35.3: High‐Performance Tandem White OLEDs Using a Li‐Free “P‐N” Connector

A nonmetallic connector has been developed for high-efficiency tandem white architecture. Forming the “N” type layer using NDN-26 doped into NET-18 and inserting an organometallic thin layer between the “N” and “P” layers results in a high-performance connector. An efficiency of 33 cd/A has been achieved at 6.7 V, 1000 cd/m2 and 10000K color temperature in a fluorescent based tandem emitter. This >15% EQE device also demonstrates a half-life of ∼80,000 h at 1000 cd/m2.