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All Semiconducting Molecules, Sublimed Materials, TADF Materials, Transport Layer Materials

Product Code M2185A1-500mg
Price $325 ex. VAT

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NPB-DPA, HIL material in OLED devices

Sublimed and unsublimed grades are available for 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
Fluorescence 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

npb-dpa chemical structure
Chemical structure of NPB-DPA

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 blue light emitting device
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 blue light emitting device
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 blue light emitting device
Max. Current Efficiency 7.91 cd/A
Max. EQE 4.76%

*For chemical structure information, please refer to the cited references


Grade (Purity) Order Code Quantity Price
Sublimed (>99%) M2185A1 500 mg £260
Sublimed (>99%) M2185A1 1 g £400
Sublimed (>99%) M2185A1 5 g £1300
Unsublimed* (>98%) M2185B1 5 g £520
Unsublimed* (>98%) M2185B1 100 g £5000
*For unsublimed grade orders, the lead time is 2-3 weeks. For orders larger than 100 g, please contact us.

MSDS Documentation


Literature and Reviews

  1. 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.
  2. 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. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, military, pharmaceuticals, cosmetics, food, or commercial applications.

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