Lithium hydride doped intermediate connector for high-efficiency and long-term stable tandem organic light-emitting diodes

Lei Ding, Xun Tang, Mei Feng Xu, Xiao Bo Shi, Zhao Kui Wang, Liang Sheng Liao

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Lithium hydride (LiH) is employed as a novel n-dopant in the intermediate connector for tandem organic light-emitting diodes (OLEDs) because of its easy coevaporation with other electron transporting materials. The tandem OLEDs with two and three electroluminescent (EL) units connected by a combination of LiH doped 8-hydroxyquinoline aluminum (Alq3) and 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT-CN) demonstrate approximately 2-fold and 3-fold enhancement in current efficiency, respectively. In addition, no extra voltage drop across the intermediate connector is observed. Particularly, the lifetime (T75%) in the tandem OLED with two and three EL units is substantially improved by 3.8 times and 7.4 times, respectively. The doping effect of LiH into Alq3, the charge injection, and transport characteristics of LiH-doped Alq3 are further investigated by ultraviolet photoelectron spectroscopy (UPS) and X-ray photoemission spectroscopy (XPS).

Original languageEnglish
Pages (from-to)18228-18232
Number of pages5
JournalACS Applied Materials and Interfaces
Volume6
Issue number20
DOIs
Publication statusPublished - Oct 22 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science

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