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Product Code M2388A1-LT-100mg
Price £330 ex. VAT

Px-VPN, TADF green dopant material

Available in sublimed grade for highly efficient TADF-OLED devices

Px-VPN (CAS number 1784766-39-7), namely 4,5-bis[4-(N-phenoxazine)phenyl]phthalonitrile, has a similar structure to 2CzPN with two electron-withdrawing nitrile groups at 1,2-positions and two electron-donating N-phenylphenoxazine groups 4,5-positions of the benzene ring. The phenyl groups separating the electron-donating phenoxazine and electron-withdrawing phthalonitrile are acting as π bridges to the structure of A-π-D. Phenoxazines are stronger electron donating than carbazoles, Px-VPN is a TADF green emitter (λmax PL = 540 nm) while Cz-VPN is blue (λmax PL = 450 nm).

With a smaller ΔEST, the delayed emission lifetime of the green-emitting Px-VPN film found to be much shorter than those of the blue-emitting Cz-VPN, suggesting a more efficient T1 to S1 up-conversion. TADF green light-emitting device based on Px-VPN as the dopant and mCP as the host achieved a high EQE of 14.9%.

General Information

CAS Number 1784766-39-7
Chemical Formula C44H26N4O2
Molecular Weight 624.7 g/mol
Absorption λmax 304 nm, 406 nm in toluene [1]
Fluorescence λmax 577 nm in toluene [1]
HOMO/LUMO HOMO = 5.70 eV, LUMO = 3.30 eV [1]
Full Name 4,4''-Di-10H-phenoxazin-10-yl[1,1':2',1''-terphenyl]-4',5'-dicarbonitrile
Synonyms 4,5-Bis[4-(N-phenoxazine)phenyl]phthalonitrile
Classification / Family Phenoxazine derivatives, TADF green dopant, TADF Host, Sublimed materials

Chemical Structure

px-vpn chemical structure, 1784766-39-7, 4,4''-Di-10H-phenoxazin-10-yl[1,1':2',1''-terphenyl]-4',5'-dicarbonitrile
Chemical Structure of 4,4''-Di-10H-phenoxazin-10-yl[1,1':2',1''-terphenyl]-4',5'-dicarbonitrile (Px-VPN), CAS 1784766-39-7

Product Details

Purity Sublimed* >99.0% (HPLC)
Melting Point N/A
Appearance Orange powder/crystals

*Sublimation is a technique used to obtain ultra-pure grade chemicals. For more details about sublimation, please refer to the Sublimed Materials.

Device Structure

Device Structure ITO (110 nm)/NPD (40 nm)/mCP (10 nm)/Px-VPN:mCP (6wt%, 20 nm)/PPF (10 nm)/TPBi (30 nm)/LiF (0.8 nm)/Al (100 nm) [1]
Colour green light emitting device Green
Max. EQE 14.9%
Max. Current Efficiency 45.4 cd/A
Max. Power Efficiency 26.7 Im/W

MSDS Documentation



Grade Order Code Quantity Price
Sublimed (>99.0% purity) M2388A1 100 mg £330
Sublimed (>99.0% purity) M2388A1 250 mg £660
Sublimed (>99.0% purity) M2388A1 500 mg £1150
Sublimed (>99.0% purity) M2388A1 1 g £1900

Literature and Reviews

  1. Full-Color Delayed Fluorescence Materials Based on Wedge-Shaped Phthalonitriles and Dicyanopyrazines: Systematic Design, Tunable Photophysical Properties, and OLED Performance, I. Park et al., Adv. Funct. Mater., 26, 1813−1821 (2016); 10.1002/adfm.201505106.
  2. All-organic thermally activated delayed fluorescence materials for organic light-emitting diodes, Y. Liu et al., Nat Rev. Mater., 3, 18020 (2018); DOI: 10.1038/natrevmats.2018.20.
  3. Molecular Design Strategy of Organic Thermally Activated Delayed Fluorescence Emitters, Y. Im et al., Chem. Mater., 29 (5), 1946–1963 (2017); DOI: 10.1021/acs.chemmater.6b05324.
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