Article
Chemistry, Multidisciplinary
Xiangyu Fu, Yash Mehta, Yi-An Chen, Lei Lei, Liping Zhu, Nilesh Barange, Qi Dong, Shichen Yin, Juliana Mendes, Siliang He, Renuka Gogusetti, Chih-Hao Chang, Franky So
Summary: The study demonstrates highly directional and polarized light emission from LEDs by selectively diffracting the TE waveguide mode, showing potential for more efficient photonic applications.
ADVANCED MATERIALS
(2021)
Article
Multidisciplinary Sciences
Jin-Hoon Kim, Jin-Woo Park
Summary: An intrinsically stretchable organic light-emitting diode, made of highly stretchable constituent materials, is able to emit light under strains as large as 80%. It has a low turn-on voltage of 8 V and a maximum luminance of 4400 cd m(-2) from both the anode and cathode sides. The device can withstand repeated stretching cycles up to 200 times and shows improved light-emitting efficiency with small stretches up to 50%.
Article
Computer Science, Theory & Methods
Runze Liu, Chau-Wai Wong
Summary: This research examines the characteristics of paper surfaces for authentication purposes using flatbed scanners, finding that specular reflection does not affect normal map estimation and that high spatial-frequency subbands of the heightmap are more powerful for authentication. The study also demonstrates the linear relationship between the edge length of a paper patch and the log(EER) for achieving a certain authentication performance.
IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY
(2021)
Article
Materials Science, Multidisciplinary
Yong-Ho Ra, Cheul-Ro Lee
Summary: A new approach to reduce the size of photonic device chips is reported, utilizing a monolithic light reflector-nanowire LED system. Vertical cavity nanowire structure for surface-lighting emission is developed using selective area epitaxy, with the light reflection provided by Al metal reflector deposited by MBE technique. The approach shows significantly improved light efficiency at specific spectral wavelength, promising a new route for next-generation photonic and electronic devices.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Chemistry, Physical
Lianna Chen, Zhiyuan Qin, Shuming Chen
Summary: In this study, a new method has been developed to achieve high-resolution pixelated emission by controlling the thickness of transparent electrodes, resulting in a color-converting cavity that can selectively convert unpatterned quantum-dot white emission into saturated red, green, and blue emission. This method enables ultrahigh density red, green, and blue emission with a resolution of approximately 1700 pixels per inch, as well as achieving a color gamut of 111% NTSC.
Article
Chemistry, Physical
Xinsu Zhang, Zhibin Zhang, Yixuan Liu, Shuangshuang Shi, Yuan Zhang, Yue Cao, Lingling Li, Chong Geng, Yuanqin Xia, Junjie Zhu, Shu Xu
Summary: A NC-NC Förster resonance energy transfer (FRET) system was developed in semiconductor nanocrystals, utilizing CsPbBr3 NCs as donors and CdSe/CdS NCs as acceptors. The system showed significant reductions in integrated photoluminescence intensity in toluene and octadecene solvents, with a Dexter energy transfer process leading to additional PL enhancement. This proposed system demonstrates improved lightconversion efficiency and anti-quenching properties, making it superior in light down-conversion applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Chemistry, Physical
Taesoo Lee, Minhyung Lee, Hansol Seo, Minjun Kim, Beomsoo Chun, Jeonghun Kwak
Summary: This review summarizes previous studies on top-emitting device structures and discusses ways to improve the performance of top-emitting quantum dot-based light-emitting diodes (TQLEDs). The relevant theories for the optoelectrical properties of TQLEDs are introduced, and advancements in device optimization are presented. Multilateral strategies for TQLEDs to be widely applied in advanced industries are also discussed. This review aims to provide valuable insights for realizing commercial TQLEDs applicable to a broad range of applications.
