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.

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

General Information

CAS number	58328-31-7
Chemical formula	C36H24N2
Molecular weight	484.59 g/mol
HOMO/LUMO	HOMO 6.0 eV, LUMO 2.9 eV
Synonyms	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

Purity	> 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

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
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
Max EQE	17.5%
Max. Power Efficiency	28 lm W−1

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
EQE@100  cd/m2	23.4
Current Efficiency@100  cd/m2	81 cd/A
Powder Efficiency@100  cd/m2	78.0 lm W−1

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
Max. EQE	12.2%
Max. Current Efficiency	42.4 cd/A
Max. Power Efficiency	47.6 lm W−1

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
Max. EQE	16.78%
Max. Luminance	42,236 cd/m2
Max. Current Efficiency	50.2 cd/A
Max. Power Efficiency	12.9 lm W−1

Device structure	ITO/NPD* (40 nm)/9%-Ir(piq)3:CBP (20 nm)/BPhen (50 nm)/KF (1 nm)/Al [11]
Colour	Red
Max. Luminance	11,000 cd/m2
Max EQE	10.3%
Max. Powder Efficiency	8.0 lm W−1

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
Luminance@15 V	1,320 cd/m2
Power Efficiency@14 V	56.6 lm W−1
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
Luminance@ 10 mA/cm2	1,790 cd/m2
Power Efficiency@ 10 mA/cm2	4.65 lm W−1
Current Efficiency@ 10 mA/cm2	18.0 cd/A

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

Characterisations

Pricing

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

CBP MSDS sheet

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); http://dx.doi.org/10.1063/1.3532844.
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); http://dx.doi.org/10.1016/j.synthmet.2013.11.010.
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). http://dx.doi.org/10.1016/j.jlumin.2013.09.004.
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.

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To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.

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