Analysis of carrier traps in continuously operated 4,4′-bis[N-(1- naphthyl)-N-phenyl-amino]-biphenyl/tris(8-hydroxyquinoline)aluminum-based organic light-emitting diodes by thermally stimulated current measurement

Makoto Nakahara; Masahiro Minagawa; Takahito Oyamada; Toyoyasu Tadokoro; Hiroyuki Sasabe; Chihaya Adachi

doi:10.1143/JJAP.46.L636

Analysis of carrier traps in continuously operated 4,4′-bis[N-(1- naphthyl)-N-phenyl-amino]-biphenyl/tris(8-hydroxyquinoline)aluminum-based organic light-emitting diodes by thermally stimulated current measurement

Makoto Nakahara, Masahiro Minagawa, Takahito Oyamada, Toyoyasu Tadokoro, Hiroyuki Sasabe, Chihaya Adachi

Functional Materials Chemistry

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

We measured the reliability of two different organic light-emitting diodes (OLEDs) composed of indium tin oxide (ITO)/4,4′-bis[N-(1-naphthyl)-N- phenyl-amino]biphenyl (α-NPD)/tris(8-hydroxyquinoline)aluminum (Alq ₃)/MgAg (two layer) or ITO/α-NPD/α-NPD:Alq₃ (mixed layer)/Alq₃/MgAg. Changes in the carrier trap distribution were estimated by thermally stimulated current (TSC) measurements. Improved device reliability was observed in the mixed-layer device. In the case of the two-layer device, the TSC peaks gradually changed depending on the duration of continuous operation, while the mixed device showed no change in its TSC spectra. These spectral differences indicate that the mixing of α-NPD and Alq₃ occurs during the continuous operation in the two-layer device.

Original language	English
Pages (from-to)	L636-L639
Journal	Japanese Journal of Applied Physics
Volume	46
Issue number	25-28
DOIs	https://doi.org/10.1143/JJAP.46.L636
Publication status	Published - Jul 13 2007

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Engineering(all)
Physics and Astronomy(all)

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Nakahara, M., Minagawa, M., Oyamada, T., Tadokoro, T., Sasabe, H., & Adachi, C. (2007). Analysis of carrier traps in continuously operated 4,4′-bis[N-(1- naphthyl)-N-phenyl-amino]-biphenyl/tris(8-hydroxyquinoline)aluminum-based organic light-emitting diodes by thermally stimulated current measurement. Japanese Journal of Applied Physics, 46(25-28), L636-L639. https://doi.org/10.1143/JJAP.46.L636

Analysis of carrier traps in continuously operated 4,4′-bis[N-(1- naphthyl)-N-phenyl-amino]-biphenyl/tris(8-hydroxyquinoline)aluminum-based organic light-emitting diodes by thermally stimulated current measurement. / Nakahara, Makoto; Minagawa, Masahiro; Oyamada, Takahito et al.
In: Japanese Journal of Applied Physics, Vol. 46, No. 25-28, 13.07.2007, p. L636-L639.

Research output: Contribution to journal › Article › peer-review

Nakahara, M, Minagawa, M, Oyamada, T, Tadokoro, T, Sasabe, H & Adachi, C 2007, 'Analysis of carrier traps in continuously operated 4,4′-bis[N-(1- naphthyl)-N-phenyl-amino]-biphenyl/tris(8-hydroxyquinoline)aluminum-based organic light-emitting diodes by thermally stimulated current measurement', Japanese Journal of Applied Physics, vol. 46, no. 25-28, pp. L636-L639. https://doi.org/10.1143/JJAP.46.L636

Nakahara M, Minagawa M, Oyamada T, Tadokoro T, Sasabe H, Adachi C. Analysis of carrier traps in continuously operated 4,4′-bis[N-(1- naphthyl)-N-phenyl-amino]-biphenyl/tris(8-hydroxyquinoline)aluminum-based organic light-emitting diodes by thermally stimulated current measurement. Japanese Journal of Applied Physics. 2007 Jul 13;46(25-28):L636-L639. doi: 10.1143/JJAP.46.L636

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title = "Analysis of carrier traps in continuously operated 4,4′-bis[N-(1- naphthyl)-N-phenyl-amino]-biphenyl/tris(8-hydroxyquinoline)aluminum-based organic light-emitting diodes by thermally stimulated current measurement",

abstract = "We measured the reliability of two different organic light-emitting diodes (OLEDs) composed of indium tin oxide (ITO)/4,4′-bis[N-(1-naphthyl)-N- phenyl-amino]biphenyl (α-NPD)/tris(8-hydroxyquinoline)aluminum (Alq 3)/MgAg (two layer) or ITO/α-NPD/α-NPD:Alq3 (mixed layer)/Alq3/MgAg. Changes in the carrier trap distribution were estimated by thermally stimulated current (TSC) measurements. Improved device reliability was observed in the mixed-layer device. In the case of the two-layer device, the TSC peaks gradually changed depending on the duration of continuous operation, while the mixed device showed no change in its TSC spectra. These spectral differences indicate that the mixing of α-NPD and Alq3 occurs during the continuous operation in the two-layer device.",

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AU - Minagawa, Masahiro

AU - Oyamada, Takahito

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AU - Adachi, Chihaya

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N2 - We measured the reliability of two different organic light-emitting diodes (OLEDs) composed of indium tin oxide (ITO)/4,4′-bis[N-(1-naphthyl)-N- phenyl-amino]biphenyl (α-NPD)/tris(8-hydroxyquinoline)aluminum (Alq 3)/MgAg (two layer) or ITO/α-NPD/α-NPD:Alq3 (mixed layer)/Alq3/MgAg. Changes in the carrier trap distribution were estimated by thermally stimulated current (TSC) measurements. Improved device reliability was observed in the mixed-layer device. In the case of the two-layer device, the TSC peaks gradually changed depending on the duration of continuous operation, while the mixed device showed no change in its TSC spectra. These spectral differences indicate that the mixing of α-NPD and Alq3 occurs during the continuous operation in the two-layer device.

AB - We measured the reliability of two different organic light-emitting diodes (OLEDs) composed of indium tin oxide (ITO)/4,4′-bis[N-(1-naphthyl)-N- phenyl-amino]biphenyl (α-NPD)/tris(8-hydroxyquinoline)aluminum (Alq 3)/MgAg (two layer) or ITO/α-NPD/α-NPD:Alq3 (mixed layer)/Alq3/MgAg. Changes in the carrier trap distribution were estimated by thermally stimulated current (TSC) measurements. Improved device reliability was observed in the mixed-layer device. In the case of the two-layer device, the TSC peaks gradually changed depending on the duration of continuous operation, while the mixed device showed no change in its TSC spectra. These spectral differences indicate that the mixing of α-NPD and Alq3 occurs during the continuous operation in the two-layer device.

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Analysis of carrier traps in continuously operated 4,4′-bis[N-(1- naphthyl)-N-phenyl-amino]-biphenyl/tris(8-hydroxyquinoline)aluminum-based organic light-emitting diodes by thermally stimulated current measurement

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