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Aggregation induction of tetraphenylethylene AIEgen and its supramolecular aggregates toward light-emitting diodes.
- Source :
-
Journal of Solid State Chemistry . Feb2020, Vol. 282, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Aggregation behavior of luminophores is a subject of great interest over more than half a century. Aggregation generally causes quenching of luminescence of luminophores, which is detrimental for the solid state electroluminescence device fabrication. In oppose to the aggregation caused quenching, aggregation-induced emission phenomenon leads to highly luminescence state of luminophores upon aggregate formation. However, aggregation-induced emission behavior of the luminophores is commonly observed in irregular bulk solids, by adding antisolvents into a solution or in the biological cells, where the state of aggregation remains uncontrolled. Here we report on the synthesis of a new tailor made luminogen, 4′,4‴-(2,2-bis(4-methoxyphenyl)ethene-1,1-diyl)bis([1,1′-biphenyl]-4-carbaldehyde) (TPE 2) using Suzuki coupling reaction with high yield. We form the well-controlled supramolecular aggregates of TPE 2 at the air−water interface of a Langmuir trough. As a consequence, the mono- and multilayer Langmuir−Blodgett films of TPE 2 show a large enhancement of luminescence in comparison to the solution phase owing to the aggregation-induced emission phenomenon. We reveal inherent interaction of TPE 2 complexes within the supramolecular aggregates using density functional theory. This unique feature of luminescence enhancement is utilized for the fabrication of light-emitting diodes with low threshold voltage using TPE 2 as active layer. This study opens up the advantage of ordered supramolecular assembly to achieve optimal luminescence performances. A new tailor made AIE luminogen, TPE 2 , form well-controlled supramolecular spherical aggregates at the air−water interface of a Langmuir trough. Fabrication of light emitting diodes using supramolecular aggregates as active layer is demonstrated. Image 1 • Supramolecular aggregates at the air-water interface. • Langmuir-Blodgett organized assembly. • Aggregation induced emission. • Light emitting diode fabrication. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00224596
- Volume :
- 282
- Database :
- Academic Search Index
- Journal :
- Journal of Solid State Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 141239529
- Full Text :
- https://doi.org/10.1016/j.jssc.2019.121122