Synthesis and Electroluminescence Properties of a series of Malononitrile Derivative Containing Hyper-branched Conjugated Polymers

• Main Authors: Li-Wei Liu, 劉力瑋
• Other Authors: Rong-Ho Lee
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/kbbj7c

碩士 === 國立雲林科技大學 === 化學工程與材料工程研究所 === 96 === A series of main chain polymers were synthesized by the Suzuki coupling reaction with malononitrile derivative and fluorine, or malononitrile derivative and Thiophene. Moreover, the hyperbranched polymers were synthesized by the same way with electron-withdrawing group triazine as molecular cores. All the polymers were end-capped with p-brombo-toluene. Four red light emitting polymers (LEPs) namely MPFM, HPFM, MPTM and HPTM were synthesized in this study. The maximal UV-Vis absorption and the PL emission of four polymers in solid film were 448, 457, 427, 447 nm and 572, 562, 585, 575 nm, respectively. After thermal annealing, the optical properties were changed with the morphology modification. The thermal annealing effect on electroluminescence properties of the polymer light emitting diodes are discussed. After annealing at 80 ℃ for 1 hr, the brightness, current efficiency, and Commission Internation de L’Eclairage CIE of HPFM were 1031 cd/m2, 1.97 cd/A, and CIE (0.48, 0.56), which was the best performance of four polymers. Then after annealing at 160 ℃ for 1hr , the brightness, current efficiency, and CIE of HPTM were 213 cd/m2, 0.11 cd/A and　CIE (0.64, 0.36). Deep red emission was observed. In this study, blue light emitting hyperbranched conjugated polymer PTFA10 was blended with 3 wt. %, 6 wt.% and 8 wt.% HPFM to fabricate white polymer light emitting diodes (WPLEDs). After annealing at 80 ℃ for 1 hr, the brightness, current efficiency, and CIE of the EPLEDs were 3523, 3252, 4173 cd/m2, and 2.19, 3.30, 4.69 cd/A, and (0.21, 0.34), (0.28, 0.49), and (0.23, 0.39).