期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 965, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2023.171499
关键词
Perovskite; LED; Energy-well; Exciton confinement; Spray-coating
A breakthrough in enhancing the exciton confinement effect in perovskite light-emitting diodes (PeLEDs) is achieved by introducing a Cs4PbBr6 layer on a CsPbBr3 perovskite film through spray-coating deposition. The Cs4PbBr6 layer results in a confined energy-wall band structure and stronger exciton binding energy, leading to higher photoluminescence and electroluminescence from the PeLEDs.
Perovskites possess bright emission and high color purity, but constructing strong charge confinement is requisite for application in efficient light-emitting diodes. Here, we demonstrate a breakthrough to enhance the exciton confinement effect by introducing a Cs4PbBr6 layer on a CsPbBr3 perovskite film through the spray-coating deposition. The impact of the Cs4PbBr6 layer is thoroughly investigated and indicates that the Cs4PbBr6 layer results in a confined energy-wall band structure and a stronger exciton binding energy. Accordingly, the CsPbBr3 film with Cs4PbBr6 wall exhibits higher photoluminescence (PL) and electroluminescence (EL) from the perovskite light-emitting diodes (PeLEDs). We further optimize the device architecture in an energy-well band structure by sandwiching the CsPbBr3 between the Cs4PbBr6 buried layer and overlayer. As a result, the PeLED with Cs4PbBr6 well exhibits similar to 18 nm of full width at half maximum (FWHM) in the emission spectrum, 25,738 cd m(-2) of maximum luminance, 65.94 cd A(-1) of maximum current efficiency (CE), 15.08% of maximum external quantum efficiency (EQE).
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