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High-performance blue perovskite light-emitting diodes based on the a??far-field plasmonic effecta?? of gold nanoparticles
摘要： Metal halide perovskites have become the next-generation electroluminescent materials due to their excellent optoelectronic properties. In the last several years, there has been tremendous progress in the performance of red and green-light perovskite electroluminescent devices (PeLEDs) with external quantum efficiencies (EQE) exceeding 14% and 21%, respectively. In contrast, blue PeLEDs are still in infancy stage, due to EQEs below 1%. Therefore, development of blue PeLEDs is sorely needed since blue light plays a vital role in achieving full-color and white-light emission. In order to improve the efficiency of blue PeLEDs, herein we introduce gold nanoparticles (Au NPs) into poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transport layer (HTL) to achieve a high performance blue PeLEDs with an emission wavelength ~475 nm. By introducing Au NPs, the optical properties of poly(ethylene oxide) (PEO):PEA2(CsPbBrxCl3?x)n?1PbBr4 perovskite films have been significantly improved leading to 3.8 times enhancement in fluorescence intensity. Based on this improvement, the blue PeLEDs record a maximum luminance and EQE of ~1110 cd/m2 and 1.64%, respectively performing among the best reported so far. Finally, the PeLED performance improvement is attributed to the far-field surface plasmonic effect of Au NPs. This effect is originated from the interference between the original chromophores emission and the mirror-reflected emission of mirror-type substrates. This study not only reveals the function of Au NPs in development of blue PeLEDs, but also offers new insights into the fundamental physics underlying the effect of surface plasmon resonance of Au NPs on perovskite light emitting devices.
关键词： gold nanoparticles,blue PeLEDs,Metal halide perovskites,far-field plasmonic effect,external quantum efficiency
更新于2025-09-19 17:13:59
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Bright and Color-Stable Blue-Light-Emitting Diodes based on Three-Dimensional Perovskite Polycrystalline Films via Morphology and Interface Engineering
摘要： Substantial progress has been achieved in red and green perovskite light-emitting diodes (PeLEDs). However, blue PeLEDs are still inferior in light-emitting efficiency and luminance compared with their green and red counterparts. Herein efficient blue PeLEDs simultaneously achieving high luminance and high color stability are fabricated based on the polycrystalline perovskites with a 3D Rb?Cs alloyed scaffold. The synergistic manipulation of an isopropanol antisolvent treatment and the PEDOT:PSS/blue perovskite interface modification with RbCl effectively improve the photoluminescence properties of the resultant blue polycrystalline 3D perovskite films and the final electroluminescence performance of the blue PeLEDs. The optimized blue PeLEDs show a maximum external quantum efficiency of 1.66% with an emission peak at 484 nm and a full width at half-maximum of 18 nm as well as CIE coordinates of (0.08, 0.21). Moreover, the optimized blue PeLEDs not only show superior color stability under various luminances but also achieve high luminances. The obtained maximum luminance of 9243 cd m?2 is one of the highest values among the efficient and color-stable blue PeLEDs.
关键词： blue PeLEDs,perovskite light-emitting diodes,Rb?Cs alloyed scaffold,color stability,high luminance
更新于2025-09-19 17:13:59