Application of Polymer Optoelectronic Materials in OLED and Preparation of POSS/SWCNTs Hybrid Nanocomposites

• Main Authors: Shih, Hsi-Kang, 史習岡
• Other Authors: Zhu, Chao-Yuan
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/00471319172514554542

博士 === 國立交通大學 === 應用化學系碩博士班 === 104 === The interaction between polymer chains is important to apply in various fields. In this study, we investigated the different cross-linking process for application of polymer optoelectronic materials as hole injection/transporting layer materials in Organic light-emitting diodes (OLED) in the frist part (chapter 1, 3, and 4). In the second part (chapter 2 and 5) we investigated a hybrid nanomaterials with multidimensional structures through supramolecular interactions. In the first part, we used a new process for modifying a polymeric material for using as hole injection transport layer in organic light-emitting diodes has been studied, which is through 2 + 2 photodimerization of a DNA-mimetic -conjugated poly(triphenylamine-carbazole) presenting pendent uracil groups (PTC-U) under 1 h of UV irradiation. Multilayer phosphorescence OLED device with the PTC-U-1hr as a hole injection/transport layer is fabricated by successive spin-coating processes, and a remarkable improvement in performance (Qmax = 9.68%, Bmax = 41,466 cd/m2, and LEmax = 36.6 cd/A) relative to the commercial product (poly(3,4-ethylenedioxy-thiophene): polystyrenesulfonate) PEDOT:PSS (Qmax = 4.29%, Bmax = 15,678 cd/m2, and LEmax = 16.2 cd/A) has been achieved. We also have synthesized TPABZ, a new thermally cross-linkable triphenylamine derivative containing a benzoxazine functional group, for application in OLEDs. TPABZ is readily polymerized through ring-opening polymerization of its benzoxazine unit, upon heating at 220 oC for 30 min. The cured TPABZ (P-TPABZ) is suitable for use as a hole injection/transport material in OLEDs, and we fabricated multilayered OLEDs (ITO/TPABZ or P-TPABZ/NPB/Alq3/LiF/Al); the device incorporating P-TPABZ exhibited good performance (EQE: 2.44%; LEmax: 8.42 cd A−1; PEmax: 4.34 lm W−1). In the second part, we investigated ternary polybenzoxazine/POSS/SWCNT hybrid nanocomposites stabilized through supramolecular interactions. We linked zero-dimensional POSS with one-dimensional SWCNTs as dual-dimensional nanohybrid complexes within polybenzoxazine matrices, stabilized through noncovalent supramolecular interactions. First, we synthesized a new bifunctionalized benzoxazine (Py-Bz-T), presenting thymine (T) and pyrene (Py) units, that displayed excellent thermal properties after thermal curing, because its T moieties increased the physical cross-linking density. Second, we prepared Py-Bz-T/OBA-POSS nanocomposites and investigated the multiple hydrogen bonding A···T interactions between Py-Bz-T and OBA-POSS. Finally, we prepared Py-Bz-T/OBA-POSS/SWCNT ternary hybrid complexes dispersed in THF, stabilized through both multiple hydrogen bonding and – stacking interactions.