Organic Light‐Emitting Diodes Combining Thick Inorganic Perovskite Hole Transport Layers and Ultrathin Emitting Layers

• DOI: 10.1002/adom.202401061
• Publication Date: 2024-07-12T06:43:33Z
• Authors: Michele Forzatti; Sang‐Hyun Chin; M Angeles Hernánd...; Michele Sessolo; Daniel Tordera; Henk J. Bolink

Abstract Organic light‐emitting diodes have a huge gain in popularity over the past 25 years for display and lighting applications, but production of low‐cost efficient devices remains challenge. OLEDs using sub‐nanometer undoped emissive layers are route to fabricate cost‐effective but, as they inherently thin, it opens issues with variation thickness shunting paths. At same time, lead chloride perovskites currently being investigated charge transport materials owing their wide bandgap, remarkable high carrier mobility. In this work, first that combine vacuum‐processed thick cesium perovskite hole ultrathin Ir complex‐based reported. Defects on film suppressed emitting layer is optimized. Semitransparent also fabricated an average visible transmittance 50%. The results show extraordinarily (>1 µm) low turn‐on voltage (3.3 V), luminance (>15 000 cd m −2 ) efficiencies (up 54.1 A −1 ), negligible efficiency roll‐off applications region.