Miscibility and luminescence properties of MEH-PPV/DPO-PPV polyblends

被引：16

作者：

Chou, HL ^{[1
]}

Lin, KF ^{[1
]}

Wang, DC ^{[1
]}

机构：

[1] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 10617, Taiwan

来源：

JOURNAL OF POLYMER RESEARCH | 2006年 / 13卷 / 01期

关键词：

conjugated polymers; luminescence; polymer light-emitting diode; poly(2-methoxy-5-(2-ethyl-hexyloxy)p-phenylenevinylene); polyblends;

D O I：

10.1007/s10965-005-9017-7

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Poly(2-methoxy-5-(2'-ethyl-hexyloxy)-p-phenylenevinylene) (MEH-PPV) and poly(2,3-diphenyl-5-octyl-p-phenylenevinylene) (DPO-PPV) are basically immiscible as verified by fluorescence spectroscopy and differential scanning calorimetry. This immiscibility results in insufficient energy transfer from DPO-PPV to MEH-PPV in photoluminescence. A vertically segregated structure with DPO-PPV green domains dispersing on the MEH-PPV-rich matrix was observed in a spin-cast film by two-photon excitation microscopy. The turn-on voltages for electroluminescence (EL) of polyblends were lower than those of their individual pristine polymers, while their EL quantum efficiencies were higher. Because both the highest occupied molecular orbital and the lowest unoccupied molecular orbital levels of MEH-PPV are higher than those of the DPO-PPV, the energy gap of the vertical heterojunction (1.98 eV) in polyblends is lower than that of the pristine MEH-PPV (2.14 eV), which is believed to result in the improved EL properties.

引用

页码：79 / 84

页数：6

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