The charge transport and recombination in light‐emitting diodes (LEDs) based on a methyl‐substituted poly(p‐phenylene) ladder polymer (Me‐LPPP) are investigated. The transport is characterized by a high room‐temperature hole mobility of 2 × 10⁻⁸ m² V⁻¹ s⁻¹ combined with anomalously strong electron trapping. Their electroluminescence (EL) spectrum is characterized by a blue singlet emission, a broad green featureless peak, and a yellow‐orange triplet emission. The voltage dependence of the EL spectrum and negative contribution to the capacitance indicate that the triplet‐emission is of trap‐assisted nature, consistent with the strong electron trapping. Consequently, the color purity of the blue emissive Me‐LPPP polymer LEDs can be strongly improved using trap dilution.

中文翻译：

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梯形聚合物发光二极管中的陷阱辅助三重态发射

研究了基于甲基取代的聚对苯撑梯形聚合物（Me-LPPP）的发光二极管（LED）中的电荷传输和复合。该传输的特点是具有2×10 ^-8 m ² V ^-1 s ^-1的高室温空穴迁移率结合异常强的电子陷阱。它们的电致发光（EL）光谱的特征是蓝色单峰发射，宽广的绿色无特征峰和橙黄色三重峰发射。EL光谱的电压依赖性和对电容的负贡献表明，三重态发射具有陷阱辅助性质，与强电子陷阱一致。因此，使用捕集阱稀释可以大大提高蓝色Me-LPPP聚合物LED的色纯度。