Vibrational mode contribution to the dielectric permittivity of disordered small-molecule organic semiconductors

Abstract

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Three-Dimensional Modeling of Organic Light-Emitting Diodes Containing Molecules with Large Electric Dipole Moments

“…For the 6.5 mol% CBP:Ir(ppy) 2 (acac) systems studied, Förster transfer is the most important process [55]. The Förster radius is close to the value of 1.6 nm that follows from a recent quantum-chemical calculation study [40]. Triplet quenching with electron or hole polarons (TPQ) on other emitter molecules and triplettriplet annihilation (TTA) involving two triplets on an emitter molecule are also described as a Förster-type process, with for both interactions a Förster radius of 3.5 nm.…”

“…1(a)]. For gas-phase molecules significantly different theoretical static dipole moments have been reported by several groups, ranging from 2.0 D [11] and 5.5 D [40] to 6.4 and 7.6 D [41]. In the latter study two conformers, in which the three subgroups are symmetrically equivalent or not, were distinguished.…”

The Many Facets of Molecular Orientation in Organic Optoelectronics

“…For organic semiconductors, the direction (or plane) of largest extent of π-conjugation is typically found to have the highest α-component, whereas it is smallest perpendicular to that plane. Using, for example, the Clausius-Mossotti relation α can be related to a macroscopic film property, namely the optical refractive index n: [31] n Nα ε ≈ +1, 0…”

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Aggregation‐Dependent Dielectric Permittivity in 2D Molecular Crystals

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