Prolonging the lifetime of quasi-2D perovskite blue LEDs via DMAcPA doping for defect passivation

Abstract

In this study, we report the development of high-performance quasi-2D blue perovskite light-emitting diodes (PeLEDs) through the incorporation of (4-(2,7-dibromo-9,9-dimethylacridin-10(9H)-yl)butyl)phosphonic acid (DMAcPA) into the perovskite precursor solution. The introduction of DMAcPA significantly enhances crystal quality by reducing trap density by 52.47% and improving charge transport, leading to notable gains in both external quantum efficiency (EQE) and device stability. A 2.67-fold increase in carrier lifetime effectively mitigates heat-related issues stemming from nonradiative recombination losses. As a result, DMAcPA-doped devices demonstrate remarkable operational stability, achieving a T80 lifetime of 720 hours and a mean time to failure (MTTF) of 42 days—nearly three times longer than undoped counterparts. These findings highlight the potential of DMAcPA as a powerful additive for defect passivation and performance enhancement, offering a promising pathway toward the realization of stable and efficient blue PeLEDs for next-generation optoelectronic applications.