Performance of Narrow-linewidth Red Emitted Electroluminescent Devices Based on Quasi-two-dimensional Perovskite
Metal halide perovskite light-emitting diodes (PeLEDs) have wide color gamut and high color purity,with broad application prospects in lighting and displays.A groundbreaking study by a research team at the Universi-ty of London published in Scientific Reports found that exposure to red light for just 3 minutes a day could significantly alleviate vision decline.The tunability of perovskite's spectrum and its high color purity provide assurance for the re-alization of eye-protective red-emitted PeLEDs.Unlike previous interface engineering or ligand engineering meth-ods,this paper proposes a new approach to enhance the external quantum efficiency (EQE) of quasi-two-dimensional perovskite red PeLEDs by combining them with microcavity structures to achieve narrower linewidths in electrolumi-nescent devices.The results show that by integrating distributed Bragg reflectors (DBRs) with PeLEDs,narrow line-width high-performance PeLEDs based on microcavity structures were designed and fabricated,achieving a doubling of EQE on top of narrowing the electroluminescence (EL) full width at half maximum for microcavity PeLEDs,with a maximum EQE reaching 11.26％.Compared to reference devices prepared under the same conditions,PeLED devic-es with microcavity structures narrowed their EL linewidth to one-third that of reference devices,only 11 nm.
quasi-two-dimensional perovskitedistributed Bragg mirrorred emittedelectroluminescencehalf-height full width
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