Scientific Reports 7: Article number: 43189; published online: 23 February 2017; updated: 06 April 2017

In the original version of this Article, there were errors in Affiliation 1 and 2 which were incorrectly listed as ‘School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, Guangdong, China’ and ‘School of Physics and Engineering, Sun Yat-sen Univeristy, Guangzhou 510275, Guangdong, China’ respectively.

The correct affiliations are listed below.

Affiliation 1

State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, Guangdong, China.

Affiliation 2

State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen Univeristy, Guangzhou 510275, Guangdong, China.

These errors have now been corrected in the PDF and HTML versions of the Article.