Conjugated PPV-derived block copolymers containing 2-ethylhexyloxynaphthalene unit were synthesized and characterized in this study. The resulting polymers were soluble in common organic solvents and showed good thermal stabilities. The weight-average molecular weights (M _w ) of the copolymers ranged from 246,000 to 475,000 with PDIs of 1.3∼2.1. The optical properties of these polymers, measured both in a chloroform solution and on a film, showed a maximum absorption at 405∼476 nm for Copolymers I∼VIII. In the PL spectra, Copolymers I∼VIII showed maximum peaks at 510∼566 nm. The HOMOs, LUMOs and band gaps of the PPV derivatives of Copolymers I∼VIII were 5.30∼5.77, 3.04∼3.24, and 2.5∼2.2 eV, respectively. The multi-layered, light-emitting diodes of ITO/PEDOT/copolymers/LiF/Al exhibited turn-on voltages of 6∼2.5 V. Copolymer VIII exhibited the maximum brightness of 3,657 cd/m². Particularly, Copolymer VII, with an identical composition of MEH-PPV and naphthalene-PPV, showed a maximum luminance efficiency and power efficiency of 2.63 cd/A and 1.06 lm/W, respectively.

中文翻译：

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含萘的有机发光共聚物的合成与表征

本研究合成并表征了含有2-乙基己基氧基萘单元的共轭PPV衍生的嵌段共聚物。所得聚合物可溶于常见的有机溶剂中并显示出良好的热稳定性。重均分子量（M _w ）的共聚物范围从246,000到475,000，PDI为1.3-2.1。在氯仿溶液中和在薄膜上测得的这些聚合物的光学性质对共聚物Ⅰ〜showed显示在405〜476nm处有最大吸收。在PL光谱中，共聚物I〜VIII在510〜566nm处显示最大峰。共聚物Ⅰ〜VIII的PPV衍生物的HOMO，LUMO和带隙分别为5.30〜5.77、3.04〜3.24和2.5〜2.2eV。ITO / PEDOT /共聚物/ LiF / Al的多层发光二极管的开启电压为6〜2.5V。共聚物VIII的最大亮度为3,657 cd / m ²。特别地，具有相同的MEH-PPV和萘-PPV组成的共聚物VII显示出最大亮度效率和功率效率分别为2.63cd / A和1.06lm / W。