Angew. Chem. Int. Ed. 2012, 51, 3125 –3129

In Vitro and In Vivo Uncaging and Bioluminescence Imaging by Using Photocaged Upconversion Nanoparticles** Yanmei Yang, Qing Shao, Renren Deng, Chao Wang, Xue Teng, Kai Cheng, Zhen Cheng, Ling Huang, Zhuang Liu, Xiaogang Liu,* and Bengang Xing*