Phase and Size Control of Core–Shell Upconversion Nanocrystals Light up Deep Dual Luminescence Imaging and CT In Vivo. Issue 11 (15th March 2016)

• Record Type: Journal Article
• Authors: Kang, Ning; Liu, Yu; Zhou, Yaming; Wang, Dong; Chen, Chuan; Ye, Shefang; Nie, Liming; Ren, Lei
• Is Part Of: Advanced healthcare materials. Volume 5:Issue 11(2016)
• Page Start: 1356
• Page End: 1363
• Publication Date: 2016-03-15
• Subjects: core–shell -- deep upconversion luminescence -- dual modality imaging -- lanthanide doping -- lutetium; Biomedical materials -- Periodicals; 610.28
• DOI: 10.1002/adhm.201600159
• Languages: English
• ISSNs: 2192-2640

Abstract

Abstract : Upconversion nanocrystals (UCNCs) have recently been explored as optical imaging nanoprobes. However, conventional β‐NaLuF4 ‐ based UCNCs often suffer from large particle size and weak upconversion luminescence (UCL) intensity, leading to poor biocompatibility and low detection sensitivity. Here, a novel strategy for controlling the crystalline phase and size of UCNCs has been developed by doping of yttrium ions, resulting in particle size reduction and phase transition. The total UCL intensity of prepared core–shell UCNCs is significantly enhanced up to ≈4.9 and ≈17.4 times after Tm 3+ and Er 3+ doping than that of core UCNCs, offering deeper tissue UCL imaging with a depth of 8 mm in vivo. Moreover, the CT signal of core–shell UCNCs is ≈1.5 and ≈3.5 times brighter than that of core UCNCs and commercial ioversol agent because of increasing contents of Lu 3+ doped in UCNCs. The synthesized core–shell UCNCs hold a great promise in deep UCL and CT dual‐modality imaging in vitro and in vivo. Abstract : The crystalline phase and size of NaLuF4 ‐ based Upconversion Nanocrystals is successfully controlled by a novel strategy using yttrium ion doping . Superior performance of the crystals is demonstrated in both, deep luminscence imaging and computer tomography.