Surface modification of TiO2 by a self-assembly monolayer in inverted-type polymer light-emitting devices
✍ Scribed by Sung-Nine Hsieh; Shih-Pin Chen; Chen-Yan Li; Ten-Chin Wen; Tzung-Fang Guo; Yao-Jane Hsu
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 379 KB
- Volume
- 10
- Category
- Article
- ISSN
- 1566-1199
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✦ Synopsis
A self-assembled monolayer, N- [3-(trimethoxysily)propyl]ethylenediamine (PEDA-TMS), is employed to modify a titanium dioxide (TiO 2 ) 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/m 2 ) than that of the bare TiO 2 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 TiO 2 application to PPV-based PLEDs.