Research (EMAT), University of Antwerp , Antwerp, Belgium
| | - Joerg Schotter
- Molecular Diagnostics, AIT Austrian Institute of Technology , Vienna, Austria
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