Brightness and Lifetime Improved Light-Emitting Diodes from Sr-Doped Quasi-Two-Dimensional Perovskite Layers

Green Perovskite Light-Emitting Diodes (PeLEDs) have attracted wide attention for full spectrum displays. However, the inferior film morphology and luminescence property of quasi-two-dimensional (quasi-2D) perovskite layers limit photoelectric PeLEDs. In this paper, effect strontium (Sr) doped in quasi-2D is investigated to obtain a high-quality active layer. The morphologies optical properties Sr-doped films with different concentrations are studied. With addition strontium, more low-dimensional-layer phases (n = 2 n 3) appear films, providing efficient intraband carrier funneling pathway facilitating radiative recombination. photoluminescence (PL) peak intensity optimized increases 50% compared non-strontium counterpart. Moreover, green PeLEDs based on layer reach maximum luminance (L max ) 2943.77 cd/m 2 , which three times control device. electroluminescence (EL) peaks Maximum External Quantum Efficiency (MEQE) Lmax exhibite slight shift, indicating excellent stability performance devices. device can continuously operate 360 s at MEQE driving voltage, resulting half-lifetime ~60 s, 3-fold greater than that