Improvement of efficiency and stability of polymer light-emitting devices by modifying indium tin oxide anode surface with ultrathin tetrahedral amorphous carbon film
Improvement of efficiency and stability of polymer light-emitting devices by modifying indium tin oxide anode surface with ultrathin tetrahedral amorphous carbon film
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DOI：
10.1063/1.1796527
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发表时间：
2005-02
影响因子：
4
通讯作者：
B. Chen;X. W. Sun;B. Tay;L. Ke;S. Chua
中科院分区：
文献类型：
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作者：
B. Chen;X. W. Sun;B. Tay;L. Ke;S. Chua
采用不同厚度的四面体非晶态碳超薄膜，在氧化铟、氧化锡和聚乙烯二氧基噻吩穴传输层之间制备了聚对苯乙撑基聚合物电致发光器件。与其他器件相比，具有0.5 nm四面体非晶碳(ta-C)层的器件具有最高的亮度和电流效率。没有ta-C层的标准器件在5V时的电流效率为1.1cd/A，而具有0.5 nm的ta-C层厚度的器件的电流效率为2.7cd/A，与标准器件相比，电流效率提高了2.5倍。效率的提高是由于阻断了来自阳极的空穴注入，平衡了空穴电流和电子电流。具有ta-C层的器件的寿命明显长于标准器件，并且具有0.5 nm ta-C层的器件具有最长的寿命。
Poly(p-phenylene vinylene)-based polymer light-emitting devices using different thicknesses of tetrahedral amorphous carbon ultrathin films between indium tin oxide and polyethylenedioxythiophene hole transporting layer have been fabricated. The device with a 0.5nm tetrahedral amorphous carbon (ta-C) layer has the highest luminance and current efficiency compared to that of other devices. The current efficiency of a standard device without a ta-C layer is 1.1cd∕A at 5V, however, the current efficiency of a device with a ta-C layer thickness of 0.5nm is 2.7cd∕A; the current efficiency is improved about 2.5 times compared to the standard device. The improvement of the efficiency is due to blocking the hole injection from anode and balancing the hole and electron current. The lifetime of a device with a ta-C layer is significantly much longer than the standard device, and the device with a 0.5nm ta-C layer has the longest lifetime.