点击次数：

论文类型：期刊论文

发表时间：2018-11-01

发表刊物：PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION

收录刊物：SCIE、Scopus

卷号：35

期号：11

ISSN号：0934-0866

关键字：emission enhancement; oxide; photon upconversion; vanadium sensitization

摘要：Photon upconversion of oxides nanomaterials have attracted broad attentions on account of their high stability and cost-effective fabrication process. However, the relative low emission intensity caused by nonradiative decay severely limits their applications. Here, a new strategy to enhance upconversion emission of oxides through vanadium sensitization is reported, in which efficient emissions can be achieved via Yb-VO43- dimer-mediated energy migration for a wide range of lanthanide activators (including Er, Tm, Ho, Eu, and Nd) in Yb3Al5O12 system. Interestingly, the resulting oxide nanocrystals demonstrate remarkable upconversion enhancement compared with their vanadium-undoped counterparts, for example, an enhancement factor of 580 is reached for green emission of Er. More importantly, efficient upconversion luminescence can be realized for the activators (such as Eu and Nd ions) without long-lived intermediary energy states. Considering the demonstration of in vivo bioimaging by using these nanocrystals after surface modification, it is anticipated that these results can bring new opportunities to oxide upconversion nanomaterials in bioassay, therapy, sensing, and other aspects.