Tetraphenylpyrazine decorated 1,3-di(9H-carbazol-9-yl)benzene (mCP): a new AIE-active host with enhanced performance in organic light-emitting diodes

Abstract

Decorating a conventional mCP host with a tetraphenylpyrazine moiety generates a new AIE-active host, from which better device performance was realized.

Axially Chiral Bis-Cycloplatinated Binaphthalenes and Octahydro-Binaphthalenes for Efficient Circularly Polarized Phosphorescence in Solution-Processed Organic Light-Emitting Diodes

“…Combining high emission quantum yields and asymmetry factors, ( R )/( S )-[tmd] and ( R )/( S )-[H 8 -tmd] were used as dopants in an emitting layer (EML) to fabricate cost-effective and large-area CP-OLEDs by a wet method. To avoid the triplet–triplet annihilation of phosphorescent complexes, TCTA and 1,3-di-9-carbazolylbenzene (mCP) were selected as hole-transport host material, and 1,3-bis­(5-(4-( tert -butyl)­phenyl)-1,3,4-oxadiazol-2-yl)­benzene (OXD-7) was selected as electron-transport host materials, which possess high triplet state energy (2.5–3.3 eV) to ensure an efficient energy transfer from the host to phosphorescent complexes. − Besides, mixed hole-transport and electron-transport host materials could effectively promote the carrier balance in OLEDs. The HOMO and LUMO energy levels of binuclear Pt­(II) complexes lie between the host materials TCTA, mCP, and OXD-7, which further indicates that they can be used as host materials in CP-OLEDs.…”

Theoretical insights into the central “acceptor” bridge function on the whole visible light and near-infrared emission in tetraphenylpyrazine-based luminogens

“…3 Since its discovery in the year 2015, TPP derivatives have attracted tremendous interest for their specific applications in the energy, material and biomedical fields. 4–6 Recently, we investigated the AEE mechanism of TPP-based luminogens in theory. 7 It was found that the restricted rotations of the four peripheral phenyls attached to the pyrazine core are responsible for the AEE characteristics.…”

R–D–A and R–D−π–A Structured AIEgens: Relationship between Electronic, Conformational Characteristics and Photophysical Properties

“…This unique optical characteristic provides a perfect solution for the problem of aggregation-caused quenching (ACQ), which widely exists in traditional organic light-emitting molecules. AIEgens have been applied in various fields, such as electroluminescent devices, − biological imaging, − chemical sensing, − and so forth. It is widely recognized that the AIE phenomenon is realized through the restricted intramolecular motion (RIM). − In the past decade, much efforts were paid to construct AIEgens based on the RIM mechanism. − …”