Abstract: A light-emitting device including a first electrode, a second electrode facing the first electrode, and an interlayer arranged between the first electrode is provided. The second electrode includes an emission layer, wherein the emission layer includes a compound having both pyridine and anthracene groups geometrically arranged to provide an orthogonal relationship between planes defined by the two groups. The vibrational reorganization energy value of the organometallic compound is reduced by its molecular structure.

Abstract: The present disclosure provides a method of preparing a lube base oil. The method comprises (a) providing a feed stream, (b) separating the feed stream into at least two fraction streams comprising a first fraction stream and a second fraction stream, and (c) before or after the separating of the feed stream, introducing the feed stream or at least two fraction streams into a first and second hydro-processing treatments to produce at least two product streams, and the first product stream has a higher viscosity index (VI) than the second product stream. The present disclosure also provides a lube base oil and a lubricant composition comprising the lube base oil.