High-efficiency stacked white organic light-emitting diodes

作者：Lee Tae Woo^*; Noh Taeyong; Choi Byoung Ki; Kim Myeong Suk; Shin Dong Woo; Kido Junji

来源：Applied Physics Letters, 2008, 92(4): 043301.

DOI：10.1063/1.2837419

We report efficient tandem white organic light-emitting diodes (WOLEDs) by using bathocuproine:Cs(2)CO(3)/MoO(3) as an effective interconnecting layer. We utilized two primary colors of sky blue and orange fluorescent emitters to obtain efficient white electroluminescence. Although single WOLEDs using two adjacent emitting layers showed a maximum current efficiency of 7.96 cd/A with Commission Internationale d'Eclairage (CIE) coordinates of (0.28, 0.34), the tandem WOLED device made by stacking two single color OLEDs in series demonstrated doubled maximum current efficiency of 17.14 cd/A with CIE coordinates of (0.28, 0.41). The stacking of different single color OLEDs in series instead of double stacking of WOLEDs can be useful to achieve highly efficient WOLEDs because it can reduce the number of layers of the devices.

• 出版日期2008-1-28