Multi-chromatic silicon nanocrystals  

作　　者：Benjamin Bruhn Benjamin JM Brenny Sidoeri Dekker Ilker Doğan Peter Schall Katerina Dohnalová 

机构地区：[1]Van der Waals-Zeeman Institute,University of Amsterdam,Science Park 904,Amsterdam 1098 XH,The Netherlands [2]Center for Nanophotonics,AMOLF,Science Park 104,Amsterdam 1098 XG,The Netherlands [3]Department of Applied Physics,Eindhoven University of Technology,P.O.Box 512,Eindhoven 5600 MB,The Netherlands [4]Dutch Institute for Fundamental Energy Research(DIFFER),P.O.Box 6336,Eindhoven 5600 HH,The Netherlands

出　　处：《Light(Science & Applications)》2017年第1期721-728,共8页光（科学与应用)（英文版）

基　　金：supported by a MacGillavry Fellowship(K.D.);the Stichting voor Fundamenteel Onderzoek der Materie(FOM);which is part of the Netherlands Organisation for Scientific Research(NWO,K.D.,I.D.);NanoNextNL program(I.D.)funded by the Dutch Ministry of Economic Affairs and Vici fellowship from NWO(B.B.and P.S.)。

摘　　要：Silicon nanocrystals(SiNCs)have great potential to become environmental friendly alternatives to heavy-metal containing nanocrystals for applications including medical imaging,lighting and displays.SiNCs exhibit excellent photostability,non-toxicity and abundant resources,but their often reported inefficient and spectrally limited light emission seriously impair their applications.Here we demonstrate a new method that converts SiNCs into an efficient and robust multi-chromatic phosphor.Using~15 keV electron-beam irradiation of oxide-capped SiNCs,we introduce several types of color centers into the nanocrystal’s oxide shell with efficient blue,green and red emission bands,together yielding warm-white photoluminescence,even for a single SiNC.Introduced centers are not native to the original system and we relate them to known defects in silica.Unlike in the silica host,however,here the centers are efficiently optically excitable.Provided further optimization and up-scaling of this method,e-beam irradiated SiNCs can be of great interest as white phosphors for applications such as LEDs.

关 键 词：cathodoluminscence color center electron beam multi-chromaticity silicon nanocrystals 

分 类 号：TB3[一般工业技术—材料科学与工程]