胶体半导体纳米片由于其一维量子限域效应而展现出多种优越的光学特性，但俄歇复合严重限制了胶体纳米片的光学性能，阻碍了其光电子器件的发展。本项目提出利用窄带宽的CdSe纳米片来实现新一代超宽色域的显示应用。拟通过在CdSe纳米片与CdS冠层之间包覆CdSeS合金冠层来形成平缓的核冠界面势垒，以达到抑制界面缺陷和俄歇复合进而提高纳米片光增益性能的目的，并辅以ZnO溶胶钝化纳米片表面缺陷来提高光学性能稳定性。采用超快光谱技术研究CdSe/CdSeS/CdS核冠纳米片的光增益特性，通过超辐射理论分析该纳米片光增益弛豫过程中的多激子复合动力学机制。不断优化合金冠层的结构，研制出光学性能优异的CdSe/CdSeS/CdS@ZnO纳米片，并基于该纳米片制备高性能的应用于显示背光源的白光LED及激光器件。本项目研究有助于揭示CdSe基核冠纳米片的光增益动力学机制，并促进纳米片发光器件向实用型显示背光源发展。

Colloidal semiconductor nanoplatelets (NPLs) exhibit various superior optical properties owing to their unique one-dimension quantum confinement effect, but the Auger recombination (AR) limits the optical performance of colloidal NPLs and also hinders the development of their optoelectronic devices. This project proposes that the narrow-bandwidth CdSe NPLs could achieve a new generation of ultra-wide color gamut display applications. The smoothed core/crown interfacial potential will be structured by depositing the CdSeS alloyed crown between the profile of CdSe and CdS crown, which further suppresses interfacial defects and AR, thus enhancing the optical gain performance of NPLs. Meanwhile, the ZnO sol is used to improve their optical stability. Moreover, the ultrafast spectroscopy technology will be employed to study the optical gain properties of CdSe/CdSeS/CdS core/crown NPLs. The mechanism of multiexcitons recombination dynamics during the optical gain relaxation process in NPLs will be analyzed by means of the Superradiation theory. CdSe/CdSeS/CdS@ZnO NPLs with the excellent optical properties would be obtained by continuously optimizing the alloyed crown structure, which could be also used to fabricate high-performance white LED and lasers as the backlight of display devices. The study is helpful to reveal the mechanism of optical gain dynamics for CdSe based core/crown NPLs, and also advance the development of NPLs luminescent devices to practical display backlight.