Yb 3+/Tb 3+/Er 3+-doped transparent alkaline earth fluorosilicate glass ceramics containing SrF 2 nanocrystals were prepared and their microstructures and spectroscopic properties were investigated. The formation of SrF 2 nanocrystals enriched with Yb 3+/Tb 3+/Er 3+ in the glass ceramics was confirmed by XRD, HRTEM and SAED. The glass ceramics exhibited intense upconversion luminescence behaviors, owing to efficient energy transfers from Yb 3+ to Er 3+ and Tb 3+ and low phonon assistant non-radiative transition probabilities of excited Er 3+ and Tb 3+. The upconversion could be enhanced significantly by increasing the annealing temperature and the luminescence color could be adjusted by varying the Yb 3+/Tb 3+/Er 3+ ratio. Upconversion of Er 3+ could be described as sequential energy transfer from single Yb 3+ to single Er 3+, while upconversion of Tb 3+ described as cooperative energy transfer from double Yb 3+ to single Tb 3+.