Magnetic field enhanced upconversion luminescence and magnetic-optical hysteresis behaviors in NaYF4: Yb, Ho nanoparticles Chen, P. ; Zhong, Z. ; Jia, H. ; Zhou, J. ; Han, J. ; Liu, X. ; Qiu, J. Abstract Publication: RSC Advances Pub Date: 2016 DOI: 10.1039/C5RA25657G Bibcode: 2016RSCAd...6.7391C