Results 51 to 60 of about 23,878 (272)

Facile one-step synthesis of efficient hybridized local and charge transfer emitter for ultraviolet electroluminescence with low roll-off. [PDF]

Smart Mol
An effective hybridized local and charge‐transfer emitter D3CZ4F featuring multiple C–H⋯F locking interactions was developed, achieving an outstanding EQE of 8.97%, a small roll‐off, an emission peak at 388 nm, and color coordinates of (0.165, 0.025), respectively.
Wang S, Wang J, Xie D, Peng L, Liu Y, Wang J, Ying S, Ma D, Yan S.   +8 more
europepmc   +2 more sources

Electroluminescence from Rare Earth Activated Materials - New Concepts [PDF]

, 1993
The recent progress in the field of thin film electroluminescence devices is reviewed. The mechanisms responsible for rare earth excitation in high electric field electroluminescence structures are explained.
Godlewski, M.
core   +1 more source

When Poor Exciton Dissociation Limits Photocurrents in Organic Solar Cells: Why Low Offset Non‐Fullerene Acceptor Blends Can't Be Efficient

Advanced Materials, EarlyView.
The energetic offset between the donor and the acceptor components in organic photoactive layers is central to the tradeoff between photovoltage and photocurrent losses. This Perspective covers the most important issues surrounding this topic in non‐fullerene acceptor blends, from the difficulty of accurately determining state energies and driving ...
Dieter Neher, Manasi Pranav
wiley   +1 more source

Cross-Characterization for Imaging Parasitic Resistive Losses in Thin-Film Photovoltaic Modules

Journal of Imaging, 2016
Thin-film photovoltaic (PV) modules often suffer from a variety of parasitic resistive losses in transparent conductive oxide (TCO) and absorber layers that significantly affect the module electrical performance.
Archana Sinha, Martin Bliss, Xiaofeng Wu, Subinoy Roy, Ralph Gottschalg, Rajesh Gupta   +5 more
doaj   +1 more source

Electroluminescence of InGaN/GaN heterostructures at the reverse bias and nitrogen temperature [PDF]

, 2015
The electroluminescence spectra at reverse biases in LED InGaN/GaN heterostructures at liquid nitrogen temperatures were studied. At the reverse bias and T = 77 K, avalanche microplasmas breakdowns were observed.
Veleschuk, V, Khmil, D, Kisselyuk, M, Vlasenko, Z, Borshch, V, Vlasenko, A   +5 more
core   +1 more source

Rigid Boron‐Fused Frameworks for Efficient Near‐Infrared Emission and Optical Gain Beyond 900 nm

Advanced Optical Materials, EarlyView.
Multiple‐resonance (MR)‐derived boron‐fused frameworks were integrated into narrow‐gap, long‐range charge‐transfer emitters to reduce structural relaxation and electron‐vibrational coupling. This strategy significantly decreases nonradiative losses, leading to improved near‐infrared (NIR) luminescence efficiency and low‐threshold amplified spontaneous ...
Masashi Mamada, Atsushi Hatanaka, Masahiro Hayakawa, Shintaro Kohata, Chihaya Adachi, Hajime Nakanotani, Takuji Hatakeyama   +6 more
wiley   +1 more source

Mechanism of Improved Luminescence Intensity of Ultraviolet Light Emitting Diodes (UV-LEDs) Under Thermal and Chemical Treatments

IEEE Photonics Journal, 2019
In this work, the influences of thermal annealing and chemical passivation on the optical and electrical properties of ultraviolet light-emitting-diode (UV-LED) were investigated.
Moheb Sheikhi, Wei Guo, Yijun Dai, Mei Cui, Jason Hoo, Shiping Guo, Liang Xu, Jianzhe Liu, Jichun Ye   +8 more
doaj   +1 more source

Wafer-Scale Semipolar Micro-Pyramid Lighting-Emitting Diode Array

Crystals, 2021
InGaN-based micro-structured light-emitting diodes (µLEDs) play a critical role in the field of full-color display. In this work, selected area growth (SAG) of a micro-pyramid LED array was performed on a 2-inch wafer-scale patterned SiO2 template ...
Shuo Zhang, Yan Yan, Tao Feng, Yue Yin, Fang Ren, Meng Liang, Chaoxing Wu, Xiaoyan Yi, Junxi Wang, Jinmin Li, Zhiqiang Liu   +10 more
doaj   +1 more source

Residual Tetramethylammonium Hydroxide Limits ZnO Nanoparticle‐Based Quantum Dot Light‐Emitting Diode Performance

Advanced Optical Materials, EarlyView.
Residual tetramethylammonium hydroxide (TMAH) from ZnO nanoparticle (NP) synthesis is uncovered as a hidden impurity that migrates into quantum dot emissive layers during thermal processing. The resulting exciton quenching reduces the efficiency of quantum dot light‐emitting diodes despite improved electron transport upon annealing.
Ganghyun Park, Joonyeon Hwang, Hayeon Seo, Jisu Hwang, Jinsu Park, Wan Ki Bae, Jeonghun Kwak   +6 more
wiley   +1 more source

Origin of Enhanced Efficiency and Reduced Roll‐Off in Organic Light‐Emitting Diodes Based on Pt(II) Complexes

Advanced Science, EarlyView.
Controlled Pt–Pt fine structure in square‐planar Pt(II) complexes governs metal–metal‐to‐ligand charge‐transfer (MMLCT) state formation, exciton dynamics, and organic light‐emitting diode performance. Short Pt–Pt contacts in Pt(fppz)2 enable coherent metal–metal coupling, sub‐microsecond emission and an external quantum efficiency of 29%, whereas ...
Atul Shukla, Sarah K. M. McGregor, Julian A. Steele, Innes K. Gale, Kiyoshi Miyata, Monirul Hassan, Christian McDonald, Romain J. Lepage, Eduardo Solano, Pilankatta K. Ramya, Cherumuttathu H. Suresh, Takumi Ehara, Chihaya Adachi, Ken Onda, Shih‐Chun Lo, Ebinazar B. Namdas   +15 more
wiley   +1 more source