Results 61 to 70 of about 25,797 (319)

Role of the Recombination Zone in Organic Light‐Emitting Devices

Advanced Materials, EarlyView.
This review summarizes the critical role of the recombination zone in organic light‐emitting diodes (OLEDs). We highlight that broadening the recombination zone in OLEDs based on emissive layers with balanced charge transport and high photoluminescence quantum yields provides a promising route toward achieving both long operational lifetime and high ...
Yungui Li, Karl Leo
wiley   +1 more source

Functionalized fluorenes via dicationic electrophiles [PDF]

Tetrahedron Letters, 2019
Dicationic fluorenyl cations are shown to react with nitriles to provide amide-functionalized fluorenes. A similar reaction with alcohols gives ether derivatives. The chemistry is initiated by the reactions of N-heterocyclic ketones in a superacidic solution. This leads to cyclizations involving 2-biphenyl groups and formation of the reactive fluorenyl
Michael R, Stentzel, Douglas A, Klumpp
openaire   +2 more sources

Aggregation‐Induced Emission Molecular Design for Mitigating Non‐Radiative Energy Loss in Organic Solar Cells

Advanced Materials, EarlyView.
Aggregation‐induced emission strategy is first used to overcome aggregation‐caused quenching in Y‐series acceptors. By integrating tetraphenylethylene, the dTPE exhibits three‐fold PLQY enhancement and significantly suppressed non‐radiative energy loss. An ultra‐low Eloss of 0.130 eV and a record VOC of 0.93 V are achieved, resulting in a PCE over 20.5%
Yingze Zhang, Rongkun Zhou, Mingjie Rong, Xianghao Zeng, Ho Ming Ng, Ruijie Ma, Joshua Yuk Lin Lai, Chao Li, Shuwei Qiu, Heng Liu, Hao Xia, Lei Zhu, Guangye Zhang, Xinhui Lu, Zilong Zheng, Jun Liu, He Yan, Sai Ho Pun, Gang Li   +18 more
wiley   +1 more source

Synthesis of UV-resistant and colorless polyimide films for optoelectrical applications

npj Materials Degradation
Due to their excellent mechanical properties and intrinsic flexibility, polyimides (PIs) are promising candidates for optoelectrical applications under harsh conditions such as flexible organic solar cells as well as flexible smart windows, etc.
Le Xi, Yadong Lv, Jiabao Feng, Yanyan Huang, Yajiang Huang, Qi Yang, Guangxian Li, Miqiu Kong   +7 more
doaj   +1 more source

C(sp3)-H hydroxylation of fluorenes, oxindoles and benzofuranones with a Mg(NO3)2-HP(O)Ph2 oxidation system.

Organic Chemistry Frontiers, 2019
A novel oxidation system in which magnesium nitrate [Mg(NO3)2] is used as an oxidant in the presence of diphe-nylphosphine oxide [HP(O)Ph2] permits the C(sp3)-H hydroxylation of fluorenes, oxindoles, and benzofuranones.
Cheng Hu, Gang Hong, Pradip D. Nahide, Yuchen He, Chen Zhou, M. Kozlowski, Limin Wang   +6 more
semanticscholar   +1 more source

Magnitude and Extent of Contaminated Sediment and Toxicity in Chesapeake Bay [PDF]

, 2007
INTRODUCTION: This report summarizes the results of NOAA's sediment toxicity, chemistry, and benthic community studies in the Chesapeake Bay estuary. As part of the National Status and Trends (NS&T) Program, NOAA has conducted studies to determine the
Hameedi, Jawed, Hartwell, S. Ian
core  

Thermal high pressure hydrogenolysis II. The thermal high pressure hydrocracking of fluorene [PDF]

, 1973
The thermal hydrocracking of fluorene was investigated in the temperature range of 400 to 480 °C and hydrogen pressures of up to 375 atm. As main reaction products were found 2-methylbiphenyl, biphenyl, toluene and benzene.
Konter, Willem A.N., Oltay, Ernst, Penninger, Johannes M.L.   +2 more
core   +4 more sources

Universal Fluorine‐Free Proton Exchange Polymers for High‐Performance and Durable Fuel Cells Operable Under Severe Conditions

Advanced Materials, EarlyView.
Due to excellent physical and chemical stability, the novel designed fluorine‐free polymers with aliphatic‐chain backbones (SP‐PAC12‐QP) are regarded as promising and universal alternatives to perfluorosulfonic acid membranes. Their performances are further improved by physical reinforcement, where the fuel cell performance under high temperature and ...
Fanghua Liu, Kenji Miyatake, Ick Soo Kim, Ahmed Mohamed Ahmed Mahmoud, Vikrant Yadav, Fang Xian   +5 more
wiley   +1 more source

Molecular Engineering for Enhanced Second‐Order Nonlinear Response in Spontaneously‐Oriented Evaporated Organic Films

Advanced Optical Materials, EarlyView.
Intramolecular bridge‐locking frustrates detrimental anti‐parallel packing in evaporated organic films. This design enhances net polar orientation, leading to a twofold off‐resonance increase in the second‐order nonlinear susceptibility (χ(2)) without electric‐field poling.
Pierre‐Luc Thériault, Heorhii V. Humeniuk, Zhechang He, Gabriel Juteau, Alexandre Malinge, Dmytro F. Perepichka, Stéphane Kéna‐Cohen   +6 more
wiley   +1 more source

A denitrogenative palladium-catalyzed cascade for regioselective synthesis of fluorenes†

Chemical Science, 2019
We herein report a denitrogenative palladium-catalyzed cascade for the modular and regioselective synthesis of polysubstituted fluorenes. Hydrazone facilitates the Pd(ii) to Pd(iv) oxidative addition in a Catellani pathway and is also the methylene ...
Wai Chung Fu, F. Kwong
semanticscholar   +1 more source