Near-Infrared Electroluminescence beyond 800â
nm with High Efficiency and Radiance from Anthracene Cored Emitters.
Angew Chem Int Ed Engl
; 59(48): 21578-21584, 2020 Nov 23.
Article
em En
| MEDLINE
| ID: mdl-32767734
ABSTRACT
Derivatives based on anthryleno[1,2-b]pyrazine-2,3-dicarbonitrile (DCPA) are used as luminescent materials, to realize near-infrared (NIR) electroluminescence. By functionalizing DCPA with aromatic amine donors, two emitters named DCPA-TPA and DCPA-BBPA are designed and synthesized. Both molecules have large dipole moments owing to the strong intramolecular charge transfer interactions between the amine donors and the DCPA acceptor. Thus, compared with doped films, the emission of neat films of DCPA-TPA and DCPA-BBPA can fully fall into the NIR region (>700â
nm) with increasing surrounding polarity by increasing doping ratio. Moreover, the non-doped devices based on DCPA-TPA and DCPA-BBPA provide NIR emission with peaks at 838 and 916â
nm, respectively. A maximum radiance of 20707â
mW Sr-1 m-2 was realized for the further optimized device based on DCPA-TPA. This work provides a simple and efficient strategy of molecular design for developing NIR emitting materials.
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2020
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Article