NPB-DPA

CAS Number 910058-11-6

Charge Transport Layer Materials, High Purity Sublimed Materials, Hole Injection Layer Materials, Hole Transport Layer Materials, Materials, OLED Materials, Semiconducting Molecules, TADF Materials

MSDS

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

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*	λ_max 355 nm in DCM
Fluorescence	λ_max 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

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.

Chemical Structure

npb-dpa, 910058-11-6 — Chemical structure of N,N'-Bis[4-(diphenylamino)phenyl]-N,N'-di(1-naphthyl)benzidine (NPB-DPA), CAS 910058-11-6

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

MSDS Documentation

NPB-DPA MSDS sheet

Literature 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.