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

Research output: Contribution to journalConference articlepeer-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 languageEnglish
Pages (from-to)2056-2059
Number of pages4
JournalDigest of Technical Papers - SID International Symposium
Volume39
Issue number1
DOIs
StatePublished - 30 Oct 2008
Event2008 SID International Symposium - Los Angeles, CA, United States
Duration: 20 May 200821 May 2008

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