N-([1,1′-Biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine

N-([1,1′-biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine (BCFN) is an electron-rich material, with the HOMO energy level of 5.3 eV, the LUMO energy level of 2.2 eV and high hole mobility of 5.43 × 10^-5 cm₂V^-1s^-1. As a result, it is used as a hole-transport and hole-injection material in organic light-emitting diodes. BCFN has shown its advantages in improving the hole mobility of polymer-based hole transport layer; lower driving voltage of device, better efficiency, and higher EQE due to exciplex formation by utilizing in EML; and better device lifetimes in the combination of Ir(piq)₂(acac) to act as an electron scavenger layer for an reported device.

BCFN is a good morphologically stable material with T_g of 125 °C and T_d of 375 °C.

With a ET of 2.58 eV, BCFN is also a very good charge transporting layer material due to its large band gap (Eg = 3.1 eV) 2 for green, red and white phosphorescent organic light-emitting diodes (PhOLEDs).

OLED Device Performance:
BCFN increase the hole transport mobility of PVK (pure PVK: 2.09×10^-9 V cm^-1 S^-1; 30% of BCFN in PVK: 9.86×10^-7 V cm^-1 S^-1; 50% of BCFN in PVK: 1.15×10^-5 V cm^-1 S^-1):
1. ITO/PEDOT:PSS (40 nm)/PVK:BCFN (3:7, 20 nm)/BCFN:PFO (x:1-x, 80 nm)/CsF (1.5 nm)/Al (120 nm)
Color: Blue


BCFN in combination of ET1 to act as EML in forming exciplex and improve device performance:
2. ITO/HIL/HTL/(ET1+P1) or (ET1+BCFN+P1(doped)/ETL/ LiF/Al
Color: red
Device emission area of 81cm², and at 1000 cd m^-2, the efficiency exceeds 200 lm/W and the EQE exceeds 50 %.
lifespan@95: from 71h to 133h

BCFN in combination with Ir(piq)₂(acac) as electron scavenger layer:
3. ITO/NDP series in BCFN (3wt.%, 10nm)/BCFN(160nm) or BCFN(130nm)+BCFN:Ir(piq)₂(acac)(2wt.%, 10nm)+BCFN(20)/ [Ir(TMSBppy)ppy₂]:BPTZBC (10 wt.%, 40nm))/ TPBi:Liq (1:1 wt. % ratio, 36nm)/ Liq (0.1nm)/Al (60 nm)
Color: yellow
Efficiencies are not affected.
lifespan@95: from 71h to 133h

N-([1,1′-Biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine can be used in different application areas as an emissive layer or hole transport layer due the presence of π-conjugated structure and electron-donating/accepting groups. It is suitable to be used in R&D studies such as organic field-effect transistors (OFETs), molecular electronics, sensors, organic photovoltaics (OPVs), and organic light-emitting diodes (OLEDs).