Review
Materials Science, Multidisciplinary
Deying Kong, Kaiyuan Zhang, Jingjing Tian, Lan Yin, Xing Sheng
Summary: This article provides an overview of recent progress in the development of biocompatible and biodegradable light-emitting materials and devices, including molecular dyes, proteins, and inorganic particles with photoluminescence, material systems with unusual optical properties, and electroluminescent materials and devices with potential for full biodegradation. These advancements are envisioned to offer unique capabilities for a wide range of biomedical applications, from biological sensing and modulation to clinical diagnostics and therapy.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Physics, Applied
C. Symonds, V. Toanen, A. Gassenq, J. -m. Benoit, A. Pereira, E. Cleyet-Merle, R. Fulcrand, F. Bessueille, S. Minot, M. Morassi, A. Lemaitre, J. Bellessa
Summary: This Letter presents a fabrication process for current injection into micrometer-size Ag/GaAs Tamm emitting diodes with special care to avoid surface damages. Electroluminescence from GaAs quantum wells is demonstrated at room temperature, showing dispersion following the Tamm mode. Additionally, for small diameters Tamm structures, electroluminescence occurs in discretized energy modes due to in-plane confinement. This observation of electrically excited emission from a confined diode is a significant advancement towards Tamm plasmon optical devices with novel functionalities.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Kunsik An, Chaewon Kim, Sunkuk Kim, Taesoo Lee, Dongyeol Shin, Jaemin Lim, Donghyo Hahm, Wan Ki Bae, Jun Young Kim, Jeonghun Kwak, Jaehoon Kim, Kyung-Tae Kang
Summary: This paper presents a novel light extraction structure called RaDiNa, which enhances the light extraction capability of top-emitting quantum dot light-emitting diodes (TE-QLEDs). By detaching a polydimethylsiloxane (PDMS) film from a ZnO nanorod (ZnO NR) layer and laying it on top of the TE-QLED, the RaDiNa-attached TE-QLED achieves significantly improved external quantum efficiency (EQE) compared to the reference device. This study provides essential information for the commercialization of TE-QLEDs.
Article
Materials Science, Multidisciplinary
Yunhui Kuang, Lvpeng Yang, Junming Ma, Tong Bie, Di Zhang, Yazhuo Xue, Naigen Zhou, Ming Shao
Summary: This study demonstrates the use of a bifunctional additive, KTFA, to improve the performance of quasi-2D perovskite light-emitting diodes (PeLEDs). The KTFA-modified PeLEDs exhibit high quantum efficiency, high luminance, and emission close to pure red. The devices also show stable spectra and long lifetimes.
ACS MATERIALS LETTERS
(2023)
Review
Optics
Runnan Yu, Changxiao Li, Biao Zhao, Zhan'ao Tan
Summary: This work reviews the research history of green perovskite light-emitting diodes (GPeLEDs), introduces perovskites of different dimensions, and discusses the common synthesis methods of perovskites. Additionally, strategies to improve the stability and luminous efficiency of GPeLEDs are summarized, including component engineering, phase engineering, ligand engineering, additive engineering, interface engineering, and optical coupling structure strategy. Finally, the development state of GPeLEDs is summarized and future prospects are discussed.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Hong Gao, Miaomiao Wang, Yifan Mao, Qingsong Zhao, Cheng Zhang, Ling Jin, Youyi Xia, Weijin Li, Kui Zhang, Haibo Zeng
Summary: Currently available encapsulating materials for WLEDs have limitations, but this study developed promising materials with two significant advantages: direct encapsulation without phosphors and reprocessing for recycling. Blue-light-emitting vitrimers (BEVs) were prepared by reacting epoxy resin with amines, showing strong blue emission and fast stress relaxation. To achieve white-light emission, a well-designed yellow component was grafted into the BEVs, resulting in white-light-emitting vitrimers (WEVs). Using WEV as an encapsulating adhesive, stable white light with CIE coordinates (0.30, 0.32) was successfully achieved for 365nm LED chips without inorganic phosphors, indicating a promising future for WLED encapsulation.
ADVANCED MATERIALS
(2023)
Review
Optics
Nannan Feng, Min Lu, Siqi Sun, Anqi Liu, Xiaomei Chai, Xue Bai, Junhua Hu, Yu Zhang
Summary: In recent years, practical engineering applications such as fiber-optic gyroscope, wavelength division multiplexing, and optical coherence tomography have put forward higher requirements on light sources due to the rapid development of military, optical communication, biological imaging, and other fields. Amplified spontaneous emission (ASE) light source has become an excellent candidate due to its advantages such as suitable bandwidth, low coherence, and high power. This review analyzes the principle of the ASE effect, summarizes the optical gain properties of various gain materials and different structural types of electrically pumped ASE devices, and prospects the development of new ASE light-emitting devices integrated with high-gain materials and low-cost structures.
LASER & PHOTONICS REVIEWS
(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)
