Efficient red phosphorescent organic light emitting diodes with double emission layers
Efficient red phosphorescent organic light emitting diodes with double emission layers
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DOI：
10.1088/0022-3727/41/15/155111
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
M. Ben Khalifa;M. Mazzeo;V. Maiorano;F. Mariano;S. Carallo;A. Melcarne;R. Cingolani;G. Gigli
中科院分区：
文献类型：
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作者：
M. Ben Khalifa;M. Mazzeo;V. Maiorano;F. Mariano;S. Carallo;A. Melcarne;R. Cingolani;G. Gigli
我们展示了高效的红色磷光有机发光二极管与双极发射结构（D-EML）形成的两个不同的层掺杂红色磷光染料。由于其自平衡特性，复合区远离发射/载流子阻挡层界面。这防止了载流子在界面处的积累，并减少了三重态-三重态湮灭，导致与标准单EML架构相比D-EML器件的效率提高。然而，在10 mA cm-2时，D-EML器件的电流效率为8.4 cd A-1，而单EML器件的电流效率为3.7 cd A-1。
We demonstrate efficient red phosphorescent organic light emitting diodes with a bipolar emission structure (D-EML) formed by two different layers doped with a red phosphorescent dye. Due to its self-balancing character, the recombination zone is shifted far from the emission/carrier-blocking-layer interfaces. This prevents the accumulation of carriers at the interfaces and reduces the triplet–triplet annihilation, resulting in an improved efficiency of the D-EML device compared with the standard single-EML architecture. However, a current efficiency of 8.4 cd A−1 at 10 mA cm−2 is achieved in the D-EML device compared with 3.7 cd A−1 in the single-EML device.