scholarly journals Excimer Formation by Steric Twisting in Carbazole and Triphenylamine-Based Host Materials

2015 ◽  
Vol 119 (5) ◽  
pp. 2380-2387 ◽  
Author(s):  
Sergey A. Bagnich ◽  
Stavros Athanasopoulos ◽  
Alexander Rudnick ◽  
Pamela Schroegel ◽  
Irene Bauer ◽  
...  
Keyword(s):  
Host Materials ◽  
Excimer Formation

scholarly journals Controlling excimer formation in indolo[3,2,1-jk]carbazole/9H-carbazole based host materials for RGB PhOLEDs

2018 ◽  
Vol 6 (37) ◽  
pp. 9914-9924 ◽  
Author(s):  
Chenyang Zhao ◽  
Thomas Schwartz ◽  
Berthold Stöger ◽  
Fraser J. White ◽  
Jiangshan Chen ◽  
...  
Keyword(s):  
Molecular Design ◽  
Host Materials ◽  
Excimer Formation

Excimer formation in indolo[3,2,1-jk]carbazole based host materials is controlled by molecular design and the developed materials are employed in efficient red, green and blue PhOLED devices.

scholarly journals Publisher’s Note: “The influence of torsion on excimer formation in bipolar host materials for blue phosphorescent OLEDs” [J. Chem. Phys. 144, 214906 (2016)]

2016 ◽  
Vol 144 (23) ◽  
pp. 239902
Author(s):  
Alexander A. Rudnick ◽  
Sergey Bagnich ◽  
Daniel Wagner ◽  
Stavros Athanasopoulos ◽  
Peter Strohriegl ◽  
...  
Keyword(s):  
Chem Phys ◽  
Host Materials ◽  
Excimer Formation ◽  
Blue Phosphorescent

The influence of torsion on excimer formation in bipolar host materials for blue phosphorescent OLEDs

2016 ◽  
Vol 144 (21) ◽  
pp. 214906 ◽  
Author(s):  
Alexander A. Rudnick ◽  
Sergey Bagnich ◽  
Daniel Wagner ◽  
Stavros Athanasopoulos ◽  
Peter Strohriegl ◽  
...  
Keyword(s):  
Host Materials ◽  
Excimer Formation ◽  
Blue Phosphorescent

Dynamics of Anthracene Excimer Formation within a Water-Soluble Nanocavity at Room Temperature

2021 ◽  
Vol 143 (4) ◽  
pp. 2025-2036
Author(s):  
Aritra Das ◽  
Ashwini Danao ◽  
Shubhojit Banerjee ◽  
A. Mohan Raj ◽  
Gaurav Sharma ◽  
...  
Keyword(s):  
Room Temperature ◽  
Water Soluble ◽  
Excimer Formation

scholarly journals Triplet energies and excimer formation in meta - and para -linked carbazolebiphenyl matrix materials

2015 ◽  
Vol 373 (2044) ◽  
pp. 20140446 ◽  
Author(s):  
Sergey A. Bagnich ◽  
Alexander Rudnick ◽  
Pamela Schroegel ◽  
Peter Strohriegl ◽  
Anna Köhler
Keyword(s):  
Excited State ◽  
Triplet State ◽  
Spectroscopic Investigation ◽  
Triplet Excited State ◽  
Conjugation Length ◽  
Triplet Energy ◽  
Excimer Formation

We present a spectroscopic investigation on the effect of changing the position where carbazole is attached to biphenyl in carbazolebiphenyl (CBP) on the triplet state energies and the propensity to excimer formation. For this, two CBP derivatives have been prepared with the carbazole moieties attached at the ( para ) 4- and 4 ′ -positions ( p CBP) and at the ( meta ) 3- and 3 ′ -positions ( m CBP) of the biphenyls. These compounds are compared to analogous m CDBP and p CDBP, i.e. two highly twisted carbazoledimethylbiphenyls, which have a high triplet energy at about 3.0 eV and tend to form triplet excimers in a neat film. This torsion in the structure is associated with localization of the excited state onto the carbazole moieties. We find that in m CBP and p CBP, excimer formation is prevented by localization of the triplet excited state onto the central moiety. As conjugation can continue from the central biphenyls into the nitrogen of the carbazole in the para -connected p CBP, emission involves mainly the benzidine. By contrast, the meta -linkage in m CBP limits conjugation to the central biphenyl. The associated shorter conjugation length is the reason for the higher triplet energy of 2.8 eV in m CBP compared with the 2.65 eV in p CBP.

