Metal halide perovskites have the advantages of solution processing, high photoluminance quantum efficiency, and high charge carrier mobility. They are widely used in the field of Light-Emitting Diodes (LEDs). Inverted iodized-based perovskite LEDs (PeLEDs) with zinc oxide-based Electron Transporting Layers (ETLs) show high efficiency and long lifetime. However, the bromine-based type shows low device efficiency. The main challenge lies in the preparation of high-quality bromine-based perovskites on the zinc oxide-based ETLs. In this study, we controlled the component ratios in the bromine-based perovskite precursor to realize high-quality bromine-based perovskites on the ZnMgO ETL and achieved green PeLED with a peak External Quantum Efficiency (EQE) of 14.45%.
The white LED lighting technology has been widely used in daily life, due to the high efficiency, low cost, and remarkable energy conservation. Traditional cold white LED products based on yellow phosphor YAG: Ce3+ and blue LED chips is with low color rendering index due to lack of warm red part, and cannot meet the requirements of indoor lighting. Mn4+ doped fluoride material is one kind of narrow red phosphors emerging in recent years used for both display and lighting. However, the moisture resistance of the Mn4+ doped fluoride phosphor is poor at present. Herein, we modified the Mn4+ doped [N(CH3)4]2TiF6 red phosphor by introducing mixed of external organic ligands to coating the effective luminescent cores, which could significantly improve the fluorescence stability in humidity at room temperature.
Metal halide perovskite has the advantages of facile manufacture, high color purity and good spectral stability, which has a broad application prospect in light-emitting diodes (LEDs). Balanced charge transportation and recombination is vital for efficient perovskite light-emitting diodes (PeLEDs). In this work, we applied ZnO films with different thickness as electron transport layer (ETL) in near-infrared PeLEDs to modulate electron transportation. With controlled ZnO films, the external quantum efficiency (EQE) of PeLEDs is improved from 3.81% to 12.24%. The improvements provide a broad research prospect for efficient PeLEDs.
All-inorganic copper based metal halides have aroused wide attention as emissive materials due to their excellent optoelectronic properties, such as high photoluminescence quantum yield (PLQY) and good environmental stability. We report a facile low temperature solution process to obtain high quality Cs3Cu2I5 film by using chlorobenzene (CB) as antisolvent. The light-emitting diodes based on the high quality Cs3Cu2I5 films as emissive layers achieved a luminance of 74 cd/m2 and an external quantum efficiency (EQE) of 0.013%.
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