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12月12日下午北区学术报告

来源： 发布时间：2017-12-11【字体：大 中 小】

　　题目：Rare earth activated upconversion materials for highly sensitive non-contact thermometers 

    时间：2017年12月12日 15：00

    地点：北区单元技术中心（玻璃）大会议室

　　报告人：高国军博士 Karlsruhe Institute of Technology (KIT, Germany)

　　报告人简历：

　　Guojun Gao got the Doctor degree of engineering from University of Jena (Germany) in 2013. Currently, he is a post-doctor researcher in Karlsruhe Institute of Technology (KIT, Germany). His research focuses on novel multi-dimensional opto-electronic materials: chemical designs, novel synthesis approaches, structure-properties relations, and their photonic applications. He has published 30 SCI-indexed papers 23 as first or corresponding author). The total citation time is > 600; the citation without self-citation is > 550, H-index is 17. He got Chinese Government Self-financed Oversea Student Award in 2012. He is regular reviewer for wide range of SCI-indexed journals including: Chem. Soc. Rev., Inorg. Chem., Nanoscale, Opt. Lett., Opt. Express, Opt. Mate. Express, J. Am. Ceram. Soc., etc. More than 20 referee reports are written every year.   

　　报告摘要： 

　　Finely tuned up-conversion (UC) emission colors while maintaining high UC emission efficiency are important for many applications, e.g., photonic markers, anticounterfeiting, plastic recycling, etc. Firstly, finely tuned NIR-to-visible La2O3:Yb,Re (Re = Er, Ho and Tm) UC materials with high UC quantum yield (UCQY) will be presented. The UC emission colors of La2O3:Yb,Er from green to reddish-orange while maintaining the high UCQY can be precisely tailored. La2O3:Yb,Ho and La2O3:Yb,Tm respectively yield efficient pure green and NIR (at ~800 nm) UC emission with UCQY equivalent to that of La2O3:Yb,Er. Secondly, Yb3+/Nd3+ co-doped La2O3 microcrystal thermometer upon excitation of 980 nm laser diode (LD) as a potential candidate for NIR ratio-metric thermometer will be presented. The combined features of suitable energy gap (ΔE) value of 950 cm-1, weak thermal quenching effect and high peak emission maximum temperature (833 K), high relative sensitivity (SR) of 1334/T2, excellent repeatability of FIR, and impressively low temperature uncertain ∆Tmin of 0.1 K make them promising as non-contact NIR ratio-metric thermometers over a wide temperature range up to 1233 K.  

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