scholarly journals Pyridinyl-Carbazole Fragments Containing Host Materials for Efficient Green and Blue Phosphorescent OLEDs

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4615
Author(s):  
Dovydas Blazevicius ◽  
Daiva Tavgeniene ◽  
Simona Sutkuviene ◽  
Ernestas Zaleckas ◽  
Ming-Ruei Jiang ◽  
...  
Keyword(s):  
Current Efficiency ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Power Efficiency ◽  
Triplet Energy ◽  
New Host ◽  
High Brightness ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Host Materials

Pyridinyl-carbazole fragments containing low molar mass compounds as host derivatives H1 and H2 were synthesized, investigated, and used for the preparation of electro-phosphorescent organic light-emitting devices (PhOLEDs). The materials demonstrated high stability against thermal decomposition with the decomposition temperatures of 361–386 °C and were suitable for the preparation of thin amorphous and homogeneous layers with very high values of glass transition temperatures of 127–139 °C. It was determined that triplet energy values of the derivatives are, correspondingly, 2.82 eV for the derivative H1 and 2.81 eV for the host H2. The new derivatives were tested as hosts of emitting layers in blue, as well as in green phosphorescent OLEDs. The blue device with 15 wt.% of the iridium(III)[bis(4,6-difluorophenyl)-pyridinato-N,C2′]picolinate (FIrpic) emitter doping ratio in host material H2 exhibited the best overall characteristics with a power efficiency of 24.9 lm/W, a current efficiency of 23.9 cd/A, and high value of 10.3% of external quantum efficiency at 100 cd/m2. The most efficient green PhOLED with 10 wt% of Ir(ppy)3 {tris(2-phenylpyridine)iridium(III)} in the H2 host showed a power efficiency of 34.1 lm/W, current efficiency of 33.9 cd/A, and a high value of 9.4% for external quantum efficiency at a high brightness of 1000 cd/m2, which is required for lighting applications. These characteristics were obtained in non-optimized PhOLEDs under an ordinary laboratory atmosphere and could be improved in the optimization process. The results demonstrate that some of the new host materials are very promising components for the development of efficient phosphorescent devices.

Catalytic Hexadecachlorophthalocyanine Cobalt-Coated Host Materials for Li–S Batteries

2021 ◽  
Author(s):  
Zhenpu Shi ◽  
Kexin Zhang ◽  
Kai Xiao ◽  
Xingxing Xing ◽  
Huifang Xu ◽  
...  
Keyword(s):  
Host Materials

ortho-, meta-, andpara-Dihydroindenofluorene Derivatives as Host Materials for Phosphorescent OLEDs

2014 ◽  
Vol 127 (4) ◽  
pp. 1192-1196 ◽  
Author(s):  
Maxime Romain ◽  
Sébastien Thiery ◽  
Anna Shirinskaya ◽  
Céline Declairieux ◽  
Denis Tondelier ◽  
...  
Keyword(s):  
Host Materials

Morphological Stable Spirobifluorene/Oxadiazole Hybrids as Bipolar Host Materials for Efficient Green and Red Electrophosphorescence

2010 ◽  
Vol 5 (2) ◽  
pp. 278-284 ◽  
Author(s):  
Youtian Tao ◽  
Liang Ao ◽  
Qiang Wang ◽  
Cheng Zhong ◽  
Chuluo Yang ◽  
...  
Keyword(s):  
Host Materials
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