Effect of exciton diffusion on the triplet-triplet annihilation rate in organic semiconductor host-guest systems

Abstract

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Direct Transition from Triplet Excitons to Hybrid Light–Matter States via Triplet–Triplet Annihilation

“…However, the value is still smaller than that of the current solid state TTA-UC devices (10 –19 to 10 –18 m 3 s –1 ). 57 , 58 This can be explained by a reduced wave function overlap. The polaritonic states are delocalized, while the excitonic triplet states are localized in space.…”

Kinetic Monte Carlo Study of Triplet-Triplet Annihilation in Conjugated Luminescent Materials

“…We finally address the question of modeling excitation transport via the energetic-disorder-controlled Miller-Abrahams or polaronic-activation-controlled Marcus approach, which has always been a topic of debate in the community [60]. Coehoorn and co-workers have been able to successfully model charge transport and exciton dynamics in OLEDs by simply incorporating the Miller-Abrahams transport rates [1,32,[40][41][42]. The recent full quantum treatment of charge-carrier dynamics in amorphous organic semiconductors indeed confirms that the MA approach captures the salient features of transport, albeit at low temperatures [61].…”

“…For host-guest systems, the Eindhoven group have investigated the diffusion of triplets in detail by using transient PL measurements coupled with KMC simulations, and have analyzed the relative contribution of singlestep Förster-type triplet-triplet interactions and the multistep triplet diffusion processes to the mechanism of TTA in phosphorescent host-guest systems [1,32,[40][41][42][43]. The results from the Eindhoven group stimulated us to consider the contribution of dipole-dipole-coupling-induced long-range Förster rate to the triplet hopping in addition to the short-range Dexter rate [1,[40][41][42]. The impact of increasing the Förster contribution to triplet transport on the temperature dependence of quenching, DF and Ph events is shown in Fig.…”

Coupled 3D master equation and 1D drift‐diffusion approach for advanced OLED modeling

“…Alternatively, these processes can also be modeled using long-range Förster type interactions. [11][12][13] Coupling to a thin film optics simulation furthermore provides the quantity F i , which is defined as…”