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20 Aug 10:38

New minister aims to boost Greek research

by Christos Dimas

Nature, Published online: 20 August 2019; doi:10.1038/d41586-019-02495-7

New minister aims to boost Greek research
01 Nov 02:19

[ASAP] Role of Associative Charging in the Entropy–Energy Balance of Polyelectrolyte Complexes

by Vikramjit S. Rathee, Hythem Sidky, Benjamin J. Sikora, Jonathan K. Whitmer

TOC Graphic

Journal of the American Chemical Society
DOI: 10.1021/jacs.8b08649
19 Oct 12:41

Naphthyl substituted triphenylamine derivatives as hole transporting materials for efficient red PhOLEDs

Publication date: March 2019

Source: Dyes and Pigments, Volume 162

Author(s): Gintare Krucaite, Dmytro Volyniuk, Jurate Simokaitiene, Saulius Grigalevicius, Chun-Han Lin, Chang-Min Shao, Chih-Hao Chang

Abstract

Naphthyl substituted triphenylamine and its derivatives with bromine atoms were synthesized and investigated. The respective glass transition temperatures of the materials were estimated to be in a range 65–137 °C, which can provide morphologically-stable amorphous films for applications in organic light emitting diodes. The compounds possess adequate ionization potentials (5.5–5.75 eV), high hole drift mobilities (>10−3 cm2/V·s) and suitable triplet energies (∼2.4 eV), which make them suitable hole transporting materials for use in red phosphorescent organic light-emitting diodes. A superior peak efficiency of 17.9% (31.4 cd/A and 26.9 lm/W) was achieved in a device having hole transporting layer of tris[4-(1-naphthyl)phenyl]amine. Furthermore, the device gave efficiencies of 17.7% and 16.6% recorded at luminance levels of 102 and 103 cd/m2. The efficiency drop from the maximum to the value recorded at the luminance of 103 cd/m2 for the device was only 7%.

12 Sep 01:01

Size-dependent loss of aboveground animals differentially affects grassland ecosystem coupling and functions

by A. C. Risch

Size-dependent loss of aboveground animals differentially affects grassland ecosystem coupling and functions

Size-dependent loss of aboveground animals differentially affects grassland ecosystem coupling and functions, Published online: 11 September 2018; doi:10.1038/s41467-018-06105-4

Defaunation can have impacts on ecosystem functioning that are currently little understood. Using an exclusion experiment, Risch et al. show the impacts of vertebrate and invertebrate losses on ecosystem coupling, particularly emphasising the role of invertebrates in ecosystem functioning.
14 Sep 02:45

Frontispiece: Clicking the Arsenic–Carbon Triple Bond: An Entry into a New Class of Arsenic Heterocycles

by Gregor Pfeifer, Martin Papke, Daniel Frost, Julian A. W. Sklorz, Marija Habicht, Christian Müller
Thumbnail image of graphical abstract

Arsenic Heterocycles In their Communication on page 11760 ff. C. Müller et al. report a hitherto unknown triazaarsole. The synthesis was accomplished through a [3+2] cycloaddition reaction between an arsaalkyne and an organic azide.