[1L1-2]
Hole-Transport Layer Engineering for Enhanced Perovskite LEDs
발표자이재민 (한국화학연구원)
연구책임자이재민 (한국화학연구원)
Abstract
Perovskite light-emitting diodes (PeLEDs) are promising for displays, but efficiency, voltage, and stability remain challenges. We show that hole-transport layer (HTL) engineering is key to overcoming these limits. A solution-processed triple-layer HTL improved charge balance and reduced turn-on voltage, yielding EQEs above 12%. Interfacial doping with phosphomolybdic acid (PMA) further lowered operating voltage and extended lifetime fourfold. Polymer tailoring with OctSMe and OctOMe enabled smoother hole injection, reduced roll-off, and >1.6× higher luminance than TFB. For blue PeLEDs, a fluorene-expanded arylamine polymer (OctMef) enhanced hole mobility >20-fold, achieving EQEs over 5% with reduced voltage. Together, these results highlight that systematic HTL design—via multilayer structuring, interfacial modification, and molecular engineering—offers a versatile route to efficient and stable PeLEDs across the visible spectrum.