EMAT, University of Antwerp , Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
ACS Nano. 2017 Sep 26;11(9):9136-9142. doi: 10.1021/acsnano.7b03975. Epub 2017 Aug 15.
Robust luminophores emitting light with broadly tunable colors are desirable in many applications such as light-emitting diode (LED)-based lighting, displays, integrated optoelectronics and biology. Nanocrystalline quantum dots with multicolor emission, from core- and shell-localized excitons, as well as solid layers of mixed quantum dots that emit different colors have been proposed. Here, we report on colloidal supraparticles that are composed of three types of Cd(Se,ZnS) core/(Cd,Zn)S shell nanocrystals with emission in the red, green, and blue. The emission of the supraparticles can be varied from pure to composite colors over the entire visible region and fine-tuned into variable shades of white light by mixing the nanocrystals in controlled proportions. Our approach results in supraparticles with sizes spanning the colloidal domain and beyond that combine versatility and processability with a broad, stable, and tunable emission, promising applications in lighting devices and biological research.
在许多应用中，例如基于发光二极管 (LED) 的照明、显示器、集成光电子学和生物学，人们都希望使用能够发出宽波长可调颜色光的强荧光体。已经提出了具有多色发射的纳米晶量子点，包括核和壳局域激子的多色发射，以及发射不同颜色的混合量子点的固态层。在这里，我们报告了胶体超粒子，它由三种类型的发射红光、绿光和蓝光的 Cd(Se,ZnS) 核/(Cd,Zn)S 壳纳米晶体组成。通过以受控比例混合纳米晶体，超粒子的发射可以从纯颜色到复合颜色在整个可见光区域中变化，并微调为可变色调的白光。我们的方法得到的超粒子尺寸跨越胶体范围，其多功能性和可加工性与广泛、稳定和可调谐的发射相结合，有望在照明设备和生物研究中得到应用。
