P‐15.1: Optical Modeling Simulation and Experiment of Narrow‐Band Emission Tandem OLEDs, Solution‐Processed Hole Injection/Transport OLEDs and Organic Light Emitting Transistors

Abstract

This study shows the investigations of Multi‐resonance thermally activated delayed fluorescence (MR‐TADF) materials and solution‐processed holes injection/transport layers (HITLs) in organic light‐emitting diodes (OLEDs), while extending to Organic Light Emitting Transistors (OLETs). Firstly, we explore TBN‐TPA, a blue MR‐TADF material, in single‐unit and tandem OLEDs via optical simulation. The tandem architecture enhances color purity, achieving a narrow full width at half maximum down to 24 nm, thus meeting BT 2020 standards. This marks the first instance of tandem OLEDs improving both efficiency and color performance of a multi‐resonance TADF emitter. Concurrently, we investigate the regulation of solution‐processed HITL compositions in OLEDs, aiming to improve charge injection and optical waveguiding. The adoption of solution‐processed HITLs reduces the turn‐on voltage and enhances power efficiency by 8.81% at a brightness of 5000 cd/m2 compared to vacuum‐deposited HITLs. By adjusting the composition of solution‐based PEDOT:PSS/TAPC as HITL, we effectively mitigate hole injection barriers and improve surface morphology, establishing an optical waveguide within the OLED structure. This holistic investigation employs optical simulation to advance high‐performance and cost‐effective OLEDs and OLETs for lighting and displays.