Article
Chemistry, Multidisciplinary
Junho Kim, Ki-Won Seo, SeungJae Lee, Kyungmin Kim, Changjo Kim, Jung-Yong Lee
Summary: In this study, a novel all-in-one process for exchanging ligands and halide anions in film-state is proposed to achieve facile color tuning and patterning of PeQD LEDs. The performance of PeQD LEDs is significantly enhanced by passivating the PeQD with shorter ligands. The all-in-one process is more stable in the film state and facilitates rapid color change in localized areas, enabling the fabrication of fine patterns using simple contact masks.
Article
Chemistry, Multidisciplinary
Philipp Grimm, Stefan Zeissner, Maximilian Roedel, Simon Wiegand, Sebastian Hammer, Monika Emmerling, Enno Schatz, Rene Kullock, Jens Pflaum, Bert Hecht
Summary: This study presents a nanoscale organic light-emitting antenna (OLEA) structure that serves as a color- and directionality-switchable light source. The structure utilizes gold nanoantennas and an organic semiconductor to achieve color and emission direction switching based on the polarity of the applied voltage. The OLEA structure facilitates efficient radiation transfer and eliminates the need for transparent electrodes.
Article
Agricultural Engineering
Xiuye Wei, Xinlin Zhao, Songhua Long, Qingmei Xiao, Yuan Guo, Caisheng Qiu, Huajiao Qiu, Yufu Wang
Summary: This study investigated the effects of different LED light qualities on the growth and cannabinoid synthesis of hemp. Results showed that LED2 and LED5 could effectively promote hemp growth and increase CBD content. LED2 and LED5 may be good choices for indoor farming of hemp targeted for higher CBD yield.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Review
Materials Science, Multidisciplinary
Teng Ma, Jun Chen, Ziyi Chen, Lumeng Liang, Jinning Hu, Weili Shen, Zhenhua Li, Haibo Zeng
Summary: This article introduces the excellent performance of Micro-LED as a new generation of display technology in the display market, and details the methods for achieving Micro-LED full-color display from a technical perspective, as well as the current research achievements and challenges.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Inorganic & Nuclear
R. B. Basavaraj, Santosh Kumar, D. P. Aarti, G. Nagaraju, H. M. Suresh Kumar, R. Soundar, T. S. Shashidhara, H. N. Sumedha, M. Shahsank
Summary: In this study, orange-red light emitting BaZrO3 (BZO) nanopowders doped with Sm3+ ions were successfully prepared using Aloe vera gel as a surfactant. The structural and optical properties of BZO:Sm3+ were characterized using various techniques, demonstrating its potential for photovoltaic applications as a high thermal stability orange-red light producing element.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Optics
Xiangbo Zhou, Kunjie Ma, Mingming Jiang, Changzong Miao, Caixia Kan, Daning Shi
Summary: High-brightness and high-efficiency low-dimensional light sources have been achieved by synthesizing ZnO microwires with heavily Ga-impurity using chemical vapor deposition methods, and assembling them directly on p-GaN substrate to form heterostructure light-emitting devices. The single microwire acts as a conductance electrode and efficient luminescence layer, emitting bright blue/green lighting under forward bias, and strong broadband white emission under reverse bias, with the ability to switch between colors. This color-switchable light-emitting diode based on single microwires holds promise for miniaturized, smart light sources with independent control over color and brightness.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Kangmin Wang, Ruike Hu, Jingyu Wang, Jingxian Zhang, Junxiang Liu, Bijin Li, Liang Zhou, Linsen Zhou
Summary: In this study, a compound with reversible excited-state intramolecular proton transfer (ESIPT) was synthesized and used in the fabrication of organic white light-emitting devices. The devices showed white electroluminescence and achieved a high external quantum efficiency. The characteristics of the compound were confirmed through fluorescence testing.
