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

研究成果: ジャーナルへの寄稿学術誌査読

44 被引用数 (Scopus)

抄録

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).

本文言語英語
ページ(範囲)18228-18232
ページ数5
ジャーナルACS Applied Materials and Interfaces
6
20
DOI
出版ステータス出版済み - 10月 22 2014
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 材料科学一般

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