A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
Z. W. Yang, Y. D. Wang, J. Y. Liao, J. Z. Yang, J. B. Qiu, Z. G. Song. "Upconversion Emission Modification and White Light Generation in NaYF4:Yb3+, Er3+, Tm3+Nanocrystals/Opal Photonic Crystal Composites." IEEE Photonics Journal 7.6 (2015) 1-8