α-NPD

CAS Number 495416-60-9

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

MSDS

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

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 (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-NPD MSDS Sheet

Literature and Reviews

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.
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.
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.

Electro-Optic Properties of High-Efficiency Organic Electronics with the Addition of An Interlayer, S. Lee et al., Appl. Sci., 13, 624 (2023); DOI: 10.3390/app13010624.
White-light electroluminescence from a layer incorporating a single fully-organic spiro compound with phosphine oxide substituents, P Tourneur et al., J. Mater. Chem. C, 8, 14462-14468 (2020); DOI: 10.1039/d0tc03285a.
Influence of exciton lifetime on charge carrier dynamics in an organic heterostructure, K. Agrawal et al., Appl. Phys. Lett., 102, 113304 (2013); DOI: 10.1063/1.4795523.