Pushing the Efficiency Envelope for Semiconductor Nanocrystal-Based Electroluminescence Devices Using Anisotropic Nanocrystals
Pushing the Efficiency Envelope for Semiconductor Nanocrystal-Based Electroluminescence Devices Using Anisotropic Nanocrystals
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DOI：
10.1021/acs.chemmater.8b05366
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发表时间：
2019-05-14
影响因子：
8.6
通讯作者：
Lee, Doh C.
中科院分区：
文献类型：
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作者：
Kim, Whi Dong;Kim, Dahin;Lee, Doh C.
胶体半导体纳米晶体在显示技术中具有很大的应用前景，因为它具有可调的能级和窄的发射带宽，可以在色彩空间中实现宽的色域。对高能效、高色彩质量显示器的需求推动了对基于电驱动量子点的发光二极管（qd - led）的兴趣激增。虽然广泛的努力已经导致合成具有接近统一光致发光量子产率的量子点和制造具有外部量子效率达到理论极限（类似于20%）的量子点- led，但当使用球形量子点时，低外耦合因子对提高器件性能的方式提出了挑战。几何各向异性纳米晶体（NCs），如纳米棒或纳米片代表了一种独特的可能的解决方案，以提高光提取效率。在这个观点中，我们强调了各个各向异性nc及其在LED应用背景下组装的重要设计原则。
Colloidal semiconductor nanocrystals hold great promise in display technologies, as the tunable energy levels and narrow emission bandwidth allow for wide gamut in color space. Impetus for energy-efficient, high-color-quality display has driven the surge of interest in electrically driven quantum dot-based light emitting diodes (QD-LEDs). While extensive efforts have led to synthesis of QDs with near-unity photoluminescence quantum yield and fabrication of QD-LEDs with external quantum efficiency reaching to the theoretical limit (similar to 20%), low out-coupling factor poses a challenge in the way of improving the device performance when spherical QDs are used. Geometrically anisotropic nano crystals (NCs) such as nanorods or nanoplatelets represent a unique possible solution to enhancing light extraction efficiency. In this Perspective, we highlight important design principles of individual anisotropic NCs and their assembly in the context of LED applications.