ACS MATERIALS LETTERS
(2022)
Article
Optics
Jingxin Nie, Zhizhong Chen, Fei Jiao, Jinglin Zhan, Yifan Chen, Yiyong Chen, Zuojian Pan, Xiangning Kang, Yongzhi Wang, Qi Wang, Tianhang Zhou, Weimin Dang, Wentian Dong, Shuzhe Zhou, Xin Yu, Guoyi Zhang, Bo Shen
Summary: The study uses purple and azure LEDs for mixing to achieve high color fidelity white light, following the relevant chromaticity diagram for selecting other monochromatic LEDs. By optimizing peak wavelengths with mathematical models and constraints on chromaticity coordinates, the blue light hazard efficiency of the white light is kept below 0.06. Comprehensive measurements reveal high color rendering index, color fidelity score, and color gamut score for the mixed white light.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Danyang Li, Junjie Wang, Jian Wang, Junbiao Peng
Summary: Perovskite materials can transition from green light to the full-visible light spectrum through halogen anion exchange. In this study, an in-situ solid-phase anion-exchange method combined with inkjet printing was employed to achieve full-color perovskite quantum dot light-emitting diodes (PeQD-LEDs). The dielectric constant of the anion-exchange medium solvent was found to affect the anion-exchange rate, and solvents with higher dielectric constant resulted in faster reaction rates and more defects. The chain length of amine salts in the anion-exchange medium solute also played a key role in the stability of electroluminescence spectra.
SCIENCE CHINA-CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
G. R. Revannasiddappa, R. B. Basavaraj, M. S. Rudresha, G. Nagaraju, Santosh Kumar, N. Sasidhar
Summary: In this study, a series of Dy3+ doped Ca2MgSi2O7 nanopowders were successfully synthesized using a green combustion technique with Aloe vera gel as fuel. The fabricated samples exhibited good phase transparency and a single-phase tetragonal structure. Characterization techniques such as diffuse reflectance spectroscopy, scanning electron microscopy, and photoluminescence analysis provided insights into the energy band gap values, morphological features, and emission peaks, respectively. The results indicated that the synthesized nanopowders have potential applications in cool white light emitting diodes (wLEDs) and forensic studies.
Article
Chemistry, Multidisciplinary
Jia-Sheng Li, Yong Tang, Zong-Tao Li, Jie-Xin Li, Xin-Rui Ding, Bin-Hai Yu, Shu-Dong Yu, Jian-Zhen Ou, Hao-Chung Kuo
Summary: The study shows that high refractive index, pore structure with comparable size, and lower QD adsorption amount contribute to enhanced QD light extraction efficiency. By optimizing packaging methods and NP mass ratio, highly efficient QD white LEDs were developed, achieving luminous efficacy comparable to phosphor-based white LEDs and paving the way for commercialization of white LEDs solely using QDs as converters in the future.
Article
Nanoscience & Nanotechnology
Alexandre Bachelet, Sophie Fasquel, Jean-Michel Rampnoux, Gediminas Jonusauskas, Kazuo Takimiya, Lionel Hirsch, Mathias Perrin, Mamatimin Abbas
Summary: Using a single emissive layer, this study achieved color tuning within a wide visible light range (from blue to red) in organic light emitting transistors. The color tuning does not affect the optical turn-on voltages and significantly enhanced external quantum efficiencies are observed for devices with a thick emissive layer. The wide range of color tunability is mainly due to an outcoupling effect through the Fabry-Perot cavity.
Article
Chemistry, Physical
Min Joo Park, Abu Bashar Mohammad Hamidul Islam, Yu-Jung Cha, Joon Seop Kwak
Summary: This study fabricated a-plane nanopillar LED based on nonpolar InGaN/GaN single quantum-well using a top-down fabrication method, with self-aligned In3Sn nanodots as etching masks. The fabricated nanopillars showed high yield and a large height-to-diameter aspect ratio as observed by scanning electron microscopy characteristics. The size of the nanopillars depended on the size of In3Sn nanodots, which were fabricated from ITO thin film using a 3% HCl solution.
APPLIED SURFACE SCIENCE
(2021)
Article
Construction & Building Technology
Zhafirah Ajrina, Revantino, Rizki A. Mangkuto, Suprijanto, F. X. Nugroho Soelami
Summary: This study investigates the impact of different CCT values of tunable LED lamps on the color appearance of interior finishing samples. Results show significant chromaticity coordinate differences for different colors of materials under different CCT values, with the light green sample being the least sensitive to changes in CCT values.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Yun Zhao, Bingli Gu, Guoqiang Guo, Yanshuang Li, Tingting Li, Yuejin Zhu, Xu Wang, Da Chen
Summary: Blue, green, and red graphene quantum dots (GQDs) were synthesized and used for pattern printing and multicolor anticounterfeiting. White light-emitting diodes (LEDs) with high color rendering index and correlated color temperature were fabricated. This research expands the potential applications of GQDs in anticounterfeiting and LED technology.
ACS APPLIED NANO MATERIALS
(2023)
