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- Title
Highly Efficient Multiphoton-Pumped Frequency-Upconversion Stimulated Blue Emission with Ultralow Threshold from Highly Extended Ladder-Type Oligo( p-phenylene)s.
- Authors
Guo, Lei; Li, King Fai; Zhang, Xiaoqin; Cheah, Kok Wai; Wong, Man Shing
- 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 σ2 is 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.
- Subjects
LIGHT absorption; CONJUGATED oligomers; PHENYL group; CHEMICAL reactions; CHEMICAL processes
- Publication
Angewandte Chemie International Edition, 2016, Vol 55, Issue 36, p10639
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201604064