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

Product Code M391
Price £88.00 ex. VAT

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), 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
  • CBP, 4,4′-Bis(9-carbazolyl)-1,1′-biphenyl
  • 4,4-N,N′-Dicarbazole-1,1′-biphenyl
  • DCBP
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 for OLED devices 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
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
Max EQE 17.5%
Max. Power Efficiency 28lm 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
EQE@100  cd/m2 23.4
Current Efficiency@100 


81 cd/A
Powder Efficiency@100 


78.0 lm W1
Device structure ITO/MoOx (2 nm)/m-MTDATA: MoOx (30 nm, 15 wt.%)/m-MTDATA (10 nm)/Ir(ppz)(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
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)/MoO(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
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
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
Luminance@15 V 1,320 cd/m2 
Power Efficiency@14 V 56.6 lm W1  
Current Efficiency@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
Luminance@ 10 mA/cm2 1,790 cd/m2
Power Efficiency@ 10 mA/cm2      4.65 lm W1  
Current Efficiency@ 10 mA/cm2 18.0 cd/A

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


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 £88.00
Unsublimed (>98.0% purity) M392 5 g £137.00
Sublimed (>99.5% purity) M391 5 g £339.00

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).
  4. White organic light-emitting devices with a bipolar transport layer between blue fluorescent and orange phosphorescent emitting layers, P. Chen et al., Appl. Phys. Lett. 91, 023505 (2007).
  5. Highly Efficient and Low-Voltage Phosphorescent Organic Light-Emitting Diodes Using an Iridium Complex as the Host Material, T. Tsuzuki et al., Adv. Mater., 19, 276–280 (2007).
  6. High-efficiency organic light-emitting diodes with fluorescent emitters, H. Nakanotani et al., Nat. Commun., 5, 4016, DOI: 10.1038/ncomms5016.
  7. Highly simplified phosphorescent organic light emitting diode with >20% external quantum efficiency at >10,000 cd/m2, Z. B. Wang, Appl. Phys. Lett. 98, 073310 (2011);
  8. Simplified phosphorescent organic light-emitting devices using heavy doping with an Ir complex as an emitter, Y. Miao et al., RSC Adv., 5, 4261 (2015). DOI: 10.1039/c4ra13308k.
  9. Highly efficient and color-stable white organic light-emitting diode based on a novel blue phosphorescent host, Q. Wu et al., Syn. Metals 187, 160– 164 (2014);
  10. Effect of bulk and planar heterojunctions based charge generation layers on the performance of tandem organic light-emitting diodes, Z. Ma et al., Org. Electronics, 30, 136-142 (2016). doi:10.1016/j.orgel.2015.12.020
  11. Homoleptic Cyclometalated Iridium Complexes with Highly Efficient Red Phosphorescence and Application to Organic Light-Emitting Diode, A. Tsuboyama et al., J. Am. Chem. Soc., 125, 12971-12979 (2003). DOI: 10.1021/ja034732d.
  12. Novel organic electron injection layer for efficient and stable organic light emitting diodes, R. Grover et al., J. Luminescence, 146, 53–56 (2014).
  13. Light outcoupling efficiency enhancement in organic light emitting diodes using an organic scattering layer, R. Grover et al., Phys. Status Solidi RRL 8 (1), 81–85 (2014). DOI: 10.1002/pssr.201308133.

To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.

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