Microstructure and upconversion luminescence of Yb3+ and Ho3+ co-doped BST thick films Zhang, Tianjin ; Yu, Lin ; Wang, Jingyang ; Wu, Jiqing Abstract Publication: Journal of Materials Science Pub Date: December 2010 DOI: 10.1007/s10853-010-4781-0 Bibcode: 2010JMatS..45.6819Z