The Trade-off Between Efficiency and Stability in Mn2+ Doped Perovskite Light-Emitting Diodes


While perovskite light-emitting diodes (PeLEDs) have demonstrated external quantum efficiencies (EQEs) well over 20%, their stability limits their commercial viability. Previously, the incorporation of transition metal dopants has demonstrated improved PeLED brightness, stability, and efficiency. Here, we dope Mn2+ ions into a quasi-bulk 3D perovskite and introduce tris(4-fluorophenyl)phosphine oxide (TFPPO) to achieve a 14.0% peak EQE and 128,000 cd/m2 peak luminance. However, while the incorporation of TFPPO dramatically increases PeLED EQE, their stability is severely compromised. At a 5 mA/cm2 electrical current bias, PeLEDs fabricated without TFPPO (2.97% EQE) and with TFPPO (14.0% EQE) decay to half their maximum luminance in 37.0 and 2.54 minutes, respectively. In order to investigate this trade-off in EQE and stability, we study both photophysical and optoelectronic characteristics before and after PeLED electrical operation. While Mn2+ doped PeLEDs hold the potential to enable bright and efficient lighting, device stability degradation mechanisms must be further investigated.


Supplementary material

Supplementary Information
More data including TFPPO Synthesis, AFM, Champion Brightness Devices, Higher TFPPO-treated PeLEDs, PeLED Stability Spectra, Additional Luminance Decay Curves and Extracted Optoelectronic Properties, TRPL Spectra, Additional TRPL Decay Curves, TRPL IRFs, and Summary of B-Site Doped PeLEDs