Affiliation: | 1. Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore These authors contributed equally to this work.;2. Departamento Física Aplicada, and Instituto Universitario de Materiales de Alicante, Universidad de Alicante, 03080 Alicante, Spain These authors contributed equally to this work.;3. Department of Physical Chemistry, University of Malaga, Campus de Teations s/n, 229071 Malaga, Spain These authors contributed equally to this work.;4. Departamento Óptica, Farmacología y Anatomía, and Instituto Universitario de Materiales de Alicante, Universidad de Alicante, 03080 Alicante, Spain;5. Departamento Física Aplicada, and Instituto Universitario de Materiales de Alicante, Universidad de Alicante, 03080 Alicante, Spain;6. Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Singapore;7. Department of Physical Chemistry, University of Malaga, Campus de Teations s/n, 229071 Malaga, Spain |
Abstract: | Perylene-fused, aggregation-free polycyclic aromatic hydrocarbons with partial zigzag periphery ( ZY-01 , ZY-02 , and ZY-03 ) were synthesized. X-ray crystallographic analysis reveals that there is no intermolecular π–π stacking in any of the three molecules, and as a result, they show moderate-to-high photoluminescence quantum yield in both solution and in the solid state. They also display the characteristic absorption and emission spectra of perylene dyes. ZY-01 and ZY-02 with a nearly planar π-conjugated skeleton exhibit amplified spontaneous emission (ASE) when dispersed in polystyrene thin films. Solution-processed distributed feedback lasers have been fabricated using ZY-01 and ZY-02 as active gain materials, both showing narrow emission linewidth (<0.4 nm) at wavelengths around 515 and 570 nm, respectively. In contrast, ZY-03 did not show ASE and lasing, presumably due to its highly twisted backbone, which facilitates nonradiative internal conversion and intersystem crossing. |