Article
Physics, Applied
Simran Arora, Subhabrata Dhar
Summary: The electroluminescence properties of n(+)-ZnO/p-GaN pn(+)-heterojunctions grown epitaxially have been investigated as a function of applied bias and temperature. The study reveals the presence of indirect interfacial excitons at lower temperatures. The electroluminescence feature associated with these excitons is redshifted with increasing forward bias. The formation of these excitons becomes unsustainable when the applied bias or temperature exceeds a threshold due to leakage and thermal escape of charges.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Do-Yeong Shin, Taehwan Kim, Ozgun Akyuz, Hilmi Volkan Demir, In-Hwan Lee
Summary: This study presents an improved efficiency design for white LEDs by integrating blue nanorod LEDs with green and red-emitting perovskite nanocrystal films. The design utilizes the localized surface plasmon effect of Ag@SiO2 nanoparticles to enhance the photoluminescence intensity of blue LEDs, while the high-power blue LED backlight improves the perovskite photoluminescence intensity. The resulting white LED with Ag@SiO2 nanoparticle-embedded nanorods demonstrates a 62% increase in photoluminescence intensity compared to planar white LEDs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Optics
Shaobing Wu, Xi Cheng, Ximing Rong, Shun Han, Peijiang Cao, Yuxiang Zeng, Wangying Xu, Ming Fang, Wenjun Liu, Deliang Zhu, Youming Lu
Summary: By introducing Ag nanoparticles onto the n-ZnCdO/MgO dual-layer structure, the electroluminescence of p-GaN and n-ZnCdO can be significantly enhanced. The enhancement is mainly due to the resonant coupling between electron-hole pairs in the emission layers and surface plasmon of Ag nanoparticles. The dual-mode emission can be achieved by adjusting the thickness of the Ag film when there is a MgO blocking layer between n-ZnCdO and p-GaN.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Multidisciplinary
Islam Mohammad Shafiqul, Raj Deep, Jie Lin, Toshiyuki Yoshida, Yasuhisa Fujita
Summary: In this study, nitrogen-doped zinc oxide nanoparticles were successfully synthesized using the gas evaporation method with DC arc plasma. The nitrogen concentration was found to have an impact on the Raman spectra and photoluminescence spectra of the nanoparticles.
Article
Physics, Condensed Matter
Muhammad Usman, Sibghatullah Khan, Sana Saeed, Shazma Ali
Summary: Efficient yellow InGaN light-emitting diodes (LEDs) have been achieved by using quaternary (AlInGaN) and ternary (AlGaN) quantum barriers, resulting in a 47% increase in radiative recombination rate compared to conventional yellow LEDs. Moreover, the proposed LEDs also exhibit significantly reduced efficiency droop.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Multidisciplinary
Yulan Xie, Peng Wan, Mingming Jiang, Yang Liu, Daning Shi, Caixia Kan
Summary: This study presents a high-performance self-powered ultraviolet photodetector based on a single Ga-doped ZnO microwire covered by Ag nanowires and a p-type GaN wafer. The photodetector exhibits ultrafast response and high photosensitivity, with significantly improved responsivity and detectivity compared to a conventional ITO electrode. The enhanced performance is attributed to the higher optical transparency and better electrical properties of the Ag nanowires, as well as the plasmonic effect on ZnO:Ga, which enhances light absorption and photocurrent.
Article
Chemistry, Multidisciplinary
Yunping Zhao, Yixiao Niu, Wei Shi, Zhen Zhang, Xuyong Yang, Bin Wei, Yudong Pang, Wai-Yeung Wong
Summary: In this study, a light out-coupling layer composed of Ag nanoparticles and MoOx was introduced on top of the inverted top-emitting OLED. The LOCL significantly improved the light output-coupling of the OLED and protected the sensitive electron injection material, resulting in enhanced device performance. The current efficiency and external quantum efficiency of the OLED were increased by 53% and 30%, respectively.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Yuwei Liu, Liya Zeng, Danni Wu, Xiaogang Xue, Ping Cai, Xiaowen Zhang
Summary: WSe2 quantum dots with exceptional properties were successfully synthesized using liquid phase exfoliation and hydrothermal reaction. The QDs were characterized using various techniques and exhibited good film morphology and effective carrier injection tailoring. Near ultraviolet and normal ultraviolet organic light-emitting diodes (OLEDs) using WSe2 QDs as emitters showed promising performance. Impedance spectroscopy analysis confirmed the tunability of carrier injection in WSe2 QDs. The research provides a new approach for interface modification and the development of WSe2 QDs applications.
