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我院近期科研成果被国际学术媒体报道
张桥教授课题组与孙宝全教授课题组、美国加州大学河滨分校殷亚东教授课题合作在Journal of the American Chemical Society上发表论文
发布时间:2017-12-23 22:46:37 点击:

题目:

Interfacial Synthesis of Highly Stable CsPbX3/Oxide Janus Nanoparticles

 

作者:

Huicheng Hu,†,‡ Linzhong Wu,†,§,‡ Yeshu Tan,†,‡ Qixuan Zhong, Min Chen, Yinghua Qiu,† Di Yang, Baoquan Sun,†,* Qiao Zhang,†,* and Yadong Yin§,*

 

单位:

Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Institute of Functional Nano and Soft Materials (FUNSOM) Soochow University 199 Ren’ai Road, Suzhou, 215123 Jiangsu, P. R. China

§ Department of Chemistry, University of California, Riverside, Riverside, California 92521 United State

 

摘要:

The poor stability of CsPbX3 (X = Cl, Br, I) nanocrystals has severely impeded their practical applications. Although there are some successful examples on encapsulating multiple CsPbX3 nanocrystals into an oxide or polymer matrix, it has remained a serious challenge for the surface modification/encapsulation using oxides or polymers at a single particle level. In this work, monodisperse CsPbX3/SiO2 and CsPbBr3/Ta2O5 Janus nanoparticles were successfully prepared by combining a water-triggered transformation process and a sol-gel method. The CsPbBr3/SiO2 nanocrystals exhibited a photoluminescence quantum yield of 80% and a lifetime of 19.8 ns. The product showed dramatically improved stability against destruction by air, water, and light irradiation. Upon continuous irradiation by intense UV light for 10 h, a film of the CsPbBr3/SiO2 Janus nanocrystals showed only a slight drop (2%) in the PL intensity, while a control sample of unmodified CsPbBr3 nanocrystals displayed a 35% drop. We further highlighted the advantageous features of the CsPbBr3/SiO2 nanocrystals in practical applications by using them as the green light source for the fabrication of a prototype white light-emitting diode, and demonstrated a wide color gamut covering up to 138% of the National Television System Committee standard. This work not only provides a novel approach for the surface modification of individual CsPbX3 nanocrystals but also helps to address the challenging stability issue, therefore it has an important implication toward their practical applications.

 

影响因子:

13.858

 

分区情况:

1

 

链接:

http://pubs.acs.org/doi/10.1021/jacs.7b11003

 

责任编辑:向丹婷




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