Efficient, Color‐Stable, and Long‐Lived White Organic Light‐Emitting Diodes Utilizing Phosphorescent Molecular Aggregates
Lydia Ameri, Linyu Cao, Xinqiang Tan, Jian Li
Abstract
Abstract Highly efficient and stable single‐stack hybrid white organic light‐emitting diode (WOLED) devices are developed using two emissive layers: one with amber‐colored phosphorescent molecular‐aggregate emission from the Pd(II) complex, Pd(II) 7‐(3‐(pyridine‐2‐yl‐κN)phenoxy‐κC)(benzo‐κC)([ c ]benzo[4,5]imidazo‐κN)[1,2‐ a ][1,5]naphthyridine, Pd3O8‐Py5, and the other with blue fluorescence emission. An optimized device structure achieves high color stability under various current densities, an external quantum efficiency (EQE) of 45.5%, a power efficiency of 97.4 Lm W −1 , and an estimated LT 95 (operational time to 95% of the initial luminance) of 50 744 h at an initial luminance of 1000 cd m −2 .