The Photoelectrical Properties of Conjugated Polymer Blends

• Main Author: 林琦博
• Other Authors: Ching-I Huang
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/32696965925899956651

碩士 === 國立臺灣科技大學 === 工程技術研究所材料科技學程 === 90 === We study the photoelectrical properties of conjugated polymer/conjugated polymer blends and conjugated polymer/organic small-molecule blends. In particular, we examine the effects of sorts and composition of blending materials on the analysis of absorption spectra, photoluminescent (PL) spectra, and electroluminescent (EL) spectra. We use poly(3-decylthiophene) (P3DT) and poly(N-vinylcarbazole)(PVK) as conjugated polymers, trimer of N-arylbenzimidazoles (TPBI）and CTCH5 as organic small-molecules. For the binary A/B blends, in which A component is P3DT and B component is PVK or CTCH5 or TPBI, due to the fact that B component transfers energy or charge to P3DT component, the emission peaks of EL spectra are closed to that of P3DT. Furthermore, in P3DT/PVK or P3DT/CTCH5 systems, with increasing the amount of B such that weight concentration of B is larger than 0.6, the emission peaks from PVK or CTCH5 occur, indicating that the energy or charge transfer is not a hundred percent. On the other hand, in P3DT/TPBI systems with any composition, as TPBI transfers energy or charge to P3DT completely, we observe no emission peaks from TPBI of the EL spectra. In CTCH5/PVK systems, the EL spectra manifest the fact that PVK transfers energy completely to CTCH5, such that there exist the only emission peaks from CTCH5.The current-voltage (I-V) analysis shows that the addition of P3DT in the blends lowers the onset voltage significantly. In CTCH5/PVK systems, we also observe that the onset voltage decreases as CTCH5 amount decreases.