FREE shipping to on qualifying orders when you spend or more, processed by Ossila BV. All prices ex. VAT. Qualifying orders ship free worldwide! Fast, secure, and backed by the Ossila guarantee. It looks like you are visiting from , click to shop in or change country. Orders to the EU are processed by our EU office.
Join the Team About Ossila Contact Us | How to Order Shipping |Log In Create Account| Worldwide, $ USD   Flag

It looks like you are using an unsupported browser. You can still place orders by emailing us on info@ossila.com, but you may experience issues browsing our website. Please consider upgrading to a modern browser for better security and an improved browsing experience.

α-NPD CAS 495416-60-9
Product Code M2411A1-250mg
Price $365 ex. VAT
$ USD

How to Order | Shipping

A frequent electron rich 2,2′-dimethylbenzidine derivative

A hole transport and injection materials for OLEDs and OPVs

α-NPD (CAS number 495416-60-9), namely N,N′-Bis(naphthalen-1-yl)-N,N′-bis(phenyl)-2,2′-dimethylbenzidine, is a bis(triarylamine) that is joined by a 2,2'-dimethylbiphenyl unit. The only difference to NPB (N,N′-Bis(naphthalen-1-yl)-N,N′-bis(phenyl)benzidine) is that α-NPD has two extra methyl groups on the biphenyl bridging unit.

Bearing two triarylamine units, α-NPD is electron rich and known as a typical hole transporting material for organic electronics (OLEDs, OPVs). It is believed that the introduction of methyl groups in meta position on the central biphenyl unit of α-NPD is to create the distortion of the molecular geometry and consequently a decrease of the electronic conjugation as well as an increase of the band gap.

It is worth noting that α-NPD has also been identified as N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl)benzidine in a lot of literatures. Please check the chemical structure, CAS (chemical abstract service) number and chemical name before you place the order with us.

General Information

CAS Number 495416-60-9
Full Name N,N'-Bis(naphthalen-1-yl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine
Synonyms 2,2′-Dimethyl-N,N′-di-[(1-naphthyl)-N,N′-diphenyl]-1,1′-biphenyl-4,4′-diamine, α-NPD
Chemical Formula C46H36N2
Molecular Weight 616.79 g/mol
HOMO/LUMO HOMO = ~5.4 eV, LUMO = ~2.4 eV
Classification / Family Triarylamine derivatives, Hole transport materials, Sublimed materials

Product Details

Purity Sublimed >99.0% (HPLC)
Melting Point >310 °C (0.5% weight loss)
Appearance White to off-white powder/crystals

Chemical Structure

α-NPD, 495416-60-9, N,N'-Bis(naphthalen-1-yl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine chemical structure
Chemical Structure of N,N'-Bis(naphthalen-1-yl)-N,N'-bis(phenyl)-2,2'-dimethylbenzidine (α-NPD), CAS 495416-60-9

Device Structures

Device structure ITO/HAT-CN (5 nm)/TAPC (30 nm)/mCP (15 nm)/1.0 wt% TXOPhCz4:o,o'-NPh2 (20 nm)/TmPyPB (50 nm)/LiF (0.9 nm)/Al (90 nm) [1]
Colour white light emitting device White (0.38, 0.40)
Max. Current Efficiency 30.2 cd/A
Max. EQE 12.5%
Max. Power Efficiency 27.1 lm W-1

MSDS Documentation

α-NPDα-NPD MSDS Sheet

Literature and Reviews

  1. Highly efficient white light-emitting diodes with a bi-component emitting layer based on blue and yellow thermally activated delayed fluorescence emitters, J. Mater. Chem. C, 6, 2951 (2018); DOI: 10.1039/c8tc00594j.
  2. Resolving the Spatial Variation and Correlation of Hyperfine Spin Properties in Organic Light-Emitting Diodes, W. Pappas et al., Adv. Mater., 34 (11), 2104186 (2022); DOI: 10.1002/adma.202104186.
  3. Nonradiative Recombination via Charge-Transfer-Exciton to Polaron Energy Transfer Limits Photocurrent in Organic Solar Cells, S. Khan et al., Adv. Energy, Mater., 12 (19), 2200551 (2022); DOI: 10.1002/aenm.202200551.
Return to the top