Phenanthro[9,10-d]imidazole with thiophene rings toward OLEDs application

Kula, Sławomir; Szłapa-Kula, Agata; Kotowicz, Sonia; Filapek, Michał; Bujak, Karolina; Siwy, Mariola; Janeczek, Henryk; Maćkowski, Sebastian; Schab‐Balcerzak, Ewa

doi:10.1016/j.dyepig.2018.07.014

Cited by 22 publications

(21 citation statements)

References 44 publications

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“…The presence of the glass transition temperature confirmed the ability of investigated molecules to transform from crystalline into the amorphous state. Thus, bis-(imino-1,8-naphthalimide) derivatives are molecular glasses [ 45 , 63 ]. The lack of tendency for crystallization in the second heating scan was confirmed for 1a–3a and 1d, which means that the presented molecules are stable molecular glasses.…”

Section: Resultsmentioning

confidence: 99%

New Acceptor–Donor–Acceptor Systems Based on Bis-(Imino-1,8-Naphthalimide)

et al. 2021

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In this paper, six novel symmetrical bis-(imino-1,8-naphthalimides) differing in core and N-substituent structure were synthesized, and their thermal (TGA, DSC), optical (UV-Vis, PL), electrochemical (DPV, CV) properties were evaluated. The compounds were stable to 280 °C and could be transferred into amorphous materials. Electrochemical investigations showed their ability to occur reductions and oxidations processes. They exhibited deep LUMO levels of about −3.22 eV and HOMO levels above −5.80 eV. The optical investigations were carried out in the solutions (polar and non-polar) and in films and blends with PVK:PBD. Bis-(imino-1,8-naphthalimides) absorbed electromagnetic radiation in the range of 243–415 nm and emitted light from blue to yellow. Their capacity for light emission under voltage was preliminarily tested in devices with an active layer consisting of a neat compound and a blend with PVK:PBD. The diodes emitted green or red light.

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Section: Resultsmentioning

confidence: 99%

New Acceptor–Donor–Acceptor Systems Based on Bis-(Imino-1,8-Naphthalimide)

et al. 2021

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“…Thin polymer films have found many important applications in organic electronics, such as active layers, protective layers, or antistatic layers. A good, specific example of this is the wide range of applications for organic semiconductor poly(3,4-ethylene dioxythiophene) (PEDOT) doped with poly(4-styrenesulfonate) (PSS), which include energy conversion applications (solar cells), antistatic and conductive coatings, capacitors, touch panels, organic light emitting diodes, and printed organic electronics. − Other examples of widely studied thin organic layers are thin layers of poly(3-hexylthiophene-2,5-diyl) (P3HT) and (6,6)-phenyl-C61-butyric (PCBM) explored as active layers in bulk organic solar cells. − Optimization of their effectiveness has become an active branch of research and can be carried out using various physical methods, − e.g., by thermal or vapor annealing, by dopant addition, , or by introducing auxiliary layers to photovoltaic structures …”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Spectroscopic Ellipsometry of Thin Polymer Films

2020

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Thin polymer films have found many important applications in organic electronics, such as active layers, protective layers, or antistatic layers. Among the various experimental methods suitable for studying the thermo-optical properties of thin polymer films, temperature-dependent spectroscopic ellipsometry plays a special role as a nondestructive and very sensitive optical technique. In this Review Article, issues related to the physical origin of the dependence of ellipsometric angles on temperature are surveyed. In addition, the Review Article discusses the use of temperature-dependent spectroscopic ellipsometry for studying phase transitions in thin polymer films. The benefits of studying thermal transitions using different cooling/heating speeds are also discussed. Furthermore, it is shown how the analysis and modeling of raw ellipsometric data can be used to determine the thermal properties of thin polymer films.

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“…It is important for the efficient electro-phosphorescence that the triplet level energy of a used host derivative would be higher than that of the used triplet dopant to prevent reverse energy transmittance from the emitter back to the host and to confine as many as possible triplet excitons on guest structures [ 11 , 12 , 13 ]. Another requirement for the effective operation of the PhOLEDs is the ability of the host to create amorphous and stable layers with high values of the glass transition temperature.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Phenanthro[9,10-d]imidazole with thiophene rings toward OLEDs application

Cited by 22 publications

References 44 publications

New Acceptor–Donor–Acceptor Systems Based on Bis-(Imino-1,8-Naphthalimide)

New Acceptor–Donor–Acceptor Systems Based on Bis-(Imino-1,8-Naphthalimide)

Temperature-Dependent Spectroscopic Ellipsometry of Thin Polymer Films

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

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