聚合物发光电化学电池:在这种情况下形成发光p-n连接
Journal of the American Chemical Society
|September 1, 2016
概括
研究人员使用聚1,4-乙烯和聚乙烯氧化物开发了固态聚合物发光电化学电池. 这些电池形成了一个动态的p-n连接点,可以有效地发出绿色光线,这表明了先进显示技术的潜力.
科学领域:
- 材料科学
- 有机电子
- 电化学
背景情况:
- 固态聚合物发光电化学电池 (PLEC) 是传统照明和显示技术的有希望的替代品.
- 开发高效和稳定的排放材料对于提高PLEC性能至关重要.
- 了解聚合物混合物的电荷传输和光发射机制是优化设备架构的关键.
研究的目的:
- 使用聚1,4-乙烯 (PPV) 和聚乙烯氧化物 (PEO) 与三甲硫酸盐复合的固态PLEC制造和表征.
- 在外部偏差下研究聚合物薄膜内的动态,可逆的p-n连接的形成和特性.
- 评估电光性能,包括启动电压,发光率,外部量子效率和响应时间.
主要方法:
- 用氧化物 (ITO) 和电极制造三层电池,将聚合物混合膜成三明治.
- 在合聚合物层中应用外部偏移来诱导p-doping和n-doping,形成发光的p-n连接.
- 设备性能的表征,包括电流电压测量,电光谱,发光率和响应时间.
主要成果:
- 成功制造出显示绿光排放的固态PLEC.
- 观察一个动态和可逆的p-n连接点,其内置电位接近带间隙 (2.4 eV对于PPV).
- 在3V时达到8cd/m2,在4V时达到100cd/m2的启动电压.
- 记录了0.3-0.4%的光子/电子的外部量子效率.
- 最初的响应时间约为1秒,受到离子扩散的限制,随后的操作在微秒范围内.
结论:
- 制造的固态PLEC通过动态形成的p-n连接表现出高效的光发射.
- 聚合物电解质为注和装置操作提供必要的离子导电性.
- 这些发现突显了聚合物混合物和电解质复合物的潜力,用于开发先进的可溶液处理的有机发光装置.
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