p-bPPhenB

CAS Number 2135536-38-6

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

MSDS

Phenanthroline Based Electron Transport Layer (ETL)

High purity ETL / HBL material, sublimed ≥99%

Specifications | MSDS | Literature and Reviews

p-bPPhenB is a phenanthroline based electron transport layer materials for organic light-emitting diodes (OLEDs). p-bPPhenB exhibits very high electron mobility of 5.8 × 10⁻³ cm² V⁻¹ s⁻¹, an order higher than that of Bphen (5.5 × 10⁻⁴ cm² V⁻¹ s⁻¹), creating a very small injection barrier at the p−n junction interface. Single-stack red phosphorescent OLED (PhOLED) with p-bPPhenB as the electron transport layer demonstrates a low driving voltage of 2.7 V and a significantly improved maximum power efficiency of 56.8 lm W⁻¹, an external quantum efficiency of 30.8% with a device lifetime of LT₉₅ = 130 h.

Sandwich structured semi-transparent cathode fabricated by inserting a thin silver (Ag) layer between two layers of p-bPPhenB which acts as both wetting inducer and capping layer, shows excellent optical and electrical properties with high transmittance of 83.8% and low absorbance of 7.65% at 550 nm, and low sheet resistance of 2.1 Ω/sq. p-bPPhenB stabilizes of surface properties of the thin Ag film by forming coordination bond between the Ag atoms and nitrogen atoms of p-bPPhenB through donating unshared electrons to the Ag atom. Optimized phosphorescent green top-emission OLED with this pure Ag cathode configuration enables a low driving voltage of 5.0 V at 10 mA cm^-2 and high maximum current efficiency of about 167 cd/A.

Also, p-bPPhenB can also work with HATCN to fabricate a sandwich structure of Ag semi-transparent cathode: p-bPPhenB (40 nm)/Ag (12 nm)/HATCN (40 nm).

General Information

CAS Number	2135536-38-6
Chemical Formula	C₄₂H₂₆N₄
Molecular Weight	586.68 g/mol
Absorption	λ_max 275 nm (in 2-MeTHF)
Photoluminescence	λ_em 390 nm (in 2-MeTHF)
HOMO/LUMO	HOMO = - 6.22 eV, LUMO = - 2.88 eV
Synonyms	1,4-Bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene
Classification or Family	Phenanthroline derivative, Sublimed materials, Electron transport layer (ETL), Hole blocking layer (HBL), OLEDs

Product Details

Purity	Sublimed ≥99%
Melting point	T_g = 123.9 °C, T_m = 395.3 °C, T_d = 442.6 °C (5% weight loss)
Appearance	Pale brown to beige powder/crystals

Chemical Structure

Device Structure(s)

Device Structure	ITO (50 nm)/HATCN(7 nm)/NPB (50 nm)/PCZAC (10 nm)/mCBP-CN: DDBFT : 30 wt% DBA-DI (25 nm)/DDBFT (5 nm)/p-bPPhenB (30 nm)/LiF (1.5 nm)/Al (100 nm) [2]
Color	Blue light emission
CIE Coordinates	(0.15, 0.17)
V_ON	3.11 V
Max EQE	26.4%
Max. Luminance	107,500 cd m⁻²
LT₅₀	13,830 h

MSDS Documentation

p-bPPhenB MSDS Sheet

Literature and Reviews

G. Kim et al. (2017); Diphenanthroline Electron Transport Materials for the Efficient Charge Generation Unit in Tandem Organic Light-Emitting Diodes, Chem. Mater., 29, 8299−8312; DOI: 10.1021/acs.chemmater.7b02655.
D. Ahn et al. (2020); Rigid Oxygen-Bridged Boron-Based Blue Thermally Activated Delayed Fluorescence Emitter for Organic Light-Emitting Diode: Approach towards Satisfying High Efficiency and Long Lifetime Together, Adv. Opt. Mater., 8 (11), 2000102; DOI: 10.1002/adom.202000102.
H. Bae et al. (2019); Thermally Evaporated Organic/Ag/Organic Multilayer Transparent Conducting Electrode for Flexible Organic Light-Emitting Diodes, Adv. Electron. Mater., 5 (10), 1900620 (2019); DOI: 10.1002/aelm.201900620.

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