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Highly efficient organic electroluminescent diodes realized by efficient charge balance with optimized electron and hole transport layers

机译:通过有效的电荷平衡以及优化的电子和空穴传输层实现高效有机电致发光二极管

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摘要

Highly efficient organic electroluminescent devices (OLEDs) were developed based on 4,7-diphenyl-1, 10-phenanthroline (BPhen) as the electron transport layer (ETL), tris-(8-hydroxyquinoline) aluminum (Alq_3) as the emission layer (EML) and N,N-bis-[1-naphthy(-N,Ndipheny1- 1,1'-biphenyl-4,4'-diamine)] (NPB) as the hole transport layer (HTL). The typical device structure was glass substrate/ ITO/ NPB/ Alq3/ BPhen/ LiF/ Al. Since BPhen possesses a considerable high electron mobility of 5 × 10~(-4) cm~2 V~(-1) s~(-1), devices with BPhen as ETL can realize an extremely high luminous efficiency. By optimizing the thickness of both HTL and ETL, we obtained a highly efficient OLED with a current efficiency of 6.80 cd/A and luminance of 1361 cd/m~2 at a current density of 20 mA/cm~2. This dramatic improvement in the current efficiency has been explained on the principle of charge balance.
机译:基于4,7-二苯基-1、10-菲咯啉(BPhen)作为电子传输层(ETL),三-(8-羟基喹啉)铝(Alq_3)作为发光层开发了高效有机电致发光器件(OLED) (EML)和N,N-双-[1-萘(-N,Ndipheny1-1,1'-联苯-4,4'-二胺)](NPB)作为空穴传输层(HTL)。典型的器件结构是玻璃基板/ ITO / NPB / Alq3 / BPhen / LiF / Al。由于BPhen具有5×10〜(-4)cm〜2 V〜(-1)s〜(-1)的相当高的电子迁移率,因此以BPhen作为ETL的器件可以实现极高的发光效率。通过优化HTL和ETL的厚度,我们获得了高效的OLED,在20 mA / cm〜2的电流密度下电流效率为6.80 cd / A,亮度为1361 cd / m〜2。电流效率的这种显着提高已根据电荷平衡原理进行了解释。

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