Effects of Charge Carrier Transport and Band Structure Models on the Performance of Blue-Emitting Polyfluorene-Based Light-Emitting Diodes

This paper investigates the effects of an extended Gaussian disorder model (EGDM), extended correlated disorder model (ECDM), constant mobility model, and Gaussian band and simple band structure models on the performance of single-layer polymer light-emitting diodes (PLED_s) based on polyfluorene blue light-emitting polymer. Also, the study examines the effects of N,N′-bis (1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (α-NPD) as the hole transport layer (HTL) and tris (8-hydroxyquinoline) aluminum (Alq₃) as electron transport layer (ETL) on the performance of these PLED devices with a Gaussian assumption band structure and EGDM transport models. For this purpose, a simulation method based on the physical drift-diffusion model and Newton computational method is used. It is revealed that in comparison between transport models with a Gaussian assumption band structure, the single-layer PLED devices with EGDM mobility model and constant mobility models have the best and the worst performance, respectively. In comparison between band structure models with an EGDM assumption transport model, the single-layer PLED device with Gaussian band structure has better performance than the single-layer PLED device with simple band structure. In comparison between single-layer, double-layer and three-layer PLED devices with an EGDM assumption transport model and Gaussian band structure model, the performances of three-layer PLED with α-NPD as HTL and Alq₃ as ETL and single-layer PLED devices are the best and the worst, respectively.