Efficient electron injection in organic light-emitting diodes using dipotassium phthalate as n-type dopant

Meng Huan Ho; Ming Ta Hsieh; Jenn-Fang Chen; Shiao Wen Hwang; Chin H. Chen

doi:10.1889/1.3069609

Efficient electron injection in organic light-emitting diodes using dipotassium phthalate as n-type dopant

Meng Huan Ho^*, Ming Ta Hsieh, Jenn-Fang Chen, Shiao Wen Hwang, Chin H. Chen

^*Corresponding author for this work

Department of Electrophysics

Research output: Contribution to journal › Conference article › peer-review

Abstract

An efficient n-doped electron transport layer composed of 4, 7-diphenyl-1, 10-phenanthroline (BPhen) and dipotassium phthalate (PAK2) has been developed. By temperature-dependent admittance spectroscopy, the incorporation of PAK2 into BPhen is found to increase electron concentration in BPhen layer, resulting in raising the Fermi-level to ̃0.5 eV below its LUMO which further enhances the efficiency of electron injection from Al cathode. When this n-doped layer is adopted in OLED device, the green Alq₃ device can achieve a current efficiency of 3.6 cd/A and a power efficiency of 2.1 lm/W at 20 mA/cm ² and lower drive voltage of 5.3 V.

Original language	English
Pages (from-to)	2056-2059
Number of pages	4
Journal	Digest of Technical Papers - SID International Symposium
Volume	39
Issue number	1
DOIs	https://doi.org/10.1889/1.3069609
State	Published - 30 Oct 2008
Event	2008 SID International Symposium - Los Angeles, CA, United States Duration: 20 May 2008 → 21 May 2008

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abstract = "An efficient n-doped electron transport layer composed of 4, 7-diphenyl-1, 10-phenanthroline (BPhen) and dipotassium phthalate (PAK2) has been developed. By temperature-dependent admittance spectroscopy, the incorporation of PAK2 into BPhen is found to increase electron concentration in BPhen layer, resulting in raising the Fermi-level to{\~ }0.5 eV below its LUMO which further enhances the efficiency of electron injection from Al cathode. When this n-doped layer is adopted in OLED device, the green Alq3 device can achieve a current efficiency of 3.6 cd/A and a power efficiency of 2.1 lm/W at 20 mA/cm 2 and lower drive voltage of 5.3 V.",

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T1 - Efficient electron injection in organic light-emitting diodes using dipotassium phthalate as n-type dopant

AU - Ho, Meng Huan

AU - Hsieh, Ming Ta

AU - Chen, Jenn-Fang

AU - Hwang, Shiao Wen

AU - Chen, Chin H.

PY - 2008/10/30

Y1 - 2008/10/30

N2 - An efficient n-doped electron transport layer composed of 4, 7-diphenyl-1, 10-phenanthroline (BPhen) and dipotassium phthalate (PAK2) has been developed. By temperature-dependent admittance spectroscopy, the incorporation of PAK2 into BPhen is found to increase electron concentration in BPhen layer, resulting in raising the Fermi-level to ̃0.5 eV below its LUMO which further enhances the efficiency of electron injection from Al cathode. When this n-doped layer is adopted in OLED device, the green Alq3 device can achieve a current efficiency of 3.6 cd/A and a power efficiency of 2.1 lm/W at 20 mA/cm 2 and lower drive voltage of 5.3 V.

AB - An efficient n-doped electron transport layer composed of 4, 7-diphenyl-1, 10-phenanthroline (BPhen) and dipotassium phthalate (PAK2) has been developed. By temperature-dependent admittance spectroscopy, the incorporation of PAK2 into BPhen is found to increase electron concentration in BPhen layer, resulting in raising the Fermi-level to ̃0.5 eV below its LUMO which further enhances the efficiency of electron injection from Al cathode. When this n-doped layer is adopted in OLED device, the green Alq3 device can achieve a current efficiency of 3.6 cd/A and a power efficiency of 2.1 lm/W at 20 mA/cm 2 and lower drive voltage of 5.3 V.

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Efficient electron injection in organic light-emitting diodes using dipotassium phthalate as n-type dopant

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