Article
Chemistry, Physical
Yiwei Shen, Wenhao Li, Kun Wang, Rong Chen, Chaoxing Wu, Xiongtu Zhou, Yongai Zhang, Yin Xiao, Suling Zhao, Tailiang Guo
Summary: The study successfully demonstrates non-carrier-injection electroluminescence (NCI-EL) from monolayer quantum dots, proposing a working mechanism related to periodic in-well ionization. The effects of driving voltage amplitude, frequency, and quantum dot size on NCI-EL performance are investigated, clarifying the ionization process.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Bei Liu, Mochamad Januar, Jui-Ching Cheng, Koji Hatanaka, Hiroaki Misawa, Kou-Chen Liu
Summary: The article discusses the importance of matching the resonant wavelength of plasmonic nanoparticles with the emission band of organic materials for optimal plasmon-enhanced luminescence in OLEDs. It introduces a design strategy using AuxAg1-x alloy NPs to enable resonance tuning while preserving NP size. Bimetallic NPs, especially with x < 0.6, provide additional degrees of freedom for plasmon wavelength variation and offer benefits of higher scattering and more intense electric fields compared to monometallic NPs.
Article
Materials Science, Multidisciplinary
Jincheng Qu, Dengli Yao, Zichuan Yi, Feng Chi, Liming Liu, Xiaowen Zhang
Summary: Fantastic carbon dots (CDs) with good film morphology and particular electronic properties are facilely synthesized by hydrothermal method. Efficient normal and inverted UV organic light-emitting diodes (LEDs) are demonstrated by tailoring hole and electron injection with CDs-poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and CDs as electron and hole injection layers, respectively. The CDs-based LEDs using pure CDs and CDs-poly(9-vinylcarbazole) as emitters show satisfactory electroluminescent performance.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Optics
Jinpeng Huang, Zelin Hu, Xiang Gao, Yi Xu, Liancheng Wang
Summary: This study proposes a single-chip micro-LED display technology with unidirectional emission through the integration of a resonant cavity and metasurface, which can achieve efficient naked-eye 3D display with a wide viewing angle and multiple viewpoints. The research promotes the application of GaN-based micro-LEDs in displays, especially in 3D displays.
Article
Nanoscience & Nanotechnology
K. Khan, S. Diez, Kai Sun, C. Wurm, U. K. Mishra, E. Ahmadi
Summary: This study reports the observation of self-assembled InGaN/(In)GaN superlattice structure in InGaN film grown on N-polar GaN substrate, with varying In content in each layer depending on growth temperature. By increasing the substrate temperature, a periodic structure was achieved, offering a new pathway for designing and fabricating electronic and optoelectronic devices with enhanced performance.
Article
Nanoscience & Nanotechnology
Ruei-Nan Wu, Chia-Chun Ni, Shaobo Yang, Yang Kuo, Wen-Yen Chang, Yu-Cheng Su, Sheng-Yang Kuo, C. C. Yang
Summary: This study investigates the SP coupling effects under different conditions by overlaying chemically synthesized Ag NPs on InGaN/GaN QW templates and controlling the deformation of Ag NPs. The results indicate that the geometric shape of the contact interface plays a significant role in controlling the SP coupling spectrum and strength.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Genichi Motomura, Taro Uematsu, Susumu Kuwabata, Tatsuya Kameyama, Tsukasa Torimoto, Toshimitsu Tsuzuki
Summary: Researchers fabricated QD light-emitting diodes (QD-LEDs) embedded with Ag-In-Ga-S/GaSx core/shell QDs and improved their luminescence properties by treating the QDs and the electron injection layer with Ga compounds. This effectively suppressed defect-related emission and achieved high color purity in the EL spectra.
ACS APPLIED MATERIALS & INTERFACES
(2023)