Fluorescence lifetime, dipole orientation and bilayer polymer films

Xuan Long Ho, Po Jui Chen, Wei Yen Woon, Jonathon David White

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Bilayer films consisting of the optically transparent polymers, polystyrene (PS) and poly(methyl methacrylate) (PMMA) were spin-cast on glass substrates. The upper 13.5 nm layer (PS) was lightly doped with Rhodamine-6 G (RH6G) or MEH-PPV. While the fluorescence of MEH-PPV was independent of PMMA thickness, the lifetime of RH6G increased 3-fold as the underlying PMMA thickness increased from 0 to 500 nm while the collected flux decreased suggesting a reorientation of the smaller molecule's dipole with respect to the air-polymer interface with PMMA thickness. This suggests lifetime may find application for nondestructive thickness measurements of transparent films with sub-micron lateral resolution and large range.

Original languageEnglish
Pages (from-to)212-217
Number of pages6
JournalChemical Physics Letters
StatePublished - 2017


  • Bilayer films
  • Dipole orientation
  • Fluorescence lifetime
  • PMMA
  • Polystyrene
  • Thin films


Dive into the research topics of 'Fluorescence lifetime, dipole orientation and bilayer polymer films'. Together they form a unique fingerprint.

Cite this