Enhancement of quantum efficiency of organic light emitting devices by doping magnetic nanoparticles

Cheng Jun Sun; Yue Wu; Zhihua Xu; Bin Hu; Jianmin Bai; Jian Ping Wang; Jian Shen

doi:10.1063/1.2746415

Enhancement of quantum efficiency of organic light emitting devices by doping magnetic nanoparticles

Cheng Jun Sun, Yue Wu, Zhihua Xu, Bin Hu, Jianmin Bai, Jian Ping Wang, Jian Shen

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Abstract

Magnetic nanoparticles of CoFe are used as dopants to enhance the quantum efficiency of electroluminance in a single layer organic light emitting device (OLED). The enhancement of quantum efficiency increases with both increasing density of CoFe nanoparticles and external magnetic field. For a given OLED with 0.1 wt % doping, the enhancement of the quantum efficiency reaches ∼27% and ∼32% without and with a magnetic field, respectively. The origin of these improvements could be attributed to the simultaneous increases of the portion of excitons among total charge carriers and the fraction of singlets among the total excitons

Original language	English (US)
Article number	232110
Journal	Applied Physics Letters
Volume	90
Issue number	23
DOIs	https://doi.org/10.1063/1.2746415
State	Published - 2007

Bibliographical note

Funding Information:
This research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle and LLC for the U.S. Department of Energy under Contract No. DEAC05-00OR22725.

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title = "Enhancement of quantum efficiency of organic light emitting devices by doping magnetic nanoparticles",

abstract = "Magnetic nanoparticles of CoFe are used as dopants to enhance the quantum efficiency of electroluminance in a single layer organic light emitting device (OLED). The enhancement of quantum efficiency increases with both increasing density of CoFe nanoparticles and external magnetic field. For a given OLED with 0.1 wt % doping, the enhancement of the quantum efficiency reaches ∼27% and ∼32% without and with a magnetic field, respectively. The origin of these improvements could be attributed to the simultaneous increases of the portion of excitons among total charge carriers and the fraction of singlets among the total excitons",

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note = "Funding Information: This research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle and LLC for the U.S. Department of Energy under Contract No. DEAC05-00OR22725.",

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doi = "10.1063/1.2746415",

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T1 - Enhancement of quantum efficiency of organic light emitting devices by doping magnetic nanoparticles

AU - Sun, Cheng Jun

AU - Wu, Yue

AU - Xu, Zhihua

AU - Hu, Bin

AU - Bai, Jianmin

AU - Wang, Jian Ping

AU - Shen, Jian

N1 - Funding Information: This research was sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle and LLC for the U.S. Department of Energy under Contract No. DEAC05-00OR22725.

PY - 2007

Y1 - 2007

N2 - Magnetic nanoparticles of CoFe are used as dopants to enhance the quantum efficiency of electroluminance in a single layer organic light emitting device (OLED). The enhancement of quantum efficiency increases with both increasing density of CoFe nanoparticles and external magnetic field. For a given OLED with 0.1 wt % doping, the enhancement of the quantum efficiency reaches ∼27% and ∼32% without and with a magnetic field, respectively. The origin of these improvements could be attributed to the simultaneous increases of the portion of excitons among total charge carriers and the fraction of singlets among the total excitons

AB - Magnetic nanoparticles of CoFe are used as dopants to enhance the quantum efficiency of electroluminance in a single layer organic light emitting device (OLED). The enhancement of quantum efficiency increases with both increasing density of CoFe nanoparticles and external magnetic field. For a given OLED with 0.1 wt % doping, the enhancement of the quantum efficiency reaches ∼27% and ∼32% without and with a magnetic field, respectively. The origin of these improvements could be attributed to the simultaneous increases of the portion of excitons among total charge carriers and the fraction of singlets among the total excitons

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Enhancement of quantum efficiency of organic light emitting devices by doping magnetic nanoparticles

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