Light-emitting diode (LED) represents a modern energy-efficient technology that can potentially address the societal needs. Perovskite light-emitting diode (PeLED) offers several attractive features that include emission color tunability, high emission intensity, selective emission color, and potentially low production cost using naturally abundant materials. This work discovered that passivating the CsPbBr3 perovskite with long alkyl chains of cetylpyridinium bromide (CPB) and cetyltrimethylammonium bromide (CTAB), together with bromide ions, enabled the suppression of nonradiative recombination. This resulted in increased radiative emission without shifting the band gap. When tested using a simple device structure, the measured luminance was found to strongly depend on the treatment of perovskite using CPB and CTAB. It should be noted that the approach of using passivation agents to enhance the performance of PeLED is both simple and effective and may be extended to other complex device structures to achieve superior performance. Such contributions are consistent with the affordable/clean energy and the climate action SDG goals.
“Enhanced electroluminescence of cesium lead bromide light-emitting diode driven by ion migration via surface passivation with organic halide surfactants” Srisawad, K.; Kanjanaboos, P.; Wilairat, P.; Sahasithiwat, S.; Pakawatpanurut, P. Surfaces and Interfaces 2022, 30, 101853.