单颗粒稀土纳米晶的三基色上转换发光

可调谐发光颜色的上转换荧光纳米粒子具有广阔的应用前景。本文设计并成功合成了结构紧凑的多层核-壳纳米颗粒。在不同波段激光的泵浦下,该颗粒中不同壳层分别产生红、绿、蓝3种颜色的上转换荧光。光谱测试结果表明,样品三基色发光的颜色纯度较好,并且可以实现全色域的颜色实时调节。此外,还测试了样品发光强度与泵浦功率之间的依赖关系,用于研究其中的上转换发光机理。这种在单颗粒水平上具有全色域可调发光的紧凑核-壳结构纳米晶体在多通道生物检测及成像、超高分辨率显示器件、高端防伪应用等领域显示出巨大的潜力。

Three-primary-color Upconversion in Single Lanthanide Based Nanoparticle

Upconversion nanocrystals capable of tunable emitting color have shown wide application prospects.In this paper,we designed and successfully synthesized compact multi-layer core-shell nanocrystals.Different layers in a nanocrystal respectively produce upconversion luminescence with red,green and blue color,excited by various lasers.The emitting color with high purity can be further tuned in real-time within full color range.In addition,the luminescence intensity dependences on the pump power were recorded and used to investigate the luminescence mechanisms.The proposed compact core-shell nanocrystal with tunable color in a single nanoparticle shows great potentials for the applications such as bio-detection and imaging,display devices with ultrahigh resolution and advanced anti-counterfeiting.