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

CBP, host material for efficient OLEDs

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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 (E_T = 2.6 eV) [1].

General Information

Product Details

*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

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.

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.

Characterisations

Pricing

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).