Results 71 to 80 of about 67,512 (308)

Bay‐functionalized [7]Helicene Bilayer Nanographenes

Advanced Optical Materials, EarlyView.
Bay‐functionalized [7]helical bilayer nanographenes are synthesized via a scalable, modular strategy enabling late‐stage diversification. Tailored methoxy, diketone, and phenazine substitutions precisely tune redox, photophysical, and chiroptical properties, delivering strong electronic circular dichroism and bright circularly polarized luminescence ...
Anmol Thanai, Vikas Sharma, Louis Minion, Hassan Khan, Hadeel Abbas, George F. S. Whitehead, Avantika Hasija, Jessica Wade, Matthew John Fuchter, Ashok Keerthi   +9 more
wiley   +1 more source

Highly Efficient Pure‐Blue Single‐Layer Organic Light‐Emitting Diodes Without High‐Triplet‐Energy Auxiliary Materials

Advanced Optical Materials, EarlyView.
Blue organic light‐emitting diodes (OLEDs) comprising triplet‐harvesting emitters require the use of high‐triplet‐energy hosts and blocking layers to confine the triplet excitons to the emitter. Here, we present efficient single‐layer blue hyperfluorescent OLEDs comprising solely of a matrix‐free emissive layer between two charge‐injecting electrodes ...
Xiao Tan, Manish Kumar, Oskar Sachnik, Rishabh Saxena, Paul W. M. Blom, Gert‐Jan A. H. Wetzelaer   +5 more
wiley   +1 more source

Mobile Communication

Himalayan Physics, 2013
With the improvements in communication technologies and the increased need for mobile communication among users, the mobile communication industry has been faced with fast-paced developments in the last few decades. The developments in mobile communication technologies provide opportunities that cannot be provided by traditional communication tools ...
Ozlem Hesapci-Sanaktekin, Irem Somer
openaire   +3 more sources

Visible‐Light Photoprogrammable Transistors Enabled by an All‐Organic Triplet‐Sensitized Diarylethene Channel Layer

Advanced Optical Materials, EarlyView.
All‐organic channel‐layer OFETs are shown to enable visible‐light photoprogramming via triplet‐sensitized diarylethene switching. Preferential localization of the photoswitch and organic sensitizer in intercrystalline amorphous domains preserves polymer crystalline packing while ensuring short‐range Dexter‐type triplet–triplet energy transfer and solid‐
Jieun Kwon, Syed Zahid Hassan, Gayoung Ham, Seonghyeon Kang, Geoneop Choi, Sanghyeok An, Hye Ryun Sim, Suryeon Jang, Chang Yun Son, Hyojung Cha, Dae Sung Chung   +10 more
wiley   +1 more source

ZnCl2 Post‐Treatment Enables High‐Efficiency Violet CsPbCl3 Quantum Dot LEDs

Advanced Optical Materials, EarlyView.
Schematic illustration of ZnCl2 post‐treatment–induced doping in CsPbCl3 quantum dots (QDs). ABSTRACT Perovskite light‐emitting diodes (LEDs) have achieved external quantum efficiencies (EQEs) above 20% in the red, green, and blue spectral regions, yet their efficiency rapidly declines as the bandgap widens for shorter‐wavelength emission.
Po‐Hsien Lai, Chien‐Cheng Li, Tien‐Lin Wu, Chih‐Shan Tan   +3 more
wiley   +1 more source

Spectral Efficiency Analysis for Bidirectional Dynamic Network With Massive MIMO Under Imperfect CSI

IEEE Access, 2018
To cope with the exploding demand for higher data rate and the heavier asymmetry of downlink (DL) and uplink (UL) traffic, dynamic time-division duplex (DTDD) has been proposed, where the time resources can be adjusted dynamically between DL and UL ...
Qian Lv, Jiamin Li, Pengcheng Zhu, Xiaohu You   +3 more
doaj   +1 more source

Experimental Evidence of Free Carrier Generation in 2D Hybrid Organic–Inorganic Perovskites

Advanced Optical Materials, EarlyView.
ABSTRACT Despite the significant potential of 2D hybrid organic–inorganic perovskites (2DHOIPs) for high‐efficiency optoelectronics application‐comparable to their 3D counterparts, the fundamental carrier photogeneration remains unclear. In contrast to conventional ultrafast optical property characterization, we use ultrafast photocurrent spectroscopy ...
Tuhin Ghosh, Pan Adhikari, Yao Gao, Apparao M. Rao, Dawen Li, Haimei Zheng, Ying Shi, Letian Dou, Jianbo Gao   +8 more
wiley   +1 more source

Energy Efficiency Optimization for MIMO Distributed Antenna Systems With Pilot Contamination

IEEE Access, 2018
In this paper, we study the energy-efficiency (EE) maximization problem for a multiple-input multiple-output distributed antenna system (DAS) with pilot contamination.
Jun Xu, Pengcheng Zhu, Jiamin Li, Xiaohu You   +3 more
doaj   +1 more source

Overview of Mobile Communications in Colombia and Introduction to 5G. [PDF]

Sensors (Basel), 2023
Barrios-Ulloa A, Cama-Pinto D, Arrabal-Campos FM, Martínez-Lao JA, Monsalvo-Amaris J, Hernández-López A, Cama-Pinto A.   +6 more
europepmc   +1 more source

Mobile Communication

International Journal of Smart Sensor and Adhoc Network., 2011
Consumers demand more from their technology. Whether it be a television, cellular phone, or refrigerator, the latest technology purchase must have new features. With the advent of the Internet, the most-wanted feature is better, faster access to information.
D. S. Jadhav, P.P. Waghmare
openaire   +1 more source