High-efficiency polymer light-emitting diode via Al interfacial modification using polyurethane

Sung Nien Hsieh, Tzu Yin Kuo, Ten Chin Wen, Tzung Fang Guo, Yuh Lang Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


An efficient polymer light-emitting diode (PLED) was fabricated by inserting polyurethane (PU) between a poly(2-methoxy-5-(2′-ethylhexyloxy)- 1,4-phenylene vinylene) layer and an Al cathode. The electroluminescence (EL) efficiency of the PU-based device can reach 1.27 cd/A, which is much higher than that of a device without PU (0.015 cd/A). The enhanced performance is attributed to both the hole-blocking capacity of the PU layer and the specific interaction between PU and the deposited Al, significantly facilitating the injection of electrons. Furthermore, the electron injection ability of PU-based devices was found to strongly depend on the thicknesses of the PU and Al layers.

Original languageEnglish
Pages (from-to)L773-L776
JournalJapanese Journal of Applied Physics
Issue number29-32
Publication statusPublished - 2006 Aug 11

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy


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