Efficient and colour-stable hybrid white organic light-emitting diodes utilizing electron-hole balanced spacers

Dong Seok Leem; Ji Whan Kim; Sung Ouk Jung; Seul Ong Kim; Se Hoon Kim; Kee Young Kim; Yun Hi Kim; Soon Ki Kwon; Jang Joo Kim

doi:10.1088/0022-3727/43/40/405102

Efficient and colour-stable hybrid white organic light-emitting diodes utilizing electron-hole balanced spacers

Dong Seok Leem, Ji Whan Kim, Sung Ouk Jung, Seul Ong Kim, Se Hoon Kim, Kee Young Kim, Yun Hi Kim, Soon Ki Kwon, Jang Joo Kim

KU-KIST Graduate School of Converging Science and Technology

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

16 Citations (Scopus)

Abstract

High-efficiency two-colour white organic light-emitting diodes (WOLEDs) comprising a newly synthesized iridium complex orange phosphor ((impy) ₂Ir(acac)) and a blue fluorophor (BD012) have been realized by placing several kinds of thin spacers between two emitters. Hybrid WOLEDs with a spacer composed of a hole-transporting N, N-dicarbazolyl-3,5-benzene (mCP) and an electron-transporting 4,7-diphenyl-1,10-phenanthroline (Bphen) exhibit a high external quantum efficiency (EQE) of up to 8.4% and a negligible colour change (the colour coordinate of (0.39, 0.41) at 1000 cdm^-2) with increasing brightness, whereas the device using a hole-transporting mCP spacer shows a relatively low EQE of 6.2% and a large shift of emitting colour with increasing brightness. Device performance is further characterized based on the charge transport behaviour of the spacers inserted between the two emitters.

Original language	English
Article number	405102
Journal	Journal of Physics D: Applied Physics
Volume	43
Issue number	40
DOIs	https://doi.org/10.1088/0022-3727/43/40/405102
Publication status	Published - 2010 Oct 13

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Acoustics and Ultrasonics
Surfaces, Coatings and Films

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title = "Efficient and colour-stable hybrid white organic light-emitting diodes utilizing electron-hole balanced spacers",

abstract = "High-efficiency two-colour white organic light-emitting diodes (WOLEDs) comprising a newly synthesized iridium complex orange phosphor ((impy) 2Ir(acac)) and a blue fluorophor (BD012) have been realized by placing several kinds of thin spacers between two emitters. Hybrid WOLEDs with a spacer composed of a hole-transporting N, N-dicarbazolyl-3,5-benzene (mCP) and an electron-transporting 4,7-diphenyl-1,10-phenanthroline (Bphen) exhibit a high external quantum efficiency (EQE) of up to 8.4% and a negligible colour change (the colour coordinate of (0.39, 0.41) at 1000 cdm-2) with increasing brightness, whereas the device using a hole-transporting mCP spacer shows a relatively low EQE of 6.2% and a large shift of emitting colour with increasing brightness. Device performance is further characterized based on the charge transport behaviour of the spacers inserted between the two emitters.",

author = "Leem, {Dong Seok} and Kim, {Ji Whan} and Jung, {Sung Ouk} and Kim, {Seul Ong} and Kim, {Se Hoon} and Kim, {Kee Young} and Kim, {Yun Hi} and Kwon, {Soon Ki} and Kim, {Jang Joo}",

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AU - Leem, Dong Seok

AU - Kim, Ji Whan

AU - Jung, Sung Ouk

AU - Kim, Seul Ong

AU - Kim, Se Hoon

AU - Kim, Kee Young

AU - Kim, Yun Hi

AU - Kwon, Soon Ki

AU - Kim, Jang Joo

PY - 2010/10/13

Y1 - 2010/10/13

N2 - High-efficiency two-colour white organic light-emitting diodes (WOLEDs) comprising a newly synthesized iridium complex orange phosphor ((impy) 2Ir(acac)) and a blue fluorophor (BD012) have been realized by placing several kinds of thin spacers between two emitters. Hybrid WOLEDs with a spacer composed of a hole-transporting N, N-dicarbazolyl-3,5-benzene (mCP) and an electron-transporting 4,7-diphenyl-1,10-phenanthroline (Bphen) exhibit a high external quantum efficiency (EQE) of up to 8.4% and a negligible colour change (the colour coordinate of (0.39, 0.41) at 1000 cdm-2) with increasing brightness, whereas the device using a hole-transporting mCP spacer shows a relatively low EQE of 6.2% and a large shift of emitting colour with increasing brightness. Device performance is further characterized based on the charge transport behaviour of the spacers inserted between the two emitters.

AB - High-efficiency two-colour white organic light-emitting diodes (WOLEDs) comprising a newly synthesized iridium complex orange phosphor ((impy) 2Ir(acac)) and a blue fluorophor (BD012) have been realized by placing several kinds of thin spacers between two emitters. Hybrid WOLEDs with a spacer composed of a hole-transporting N, N-dicarbazolyl-3,5-benzene (mCP) and an electron-transporting 4,7-diphenyl-1,10-phenanthroline (Bphen) exhibit a high external quantum efficiency (EQE) of up to 8.4% and a negligible colour change (the colour coordinate of (0.39, 0.41) at 1000 cdm-2) with increasing brightness, whereas the device using a hole-transporting mCP spacer shows a relatively low EQE of 6.2% and a large shift of emitting colour with increasing brightness. Device performance is further characterized based on the charge transport behaviour of the spacers inserted between the two emitters.

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Efficient and colour-stable hybrid white organic light-emitting diodes utilizing electron-hole balanced spacers

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