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Blue CdSe/CdS core/crown nanoplatelet light-emitting diodes obtained via a design-of-experiments approach
Nanoscale ( IF 5.8 ) Pub Date : 2024-11-13 , DOI: 10.1039/d4nr03461a Matilde Cirignano, Hossein Roshan, Emanuele Farinini, Alessio Di Giacomo, Sergio Fiorito, Davide Piccinotti, Sirous Khabbazabkenar, Francesco Di Stasio, Iwan Moreels
Nanoscale ( IF 5.8 ) Pub Date : 2024-11-13 , DOI: 10.1039/d4nr03461a Matilde Cirignano, Hossein Roshan, Emanuele Farinini, Alessio Di Giacomo, Sergio Fiorito, Davide Piccinotti, Sirous Khabbazabkenar, Francesco Di Stasio, Iwan Moreels
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 (λ = 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.
中文翻译:
通过实验设计方法获得的蓝色 CdSe/CdS 核心/冠状纳米片发光二极管
由于电荷捕获和亚带隙发射,从 CdSe 纳米片 (NPL) 获得高效的蓝色发射仍然具有挑战性。得益于实验设计 (DoE) 方法,我们显著提高了 NPL 综合,获得了对横向纵横比(长度/宽度)的精确控制。在 CdS 冠生长后,我们将光致发光量子效率提高到 66%,完全消除了陷阱态发射。使用这些 3.5 单层、蓝色发射 CdSe/CdS 核心/冠状 NPL (λ = 460 nm),我们制造了具有窄带 (16 nm) 蓝色电致发光、1.3% 的外部量子效率和 2.9 V 的低导通电压的发光二极管 (LED)。我们的研究结果表明,NPL 是获得发出饱和蓝色的 LED 的有前途的系统。
更新日期:2024-11-13
中文翻译:
通过实验设计方法获得的蓝色 CdSe/CdS 核心/冠状纳米片发光二极管
由于电荷捕获和亚带隙发射,从 CdSe 纳米片 (NPL) 获得高效的蓝色发射仍然具有挑战性。得益于实验设计 (DoE) 方法,我们显著提高了 NPL 综合,获得了对横向纵横比(长度/宽度)的精确控制。在 CdS 冠生长后,我们将光致发光量子效率提高到 66%,完全消除了陷阱态发射。使用这些 3.5 单层、蓝色发射 CdSe/CdS 核心/冠状 NPL (λ = 460 nm),我们制造了具有窄带 (16 nm) 蓝色电致发光、1.3% 的外部量子效率和 2.9 V 的低导通电压的发光二极管 (LED)。我们的研究结果表明,NPL 是获得发出饱和蓝色的 LED 的有前途的系统。