NPB-DPA
NPB-DPA, full name N,N'-Bis[4-(diphenylamino)phenyl]-N,N'-di(1-naphthyl)benzidine, is a derivative of triarylamines. It has a skeleton of two joined triarylamines with two diphenylamine as pending units. It is electron-rich and commonly used as a hole-injection layer (HIL) material in OLED devices.
NPB is normally used as a hole-transporting layer (HTL) material. In comparison, NPB-DPA is inserted between an ITO anode and a HTL to effectively modify the cathode surface and facilitate the collection of the holes to the electrode.
Like NPB-DPA, NPB's sister compound NPNPB is also commonly used as the buffer layer between a HTL and an anode to lower the barrier of the hole injections.
General Information
| CAS number | 910058-11-6 |
| Full name | N,N'-Bis[4-(diphenylamino)phenyl]-N,N'-di(1-naphthyl)benzidine, N,N’-Bis[4-(diphenylamino)phenyl]-N,N’-di-1-naphthalenyl-[1,1′-biphenyl]-4,4′-diamine |
| Chemical formula | C68H50N4 |
| Molecular weight | 923.18 g/mol |
| Absorption* | λmax 355 nm in DCM |
| Fluorescene | λmax 515 nm in DCM |
| HOMO/LUMO | HOMO = 5.2 eV, LUMO = 1.9 eV [1] |
| Classification / Family | Triarylamines, Hole-transport layer (HTL) materials, Hole-injection layer (HIL) materials, Electron-blocking layer materials, OLED materials, Sublimed materials, Organic electronics. |
* Measurable with an optical spectrometer, see our spectrometer application notes.
Product Details
| Purity | Sublimed* >99% (HPLC); Unsublimed >98% |
| Melting point | n/a |
| Appearance | Off-white crystal/powder |
* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials for OLED devices.
Chemical Structure
Device Structure(s)
| Device structure | ITO/NPB-DPA (60 nm)/TBB (30 nm)/NA-MSBAF*:DSA-Ph (30 nm, 5%)/LG201* (20 nm)/LiF/Al [1] |
| Colour | Sky-blue 
|
| Max. Luminance | 11,080 cd/m2 |
| Max. Current Efficiency | 7.67 cd/A |
| Max. EQE | 5.15% |
| Device structure | ITO/NPB-DPA (60 nm)/TBB (30 nm)/NA-SBAF*:DSA-Ph (30 nm, 5%)/LG201* (20 nm)/LiF/Al [1] |
| Colour | Sky-blue
|
| Max. Luminance | 13,020 cd/m2 |
| Max. Current Efficiency | 7.73 cd/A |
| Max. EQE | 4.93% |
| Device structure | ITO/NPB-DPA (60 nm)/TBB (30 nm)/NSBTF*:DSA-Ph (30 nm, 5%)/LG201* (20 nm)/LiF/Al [1] |
| Colour | Sky-blue
|
| Max. Current Efficiency | 7.91 cd/A |
| Max. EQE | 4.76% |
*For chemical structure information, please refer to the cited references
Pricing
| Grade (Purity) |
Order Code | Quantity | Price |
| Sublimed (>99%) | M2185A1 | 500 mg | £199.00 |
| Sublimed (>99%) | M2185A1 | 1 g | £299.00 |
| Sublimed (>99%) | M2185A1 | 5 g | £1010.00 |
| Unsublimed* (>98%) | M2185B1 | 5 g | £401.00 |
| Unsublimed* (>98%) | M2185B1 | 100 g | £3870.00 |
MSDS Documentation
NPB-DPA MSDS sheetLiterature and Reviews
- New spirobenzoanthracene derivatives with naphthylanthracene core: Synthesis and application in sky-blue fluorescent host materials, M. Kim et al., Dyes and Pigments 105, 202-207 (2014); doi: 10.1016/j.dyepig.2014.02.005.
- New spiro[benzotetraphene-fluorene] Derivatives: Synthesis and Application in Sky-Blue Fluorescent Host Materials, J. Cha et al., J. Fluoresc., 24, 1215–1224 (2014); DOI: 10.1007/s10895-014-1403-2.
To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.