Recently, there has been tremendous interest in the synthesis and optoelectronic applications of quasi-two-dimensional colloidal nanoplatelets (NPLs). Thanks to the ultranarrow emission linewidth, high-extinction coefficient, and high photostability, NPLs offer an exciting opportunity for high-performance optoelectronics. However, until now, the applications of these NPLs are limited to available discrete emission ranges, limiting the full potential of these exotic materials as efficient light emitters. Here, we introduce a detailed systematic study on the synthesis of NPLs based on the alloying mechanisms in core/shell, core/alloyed shell, alloyed core/shell, and alloyed core/alloyed shell heterostructures. Through the engineering of the band gap supported by the theoretical calculations, we carefully designed and successfully synthesized the NPL emitters with continuously tunable emission. Unlike conventional NPLs showing discrete emission, here, we present highly efficient core/shell NPLs with fine spectral tunability from green to deep-red spectra. As an important demonstration of these efficient emitters, the first-time implementation of yellow NPL light-emitting diodes (LEDs) has been reported with record device performance, including the current efficiency surpassing 18.2 cd A^–1, power efficiency reaching 14.8 lm W^–1, and record luminance exceeding 46 900 cd m^–2. This fine and wide-range color tunability in the visible range from stable and efficient core/shell NPLs is expected to be extremely important for the optoelectronic applications of the family of colloidal NPL emitters.

中文翻译：

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工程化合金异质结构实现的准2D纳米片的光谱宽范围可调，高效且明亮的胶体发光二极管

最近，人们对准二维胶体纳米片（NPL）的合成和光电应用产生了极大的兴趣。由于超窄发射线宽，高消光系数和高光稳定性，不良贷款为高性能光电提供了令人兴奋的机会。但是，直到现在，这些不良贷款的应用仅限于可用的离散发射范围，从而限制了这些奇特材料作为有效发光器的全部潜力。在这里，我们基于核/壳，核/合金壳，合金核/壳和合金核/合金壳异质结构中的合金化机理，对NPL的合成进行了详尽的系统研究。通过理论计算支持的带隙工程，我们精心设计并成功合成了具有连续可调发射的NPL发射器。与显示不连续发射的常规NPL不同，在这里，我们介绍了具有从绿色到深红色光谱的精细光谱可调性的高效核/壳NPL。作为这些高效发射器的重要证明，据报道，黄色NPL发光二极管（LED）的首次实现具有创纪录的器件性能，包括电流效率超过18.2 cd A^–1，功率效率达到14.8 lm W ^–1，并且记录的亮度超过46 900 cd m ^–2。稳定和有效的核/壳NPL在可见光范围内的这种精细和宽范围的颜色可调性，对于胶体NPL发射体系列的光电应用而言非常重要。