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CAS: 19456-48-5
SKU: S2209
Poly(9.9-Di-N-octylfluorenyl-2,7diyl) | SKU: S2209
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Poly(9,9-Di-N-octylfluorenyl-2,7-diyl), or PFO, is a conjugated polyfluorene polymer known for its bright blue photoluminescence and electroluminescence. Its octyl side chains give it excellent solubility in solvents like chloroform, allowing it to be processed into thin, uniform films for device fabrication. Sarchem Labs supplies PFO at high molecular weight (Mw ≥ 20,000), supported by full documentation (COA, SDS) for research quality assurance. It is primarily used as a blue-emitting layer in OLED research and as a dispersing agent for single-walled carbon nanotubes in advanced electronics research.
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Specifications

Linear FormulaC8H9(C29H40)nC8H9
Physical FormSolid
SolubilitySoluble in chloroform
Fluorescence Backgroundλex 374 nm / λem 417 nm (in chloroform)

Applications

Emissive/active layer material in blue-light-emitting OLED and other electroluminescent device stacks
Model conjugated polymer for phase-separation studies using conducting-probe techniques
Dispersing agent for single-walled carbon nanotubes (SWCNTs) in solution
Precursor material for SWCNT-based field-effect transistor (FET) fabrication
Thin-film research in polymer-based optoelectronic device architectures

Product Description

Synonyms: Fluorenyl polymer

What is Poly(9,9-Di-N-octylfluorenyl-2,7-diyl)?

Poly(9,9-di-n-octylfluorenyl-2,7-diyl), commonly abbreviated PFO, is a conjugated polyfluorene backbone carrying two n-octyl side chains at the 9-position of each fluorene repeat unit. This alkyl substitution gives the polymer good solubility in common organic solvents such as chloroform, while the extended conjugated backbone is responsible for its characteristic blue photoluminescence and electroluminescence. As a polymeric material rather than a discrete small molecule, PFO is supplied with a molecular weight range (Mw ≥ 20,000) and a polydispersity index (Mw/Mn ~3.7) describing the natural spread of chain lengths produced during polymerization — which is also why Sigma Aldrich does not list an individual CAS number for it.

Optically, PFO absorbs strongly around 365 nm and, when excited near 374 nm in chloroform solution, emits fluorescence centered around 417 nm, placing its emission in the blue region of the visible spectrum.

Uses of Poly(9,9-Di-N-octylfluorenyl-2,7-diyl)

PFO is best known as an emissive layer material in organic light-emitting diode (OLED) research, where its blue electroluminescence and film-forming characteristics make it a useful component in multilayer device stacks. Its combination of electroluminescent efficiency and chemical stability has made it a frequently studied candidate polymer for exploring how layer composition and device architecture influence luminance and quantum efficiency.

Beyond electroluminescent devices, PFO also serves in materials-science research as a model system for studying phase-separated polymer films. Separately, PFO is employed as a dispersing agent for single-walled carbon nanotubes (SWCNTs) in solution; the resulting stable SWCNT dispersions are subsequently used to fabricate field-effect transistors (FETs).

Safety Information

  • GHS Classification: No GHS pictograms, signal word, or hazard statements were provided in the available reference data. Consult the current SDS for complete classification.
  • Storage Class: 11 – Combustible Solids. Store in a cool, dry area away from ignition sources and strong oxidizers.
  • Water Hazard Class (WGK): 3 — avoid release into drains, soil, or waterways.
  • PPE: Eye shields/safety glasses and chemical-resistant gloves; use a properly fitted N95 (US) respirator where dust generation is possible.
  • General Handling: Avoid generating or inhaling dust, work in a well-ventilated area, and handle chloroform solutions under a fume hood.

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FAQs: Poly(9.9-Di-N-octylfluorenyl-2,7diyl)

PFO is a high-molecular-weight polymer produced with a distribution of chain lengths rather than a single, fixed molecular structure, and Sigma Aldrich does not list an individual CAS number for it. It's characterized instead by parameters like molecular weight (Mw) and polydispersity (Mw/Mn).

The Mw value indicates the average molecular weight of the polymer chains, while Mw/Mn describes how broad or narrow that distribution is. Both matter for thin-film processing, since chain length and uniformity influence solution viscosity and film-forming behavior.

PFO's conjugated fluorene backbone has an intrinsic emission profile in the blue region, with fluorescence centered around 417 nm when excited at 374 nm — combined with reasonable electroluminescent efficiency and solution processability.

Chloroform is the only solvent for which solubility has been confirmed for this product. If you need an alternative solvent system, it's best to run a small-scale solubility and film-quality test first.

Since PFO is classified under Storage Class 11 and carries a WGK 3 water hazard rating, store it away from ignition sources and out of drains/waterways. Use eye protection, chemical-resistant gloves, and an N95-type respirator if dust generation is possible.