Abstract In this work, we perform morphological and physicochemical studies of Dactylopius opuntiae (cochineal) with electron microscopy and explore their use as a transporting layer for organic electronic devices. The charge transport properties of this pigment were investigated through current-voltage measurements. The current-voltage characteristics have shown that the cochineal can be used as a hole-transporting layer (HTL) with mobility of 5.30 ± 0.03 × 10−4cm2V−1 s−1. Different analyses were realized on this pigment and the results were compared with other HTL organic compounds, as Poly(3,4-ethylene dioxy thiophene): poly(styrene sulfonate) (PEDOT:PSS). The results show that the cochineal pigment does not produce luminescence and has a band gap of 2.6 ± 0.2 eV with optical absorption in the visible range. The roughness of cochineal thin films was measured after filtering the solution with a value of 11.8 ± 0.2 nm. Cochineal and PEDOT:PSS were successfully used as HTL in the fabrication of a [Ir(fliq)2acac] based PHOLED. The results show an increase in the electroluminescent color purity emission due to the filtering action of the natural pigment when compared with the PEDOT:PSS based in this device.

中文翻译：

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Dactylopius opuntiae 及其作为薄膜在有机器件中的应用的研究

摘要 在这项工作中，我们使用电子显微镜对仙人掌（胭脂虫）进行形态学和物理化学研究，并探索它们作为有机电子器件传输层的用途。通过电流-电压测量研究了这种颜料的电荷传输特性。电流-电压特性表明胭脂虫可用作空穴传输层（HTL），迁移率为 5.30 ± 0.03 × 10-4cm2V-1 s-1。对该颜料进行了不同的分析，并将结果与​​其他 HTL 有机化合物进行了比较，如聚（3,4-乙烯二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）。结果表明，胭脂虫色素不发光，带隙为2.6±0.2eV，在可见光范围内有光吸收。将溶液过滤后测量胭脂虫薄膜的粗糙度，值为 11.8 ± 0.2 nm。Cochineal 和 PEDOT:PSS 被成功地用作 HTL，用于制造基于 [Ir(fliq)2acac] 的 PHOLED。结果表明，与基于该设备的 PEDOT:PSS 相比，由于天然色素的过滤作用，电致发光色纯度发射增加。