Near‐Infrared Electroluminescence beyond 800 nm with High Efficiency and Radiance from Anthracene Cored Emitters

Abstract

Derivatives based on anthryleno[1,2-b]pyrazine-2,3dicarbonitrile (DCPA) are used as luminescent materials,t o realizen ear-infrared (NIR) electroluminescence.Byf unctionalizing DCPAw ith aromatic amine donors,t wo emitters named DCPA-TPAa nd DCPA-BBPAa re designed and synthesized.Both molecules have large dipole moments owing to the strong intramolecular charge transfer interactions between the amine donors and the DCPAa cceptor.T hus, compared with doped films,t he emission of neat films of DCPA-TPAa nd DCPA-BBPAc an fully fall into the NIR region (> 700 nm) with increasing surrounding polarity by increasing doping ratio.M oreover,t he non-doped devices based on DCPA-TPAa nd DCPA-BBPAp rovideN IR emission with peaks at 838 and 916 nm, respectively.Amaximum radiance of 20707 mW Sr À1 m À2 was realized for the further optimizedd evice based on DCPA-TPA. This work provides as imple and efficient strategy of molecular design for developing NIR emitting materials.

Different molecular conformation and packing determining mechanochromism and room-temperature phosphorescence

“…The Cz and diphenylamine are N-containing heterocyclic donors and the sizes of the functional groups are similar to acridine [53]. More importantly, DMAC exhibits folded or planar conformations as reported in literatures [49][50][51][52], the twisted conformation of diphenylamine is similar to the folded conformation of DMAC and the planar conformation of Cz is similar to the planar conformation of DMAC group [54][55][56][57], which would help to deeply understand the effect of stacking on the performance through structural comparison. As expected, two polymorphs (Crystal G and Crystal Y) of DBTDO-DMAC were successfully obtained, with different conformations and packing.…”

Near‐Infrared Electroluminescence beyond 800 nm with High Efficiency and Radiance from Anthracene Cored Emitters

“…Single-crystalstructure and cross-stacking packing mode of DCPA-TPA. [25] Angewandte Chemie Forschungsartikel the cross-stacking dimer is 3.35 .And the distance between the adjacent dimer is 3.33 .Furthermore,the crossing angle of the dimer is about 758 8.Such apacking mode indicates the cross-stacking dimer of DCPA-TPAc an effectively narrow the energy gap. [23] Electroluminescence Properties…”

Green‐, Red‐, and Infrared‐Emitting Polymorphs of Sterically Hindered Push–Pull Substituted Stilbenes

“…There are generally two ways to tune the position of emission maxima. The first one, intramolecular, modifies the strength of (usually) the electron acceptor, [14] for example, by adding an additional CN group [10] or by a conjugation extension, [16] whereas the second, intermolecular, modifies the structure to form emitting aggregates, for example, of J‐type [4c] or X‐type [16] . Structural change, transforming the continuous H‐type dimeric stacking to discrete dimers, showing intense (54.8 %) excimer fluorescence with a maximum at 690 nm, seems also promising [17]…”