Stacked OLEDs connecting

To date, a variety of connecting units have been introduced for stacked OLEDs, which include Cs BCP/ITO [65], Cs BCP, LirBCP/VzOs [66,67], LirAlqg, Li l,3,5-tris(N-phenylbenzimidazol-2-yl) benzene (TPBIj/FeClgrNPB [68], MgrAlqg/WOg, V2O5, 2,3,5,6-tetrafluoro-7,7,8,8,-tetracyanoquinodimethane... 

The tandem structure demonstrates an operational stability of 1000 h, whereas the stabilized blue stack and the G-R-emitting stack have stabilities of 1300 and 1200 h, respectively, at SOmA/cm. The slightly lower stability of the tandem at the same current density is primarily due to the p-n connecting layer. The estimated lifetimes at 1000 cd/m in Table 14.3 show that a high-efficiency tandem OLED with a very high operational... 

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