Surface modification of TiO2 by a self-assembly monolayer in inverted-type polymer light-emitting devices

Sung Nine Hsieh, Shih Pin Chen, Chen Yan Li, Ten Chin Wen, Tzung Fang Guo, Yao Jane Hsu

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


A self-assembled monolayer, N-[3-(trimethoxysily)propyl]ethylenediamine (PEDA-TMS), is employed to modify a titanium dioxide (TiO2) surface for tuning its conduction band to match the energy level of high-yellow phenyl-substituted poly(para-phenylenevinylene) copolymer (HY-PPV) for fabricating inverted-type polymer light-emitting diodes (I-PLEDs). Ultraviolet photoemission spectroscopy (UPS) and electron-dominated devices were used to investigate changes of the electron-injection barrier. A PEDA-TMS-modified device achieved much higher brightness (3148 cd/m2) than that of the bare TiO2 device (no luminescence). The air stability of the proposed device is highly improved by the use of stable electrodes and injection layers. These significant improvements make TiO2 application to PPV-based PLEDs.

Original languageEnglish
Pages (from-to)1626-1631
Number of pages6
JournalOrganic Electronics
Issue number8
Publication statusPublished - 2009 Dec

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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