Px-VPN

CAS Number 1784766-39-7

MSDS

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 (λ_max PL = 540 nm) while Cz-VPN is blue (λ_max 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	λ_max 304 nm, 406 nm in toluene [1]
Fluorescence	λ_max 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

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
Max. EQE	14.9%
Max. Current Efficiency	45.4 cd/A
Max. Power Efficiency	26.7 Im/W

MSDS Documentation

Px-VPN MSDS sheet

Pricing

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

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.
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.
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.

Recent advancements of high efficient donor–acceptor type blue small molecule applied for OLEDs, Y. Li et al., Mater. Today, 20 (5), 258-266 (2017); DOI: 10.1016/j.mattod.2016.12.003.
Small-Molecule Emitters with High Quantum Efficiency: Mechanisms, Structures, and Applications in OLED Devices, Q. Wei et al., Adv. Optical Mater., 1800512 (2018); DOI: 10.1002/adom.201800512.