POS5-1271
Hydrogen Bond-Assisted Dual Passivation for Blue Perovskite Light-Emitting Diodes
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Cheolsun Park (Sungkyunkwan University)
Co-Author(s)
Abstract
Despite progress in red, green perovskite light-emitting diodes (LED), blue PeLEDs still show low efficiency and poor stability due to defects and inefficient carrier injection in solution-processed films. This work introduces diphenylphosphineamide(DPPA) as a dual-passivation additive. Density functional theory and experiments confirm that DPPA’s phosphine oxide group coordinates with undercoordinated Pb²⁺ ions, while its amino group forms hydrogen bonds with halide ions, reducing defect density and suppressing ion migration. As a result, blue quasi-2D PeLEDs with DPPA exhibit a 12.31% external quantum efficiency and 486 nm emission, along with 32% longer operational lifetime and enhanced spectral stability, demonstrating DPPA’s effectiveness in improving blue PeLED performance.
