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P‐189: Vapor Pressures of Homo‐ and Heteroleptic Orthometalated Complexes of Iridium

Tris‐orthometalated complexes of iridium are the leading class of phosphorescent dopants for use in harvesting triplet state emission in OLEDs. Here we report vapor pressures of a group of homo‐ and heteroleptic orthometalated iridium complexes and derive the enthalpies and entropies of sublimation. Molecular features influencing these thermodynamic properties are discussed. Keywords: phosphorescent emitter, iridium complexes, sublimation, vapor pressures, enthalpy, entropy.