Design and synthesis of biodegradable nonconjugated SSPAMAM dendrimers with unexpected Deep-red/NIR emission and cell membrane targeting ability for biological imaging oleh Xiao-lin Guan, Xue-qin Yang, Shou-jun Lai, Yuan-yuan Ding, Jing-yu Wei, Jia-ming Zhang, Li-yuan Zhang, Cheng-hao Li, Jin-hui Tong, Zi-qiang Lei