Tandem organic light-emitting diodes with KBH_4 doped 9,10-bis(3-(pyridin-3-yl)phenyl) anthracene connected to the charge generation layer

• DOI: 10.1364/oe.20.014564
• Publication Date: 2012-06-14T19:29:28Z
• Authors: Lian Duan; Taiju Tsuboi; Yong Qiu; Yanrui Li; Guohui Zhang
• Keywords: Tandem; Quantum Efficiency

Tandem organic light emitting diodes (OLEDs) are ideal for lighting applications due to their low working current density at high brightness. In this work, we have studied an efficient electron transporting layer of KBH(4) doped 9,10-bis(3-(pyridin-3-yl)phenyl)anthracene (DPyPA) which is located adjacent charge generation MoO(3)/NPB. The excellent property the DPyPA:KBH(4) helps tandem OLED achieve a lower voltage than device with widely used tris-(8-hydroxyquinoline)aluminum:Li. For white fluorescent blue unit and phosphorescent yellow unit, we've achieved efficiency 75 cd/A, can be further improved 120 cd/A by attaching diffuser layer.