Cirignano Matilde, Roshan Hossein, Farinini Emanuele, Di Giacomo Alessio, Fiorito Sergio, Piccinotti Davide, Khabbazabkenar Sirous, Di Stasio Francesco, Moreels Iwan
Dipartimento di Chimica e Chimica Industriale, Università Degli Studi di Genova, Via Dodecaneso 31, 16146 Genoa, Italy.
Photonic Nanomaterials, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy.
Nanoscale. 2024 Dec 19;17(1):304-313. doi: 10.1039/d4nr03461a.
Obtaining efficient blue emission from CdSe nanoplatelets (NPLs) remains challenging due to charge trapping and sub-bandgap emission. Thanks to a design-of-experiments (DoE) approach, we significantly improved the NPL synthesis, obtaining precise control over the lateral aspect ratio (length/width). We raised the photoluminescence quantum efficiency up to 66% after growth of a CdS crown, with complete elimination of trap-state emission. Using these 3.5 monolayer, blue-emitting CdSe/CdS core/crown NPLs ( = 460 nm), we fabricated light-emitting diodes (LEDs) with narrowband (16 nm) blue electroluminescence, an external quantum efficiency of 1.3% and low turn-on voltage of 2.9 V after DoE optimization. Our findings show that NPLs are a promising system to obtain LEDs that emit a saturated blue color.
由于电荷俘获和子带隙发射，从硒化镉纳米片（NPLs）获得高效的蓝光发射仍然具有挑战性。得益于实验设计（DoE）方法，我们显著改进了NPL的合成，实现了对横向纵横比（长度/宽度）的精确控制。在生长硫化镉冠层后，我们将光致发光量子效率提高到了66%，并完全消除了陷阱态发射。使用这些3.5单层、发射蓝光的CdSe/CdS核/冠层NPLs（ = 460 nm），在DoE优化后，我们制造出了具有窄带（16 nm）蓝色电致发光、1.3%的外量子效率和2.9 V的低开启电压的发光二极管（LED）。我们的研究结果表明，NPLs是获得发射饱和蓝色光的LED的一个有前景的体系。
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