Highly Efficient Multiphoton-Pumped Frequency-Upconversion Stimulated Blue Emission with Ultralow Threshold from Highly Extended Ladder-Type Oligo(p-phenylene)s

Lei Guo, King Fai Li, Xiaoqin Zhang, Kok Wai CHEAH*, Ricky M S WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

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 languageEnglish
Pages (from-to)10639-10644
Number of pages6
JournalAngewandte Chemie. International Edition
Volume55
Issue number36
DOIs
Publication statusPublished - 26 Aug 2016

Scopus Subject Areas

  • Catalysis
  • Chemistry(all)

User-Defined Keywords

  • amplified spontaneous emission
  • blue lasing
  • ladder oligomers
  • multiphoton absorption
  • oligophenylenes

Fingerprint

Dive into the research topics of 'Highly Efficient Multiphoton-Pumped Frequency-Upconversion Stimulated Blue Emission with Ultralow Threshold from Highly Extended Ladder-Type Oligo(p-phenylene)s'. Together they form a unique fingerprint.

Cite this