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The effect of energy level offset between Ir dopant and carbazole hosts on the emission efficiency
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FIG. 1.

UPS spectra as a function of the organic layer thickness on the Au substrate. (a) and (b) Au/mCP/FIr6. Insets: the optimized molecular structures and their -axis dipole moments were calculated using method on the platform of GAUSSIAN 03 software.

Image of FIG. 2.

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FIG. 2.

Schematics of the energy level alignment diagrams at the interfaces (a) Au/mCP/FIr6 and (b) that were obtained from the UPS experiments.

Image of FIG. 3.

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FIG. 3.

Maximum current efficiency as a function of the doping concentrations of FIr6 with a device structure of ITO/NPB(50)/TAPC(15)/host(5)/host: FIr6 (30)/3TPYMB(35)/LiF(1)/Al(60 nm), where the host is UGH2, , or mCP. Insets: energy level schemes of the devices that were used.

Image of FIG. 4.

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FIG. 4.

Voltage-current density curves and EQE-current density curves of the devices with structures of ITO/TAPC(50)/host(5)/host: FIr6 (30)/SiTAZ(35)/LiF(1)/Al(60 nm), where the host is or mCP.

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/content/aip/journal/apl/97/2/10.1063/1.3462931
2010-07-14
2014-04-24

Abstract

The interface energy offsets of various carbazole hosts and iridium(III) [bis(4,6-difluorophenyl) pyridinato-]-tetrakis(1-pyrazolyl)borate (FIr6) and their influence on the efficiency were investigated. Vacuum level shifted by for bis(4-(-carbazolyl)phenyl)dimethylsilane and FIr6 interface, which was negligible for other hosts and FIr6 interface. As a result, the hole injection from the host to the guest was almost barrier free to reach a high efficiency of 17.1% in the based device. It dropped to 14% when , -dicarbazolyl-3,5-benzene (mCP) was used as the host, which is the reminiscent of the existence of a hole injection barrier (−0.16 eV).

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Scitation: The effect of energy level offset between Ir dopant and carbazole hosts on the emission efficiency
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/2/10.1063/1.3462931
10.1063/1.3462931
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