Abstract
A series of highly extended π-conjugated ladder-type oligo(p-phenylene)s containing up to 10 phenyl rings with (L)-Ph(n)-NPh (n=7–10) or without diphenylamino endcaps (L)-Ph(n) (n=7 and 8) were synthesized and investigated for their multiphoton absorption properties for frequency upconverted blue ASE/lasing. Extremely large two-photon absorption (2PA) cross-sections and highly efficient 2PA ASE/lasing with ultralow threshold were achieved. (L)-Ph(10)-NPh exhibits the highest intrinsic 2PA cross-section of 3643 GM for a blue emissive organic fluorophore reported so far. The record-high 2PA pumped ASE/lasing efficiency of 2.06 % was obtained by un-endcapped oligomer, (L)-Ph(8) rather than that with larger σ2, suggesting that a molecule with larger σ2is not guaranteed to exhibit higher η2. All of these oligomers exhibit exceptionally ultralow 2PA pumped ASE/lasing thresholds, among which the lowest 2PA pumped threshold of circa 0.26 μJ was achieved by (L)-Ph(10)-NPh.
Original language | English |
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Pages (from-to) | 10639-10644 |
Number of pages | 6 |
Journal | Angewandte Chemie. International Edition |
Volume | 55 |
Issue number | 36 |
DOIs | |
Publication status | Published - 26 Aug 2016 |
Scopus Subject Areas
- Catalysis
- General Chemistry
User-Defined Keywords
- amplified spontaneous emission
- blue lasing
- ladder oligomers
- multiphoton absorption
- oligophenylenes