Prolonging the Lifetime of Quasi-2D Perovskite Blue LEDs via DMAcPA Doping for Defect Passivation

Abstract

In this study, we developed highly efficient quasi-2D blue perovskite light-emitting diodes (PeLEDs) by incorporating (4-(2,7-dibromo-9,9-dimethylacridin-10(9H)-yl)butyl)phosphonic acid (DMAcPA) into the perovskite precursor solution. DMAcPA significantly improved the crystal quality by reducing trap density by 52.47% and enhancing charge transport, resulting in a substantial increase in external quantum efficiency (EQE) and device stability. The carrier lifetime was extended by 2.67-fold, effectively minimizing heat issues caused by nonradiative recombination losses. As a result, the DMAcPA-doped devices exhibited exceptional stability, achieving a T80 lifetime of 720 hours and a mean time to failure (MTTF) of 42.1 days—nearly three times longer than their undoped counterparts. This work highlights the potential of DMAcPA as a highly effective additive for enhancing the performance and longevity of blue PeLEDs, paving the way for their broader application in advanced optoelectronic devices.