Efficient and low potential operative host/guest concentration graded bilayer polymer electrophosphorescence devices

Jung Kyu Kim; Dong Hyun Lee; Dong Hwan Wang; Sung M. Cho; Jun Young Lee; Jong Hyeok Park

doi:10.1016/j.jlumin.2011.09.048

Efficient and low potential operative host/guest concentration graded bilayer polymer electrophosphorescence devices

Jung Kyu Kim, Dong Hyun Lee, Dong Hwan Wang, Sung M. Cho, Jun Young Lee, Jong Hyeok Park

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article

2 Citations (Scopus)

Abstract

This study investigates enhanced electrophosphorescence and its mechanism in poly(N-vinyl carbazole) (PVK): N,N′-diphenyl-N,N′-bis(3- methylphenyl)-[1,1-biphenyl]-4,4′-diamine (TPD)/2-(4-biphenylyl)-5-(4- tert-butylphenyl)-1,3,4-oxadiazole (PBD): fac-tris(2-phenylpyridine)iridium [Ir(ppy) ₃] concentration graded bilayer electroluminescence devices. The two layers are partially intermixed at the bilayer interface because the upper layer (composed of Ir(ppy) ₃ and PBD) was spun cast from a solvent that slightly swells the bottom layer (composed of PVK and TPD). Moreover, PBD in the upper layer can act as an efficient electron transport layer as well as a hole blocking layer, resulting in greatly enhanced electronhole recombination. An indium tin oxide (ITO)/3,4- polyethylenedioxythiophenepolystyrenesulfonate (PEDOT)/[PVK:TPD/Ir(ppy) ₃:PBD] bilayer/LiF/Al device showed dramatically decreased turn-on and driving voltages, enhanced luminescence efficiency, and narrower emission spectra compared to those of conventional ITO/PEDOT:PSS/[PVK:TPD:Ir(ppy) ₃:PBD] blend/LiF/Al devices.

Original language	English
Pages (from-to)	870-874
Number of pages	5
Journal	Journal of Luminescence
Volume	132
Issue number	3
DOIs	https://doi.org/10.1016/j.jlumin.2011.09.048
Publication status	Published - 2012 Mar

All Science Journal Classification (ASJC) codes

Biophysics
Atomic and Molecular Physics, and Optics
Chemistry(all)
Biochemistry
Condensed Matter Physics

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@article{3a7545da6a0346a4aae2f02a909623ab,

title = "Efficient and low potential operative host/guest concentration graded bilayer polymer electrophosphorescence devices",

abstract = "This study investigates enhanced electrophosphorescence and its mechanism in poly(N-vinyl carbazole) (PVK): N,N′-diphenyl-N,N′-bis(3- methylphenyl)-[1,1-biphenyl]-4,4′-diamine (TPD)/2-(4-biphenylyl)-5-(4- tert-butylphenyl)-1,3,4-oxadiazole (PBD): fac-tris(2-phenylpyridine)iridium [Ir(ppy) 3] concentration graded bilayer electroluminescence devices. The two layers are partially intermixed at the bilayer interface because the upper layer (composed of Ir(ppy) 3 and PBD) was spun cast from a solvent that slightly swells the bottom layer (composed of PVK and TPD). Moreover, PBD in the upper layer can act as an efficient electron transport layer as well as a hole blocking layer, resulting in greatly enhanced electronhole recombination. An indium tin oxide (ITO)/3,4- polyethylenedioxythiophenepolystyrenesulfonate (PEDOT)/[PVK:TPD/Ir(ppy) 3:PBD] bilayer/LiF/Al device showed dramatically decreased turn-on and driving voltages, enhanced luminescence efficiency, and narrower emission spectra compared to those of conventional ITO/PEDOT:PSS/[PVK:TPD:Ir(ppy) 3:PBD] blend/LiF/Al devices.",

author = "Kim, {Jung Kyu} and Lee, {Dong Hyun} and Wang, {Dong Hwan} and Cho, {Sung M.} and Lee, {Jun Young} and Park, {Jong Hyeok}",

year = "2012",

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T1 - Efficient and low potential operative host/guest concentration graded bilayer polymer electrophosphorescence devices

AU - Kim, Jung Kyu

AU - Lee, Dong Hyun

AU - Wang, Dong Hwan

AU - Cho, Sung M.

AU - Lee, Jun Young

AU - Park, Jong Hyeok

PY - 2012/3

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N2 - This study investigates enhanced electrophosphorescence and its mechanism in poly(N-vinyl carbazole) (PVK): N,N′-diphenyl-N,N′-bis(3- methylphenyl)-[1,1-biphenyl]-4,4′-diamine (TPD)/2-(4-biphenylyl)-5-(4- tert-butylphenyl)-1,3,4-oxadiazole (PBD): fac-tris(2-phenylpyridine)iridium [Ir(ppy) 3] concentration graded bilayer electroluminescence devices. The two layers are partially intermixed at the bilayer interface because the upper layer (composed of Ir(ppy) 3 and PBD) was spun cast from a solvent that slightly swells the bottom layer (composed of PVK and TPD). Moreover, PBD in the upper layer can act as an efficient electron transport layer as well as a hole blocking layer, resulting in greatly enhanced electronhole recombination. An indium tin oxide (ITO)/3,4- polyethylenedioxythiophenepolystyrenesulfonate (PEDOT)/[PVK:TPD/Ir(ppy) 3:PBD] bilayer/LiF/Al device showed dramatically decreased turn-on and driving voltages, enhanced luminescence efficiency, and narrower emission spectra compared to those of conventional ITO/PEDOT:PSS/[PVK:TPD:Ir(ppy) 3:PBD] blend/LiF/Al devices.

AB - This study investigates enhanced electrophosphorescence and its mechanism in poly(N-vinyl carbazole) (PVK): N,N′-diphenyl-N,N′-bis(3- methylphenyl)-[1,1-biphenyl]-4,4′-diamine (TPD)/2-(4-biphenylyl)-5-(4- tert-butylphenyl)-1,3,4-oxadiazole (PBD): fac-tris(2-phenylpyridine)iridium [Ir(ppy) 3] concentration graded bilayer electroluminescence devices. The two layers are partially intermixed at the bilayer interface because the upper layer (composed of Ir(ppy) 3 and PBD) was spun cast from a solvent that slightly swells the bottom layer (composed of PVK and TPD). Moreover, PBD in the upper layer can act as an efficient electron transport layer as well as a hole blocking layer, resulting in greatly enhanced electronhole recombination. An indium tin oxide (ITO)/3,4- polyethylenedioxythiophenepolystyrenesulfonate (PEDOT)/[PVK:TPD/Ir(ppy) 3:PBD] bilayer/LiF/Al device showed dramatically decreased turn-on and driving voltages, enhanced luminescence efficiency, and narrower emission spectra compared to those of conventional ITO/PEDOT:PSS/[PVK:TPD:Ir(ppy) 3:PBD] blend/LiF/Al devices.

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