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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/9048

Title: High electron mobility layers of triazines for improving driving voltages, power conversion efficiencies, and operational stability of organic light-emitting diodes
Authors: Matsushima, Toshinori
Takamori, Mayumi
Miyashita, Yuichi
Honma, Yoko
Tanaka, Tsuyoshi
Aihara, Hidenori
Murata, Hideyuki
Keywords: Organic light emitting diodes
Triazine derivatives
High electron mobility
Issue Date: 2010-01
Publisher: Elsevier
Magazine name: Organic Electronics
Volume: 11
Number: 1
Start page: 16
End page: 22
DOI: 10.1016/j.orgel.2009.09.016
Abstract: We have shown that triazine compounds of 2-biphenyl-4-yl-4,6-bis-(4′-pyridin-2-yl-biphenyl-4-yl)-[1,3,5]triazine (DPT) and 2,4-bis-biphenyl-4-yl-6-(4′-pyridin-2-yl-biphenyl-4-yl)-[1,3,5]triazine (MPT) work as excellent electron-transport layers (ETLs) of organic light-emitting diodes (OLEDs). By replacing a typical ELT of tris(8-hydroxyquinoline) aluminum (Alq_3) with the DPT ETL and the MPT ETL, driving voltages and power conversion efficiencies of OLEDs operated at a current density of 50 mA cm^<−2> are improved from 7.7 ± 0.2 V and 1.41 ± 0.10 lm W^<−1> (Alq_3) to 6.0 ± 0.1 V and 1.62 ± 0.09 lm W^<−1> (DPT) and 5.2 ± 0.1 V and 1.88 ± 0.18 lm W^<−1> (MPT), respectively. Half lifetimes of the OLEDs operated at the same current are also enhanced from 3200 h (Alq_3) to 4200 h (MPT) by using the MPT ETL. The reduction in driving voltage is found to arise from more efficient electron injection at interfaces of DPT/cathode (a barrier height of ≈0.61 eV) and MPT/cathode (a barrier height of ≈0.51 eV) than at an interface of Alq_3/cathode (a barrier height of ≈0.73 eV) as well as better electron mobilities of DPT (8.7 × 10^<−5> cm^2 V^<−1> s^<−1> at an electric field of 5.0 × 10^5 V cm^<−1>) and MPT (1.4 × 10^<−4> cm^2 V^<−1> s^<−1> at the same field) than that of Alq3 (4.1 × 10^<−6> cm^2 V^<−1> s^<−1> at the same field [Naka et al., Synth. Met. 111–112 (2000) 331.]). A high-mobility electron-transport material of 4,7-diphenyl-1,10-phenanthroline (Bphen) is also used as an ETL for comparison of OLED characteristics.
Rights: NOTICE: This is the author's version of a work accepted for publication by Elsevier. Toshinori Matsushima, Mayumi Takamori, Yuichi Miyashita, Yoko Honma, Tsuyoshi Tanaka, Hidenori Aihara and Hideyuki Murata, Organic Electronics, 11(1), 2010, 16-22, http://dx.doi.org/10.1016/j.orgel.2009.09.016
URI: http://hdl.handle.net/10119/9048
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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