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

Abstract

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 to charge generation layer of MoO(3)/NPB. The excellent transporting property of the DPyPA:KBH(4) layer helps the tandem OLED to achieve a lower voltage than the tandem device with the widely used tris-(8-hydroxyquinoline)aluminum:Li. For the tandem white OLED with a fluorescent blue unit and a phosphorescent yellow unit, we've achieved a high current efficiency of 75 cd/A, which can be further improved to 120 cd/A by attaching a diffuser layer.

Efficient tandem organic light-emitting device based on photovoltaic-type connector with positive cycle

“…This result is consistent with the general concept that the tandem OLEDs with two EL units show the current efficiency of about two times larger than the non-tandem OLEDs. 18 This indicates that the present OPV-type layers work as CGC. As presented in inset of Fig.…”

Thermally activated delayed fluorescence‐based tandem OLEDs with very high external quantum efficiency

“…The device from Refs. are tandem white OLEDs combined with conventional fluorescence and phosphorescence emitters. It is obvious that the CE of our TADF/phosphorescent hybrid tandem white OLED is comparable and even higher than those of the conventional fluorescent/phosphorescent hybrid tandem devices, though the EQE as reported in Ref.…”

Highly Efficient Hybrid White Tandem Organic Light‐Emitting Diodes with MoO3 Layer

“…[36] We also found that KBH 4 -doped DPyPA reduces the driving voltage due to its high conductivity. [42] From these experiences we used DPyPA and KBH 4 -doped DPyPA as ETL and EIL in both EL1 and EL2 units.…”