NPB-DPA, HIL material in OLED devices

Sublimed and unsublimed grades are available for NPB-DPA, N,N'-Bis[4-(diphenylamino)phenyl]-N,N'-di(1-naphthyl)benzidine, CAS No. 910058-11-6, Sublimed ≥99.0%, Unsublimed ≥98.0%

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

* Measurable with an optical spectrometer

Product Details

* Sublimation is a technique used to obtain ultra pure-grade chemicals, see sublimed materials.

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%