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Product Code M391-1g
Price £115 ex. VAT

CBP, host material for efficient OLEDs

Low price and available for priority dispatch

Overview | Specifications | Pricing and Options | MSDS | Literature and Reviews

4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP), is one of the most widely-used host materials for efficient fluorescent and phosphorescent organic light-emitting diodes with high hole mobility. This is due to its electron-rich property from two carbazolyl units.

CBP, 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl from Ossila was used in the high-impact paper (IF 14.92)

CBP, 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl from Ossila was used in the high-impact paper (IF 14.92), Complete polarization of electronic spins in OLEDs, T. Scharff et al., Nat. Commun., 12, 2071 (2021); DOI: 10.1038/s41467-021-22191-3.

It has been demonstrated that CBP can efficiently host green, yellow and red phosphorescent emitters with triplet energies smaller than that of CBP (ET = 2.6 eV) [1].

General Information

CAS number 58328-31-7
Chemical formula C36H24N2
Molecular weight 484.59 g/mol
Synonyms CBP, 4,4′-Bis(9-carbazolyl)-1,1′-biphenyl, 4,4-N,N′-Dicarbazole-1,1′-biphenyl,DCBP, BSBCz, BSB-Cz
Classification / Family

Carbazole derivatives, Hole-injection layer materials, Hole transport layer materials, Hole blocking layer materials, Phosphorescent host materials, Light-emitting fiodes, Organic electronics, Sublimed materials

Product Details


> 99.5% (sublimed)

> 98.0% (unsublimed)

Melting point 281-285 (lit.) °C
Appearance White powder

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

Chemical Structure

CBP chemical structure
Chemical Structure of 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP)

Device Structure(s)

Device structure ITO/MoO3 (3 nm)/CBP: 20 wt% Ir(ppy)3: 4 wt% FIrpic (30 nm)/TAZ (50 nm) [8]
Colour Green green light emitting device
Max. Luminance 27,524 cd/m2
Max. Current Efficiency 71.2 cd/A
Device structure ITO /TAPC/(1wt% DPB:99wt% tri-PXZ-TRZ*):CBP (15:85)/LiF/Al [6]
Colour Red red light emitting device
Max EQE 17.5%
Max. Power Efficiency 28 lm W1
Device structure ITO/MO3 (1 nm)/CBP (35 nm)/8 wt% Ir(ppy)2(acac):CBP/TPBi (65 nm)/LiF/Al (100 nm) [7]
Colour Green green light emitting device
EQE at 100 cd/m2 23.4
Current Efficiency at 100


81 cd/A
Powder Efficiency at 100


78.0 lm W1
Device structure ITO/MoOx (2 nm)/m-MTDATA: MoOx (30 nm, 15 wt.%)/m-MTDATA (10 nm)/Ir(ppz)3(10 nm)/CBP:PO-01* (3 nm, 6 wt.%)/Ir(ppz)3 (1 nm)/DBFDPOPhCz*:FIrpic (10 nm,10 wt.%)/Bphen (36 nm)/LiF (1 nm)/Al [9]
Colour White white light emitting device
Max. EQE 12.2%
Max. Current Efficiency 42.4 cd/A
Max. Power Efficiency 47.6 lm W1
Device structure ITO/NPB (30 nm)/CBP:8 wt% (t-bt)2Ir(acac)* (15 nm)/BPhen(35 nm)/LiF (1 nm)/CoPc:C60 (4:1) (5 nm)/MoO3(5 nm)/NPB(30 nm)/CBP:8 wt% (t-bt)2Ir(acac)* (15 nm)/BPhen (35 nm)/Mg:Ag (100 nm) [10]
Colour Yellow yellow light emitting device
Max. EQE 16.78%
Max. Luminance 42,236 cd/m2
Max. Current Efficiency 50.2 cd/A
Max. Power Efficiency 12.9 lm W1
Device structure ITO/NPD* (40 nm)/9%-Ir(piq)3:CBP (20 nm)/BPhen (50 nm)/KF (1 nm)/Al [11]
Colour Red red light emitting device
Max. Luminance 11,000 cd/m2
Max EQE 10.3%
Max. Powder Efficiency 8.0 lm W1
Device structure ITO/0.4 wt% F4TCNQ doped α NPD (30 nm)/ 5 wt% Ir(ppy)3 doped CBP (50 nm)/BPhen (30 nm)/20 wt% TCNQ mixed BPhen (1.5 nm)/Al [12]
Colour Green green light emitting device
Luminance at 15 V 1,320 cd/m2
Power Efficiency at 14 V 56.6 lm W−1
Current Efficiency at 14 V 23.17 cd/A
Device structure ITO/F4TCNQ (3 nm)/MeO-Spiro-TPD (27 nm)/CBP + BCzVbi* (50 nm)/BPhen (10 nm)/TCNQ mixed BPhen (1.5 nm)/Al [13]
Colour Red red light emitting device
Luminance at 10 mA/cm2 1,790 cd/m2
Power Efficiency at 10 mA/cm2 4.65 lm W−1
Current Efficiency at 10 mA/cm2 18.0 cd/A

*For chemical structure information, please refer to the cited references.

When fabricating devices, processing and handling materials in a glove box helps maintain their purity and maintain efficiency by avoiding contamination from particulates, moisture, and airborne impurities.


1H NMR 4,4'-bis(n-carbazolyl)-1,1'-biphenyl CBP

1H NMR of 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP) in CDCl3.

HPLC trace of 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP)

HPLC trace of 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP).


Grade Order Code Quantity Price
Sublimed (>99.5% purity) M391 1 g £115
Unsublimed (>98.0% purity) M392 5 g £180
Sublimed (>99.5% purity) M391 5 g £480

MSDS Documentation


Literature and Reviews

  1. Transient analysis of organic electrophosphorescence: I. Transient analysis of triplet energy transfer, M. Baldo et al., Phys Rev B, 62: 10958–10966 (2000).
  2. Management of singlet and triplet excitons for efficient white organic light-emitting devices, Y. Sun, et al, Nature 440, 908-912 (2006), doi:10.1038/nature04645.
  3. Highly efficient single-layer dendrimer light-emitting diodes with balanced charge transport, T. D. Anthopoulos et al., Appl. Phys. Lett. 82, 4824 (2003).
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