Controlling singlet-triplet splitting in carbazole-oxadiazole based bipolar phosphorescent host materials

Paul Kautny; Zhongbin Wu; Berthold Stöger; Antoine Tissot; Ernst Horkel; Jiangshan Chen; Dongge Ma; Hans Hagemann; Johannes Fröhlich; Daniel Lumpi

doi:10.1016/j.orgel.2014.11.027

Controlling singlet-triplet splitting in carbazole-oxadiazole based bipolar phosphorescent host materials

Paul Kautny, Zhongbin Wu, Berthold Stöger, Antoine Tissot, Ernst Horkel, Jiangshan Chen, Dongge Ma, Hans Hagemann, Johannes Fröhlich, Daniel Lumpi

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15 引用（Scopus）

摘要

A rational molecular design strategy for carbazole-oxadiazole based bipolar host materials was developed to improve the device efficiency of blue phosphorescent organic light-emitting diodes (PHOLED). Steric effects of strategically placed methyl groups led to an increase of triplet energies (o-2MPCzPOXD: 2.66 eV and o-3MPCzPOXD: 2.73 eV versus the initial host material o-PczPOXD: 2.62 eV) while less pronouncedly affecting singlet energies and, therefore, retaining low driving voltages, high power efficiencies and remarkably low efficiency roll-offs in PHOLEDs. The maximum quantum efficiencies (EQE) for blue devices (FIrpic) were significantly raised for o-2MPCzPOXD (13.6%) and o-3MPCzPOXD (11.5%) versus o-PCzPOXD (9.0%) although yielding comparable values for green devices (Ir(ppy)₃; 12.9% and 15.4% versus 13.2%). Supported by theoretical calculations a structure-property relationship was established from photo-physical properties, PHOLED performance measurements and structural characterization from single crystal data.

源语言	英语
页（从-至）	216-228
页数	13
期刊	Organic Electronics
卷	17
期	1
DOI	https://doi.org/10.1016/j.orgel.2014.11.027
出版状态	已出版 - 2015
已对外发布	是

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title = "Controlling singlet-triplet splitting in carbazole-oxadiazole based bipolar phosphorescent host materials",

abstract = "A rational molecular design strategy for carbazole-oxadiazole based bipolar host materials was developed to improve the device efficiency of blue phosphorescent organic light-emitting diodes (PHOLED). Steric effects of strategically placed methyl groups led to an increase of triplet energies (o-2MPCzPOXD: 2.66 eV and o-3MPCzPOXD: 2.73 eV versus the initial host material o-PczPOXD: 2.62 eV) while less pronouncedly affecting singlet energies and, therefore, retaining low driving voltages, high power efficiencies and remarkably low efficiency roll-offs in PHOLEDs. The maximum quantum efficiencies (EQE) for blue devices (FIrpic) were significantly raised for o-2MPCzPOXD (13.6%) and o-3MPCzPOXD (11.5%) versus o-PCzPOXD (9.0%) although yielding comparable values for green devices (Ir(ppy)3; 12.9% and 15.4% versus 13.2%). Supported by theoretical calculations a structure-property relationship was established from photo-physical properties, PHOLED performance measurements and structural characterization from single crystal data.",

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AU - Kautny, Paul

AU - Wu, Zhongbin

AU - Stöger, Berthold

AU - Tissot, Antoine

AU - Horkel, Ernst

AU - Chen, Jiangshan

AU - Ma, Dongge

AU - Hagemann, Hans

AU - Fröhlich, Johannes

AU - Lumpi, Daniel

PY - 2015

Y1 - 2015

N2 - A rational molecular design strategy for carbazole-oxadiazole based bipolar host materials was developed to improve the device efficiency of blue phosphorescent organic light-emitting diodes (PHOLED). Steric effects of strategically placed methyl groups led to an increase of triplet energies (o-2MPCzPOXD: 2.66 eV and o-3MPCzPOXD: 2.73 eV versus the initial host material o-PczPOXD: 2.62 eV) while less pronouncedly affecting singlet energies and, therefore, retaining low driving voltages, high power efficiencies and remarkably low efficiency roll-offs in PHOLEDs. The maximum quantum efficiencies (EQE) for blue devices (FIrpic) were significantly raised for o-2MPCzPOXD (13.6%) and o-3MPCzPOXD (11.5%) versus o-PCzPOXD (9.0%) although yielding comparable values for green devices (Ir(ppy)3; 12.9% and 15.4% versus 13.2%). Supported by theoretical calculations a structure-property relationship was established from photo-physical properties, PHOLED performance measurements and structural characterization from single crystal data.

AB - A rational molecular design strategy for carbazole-oxadiazole based bipolar host materials was developed to improve the device efficiency of blue phosphorescent organic light-emitting diodes (PHOLED). Steric effects of strategically placed methyl groups led to an increase of triplet energies (o-2MPCzPOXD: 2.66 eV and o-3MPCzPOXD: 2.73 eV versus the initial host material o-PczPOXD: 2.62 eV) while less pronouncedly affecting singlet energies and, therefore, retaining low driving voltages, high power efficiencies and remarkably low efficiency roll-offs in PHOLEDs. The maximum quantum efficiencies (EQE) for blue devices (FIrpic) were significantly raised for o-2MPCzPOXD (13.6%) and o-3MPCzPOXD (11.5%) versus o-PCzPOXD (9.0%) although yielding comparable values for green devices (Ir(ppy)3; 12.9% and 15.4% versus 13.2%). Supported by theoretical calculations a structure-property relationship was established from photo-physical properties, PHOLED performance measurements and structural characterization from single crystal data.

KW - High triplet energy

KW - Low efficiency roll-off

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KW - Sterically induced torsion

KW - Structure-property relationship

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Controlling singlet-triplet splitting in carbazole-oxadiazole based bipolar phosphorescent host materials

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