Near infrared fluorescence and energy transfer in Ce/Nd Co-doped CaxSr1-xS

作者：Meng, Jian-Xin^*; Wan, Wen-Jiao; Fan, Li-Li; Yang, Chuang-Tao; Chen, Qing-Qing; Cao, Li-Wei; Man, Shi-Qing

来源：Journal of Luminescence, 2011, 131(1): 134-137.

DOI：10.1016/j.jlumin.2010.09.038

• Near infrared
• Energy transfer
• Fluorescence lifetime

Novel near infrared (NIR) phosphors CaxS1-xS Ce3+ Nd3+ were synthesized by a solid state reaction The NIR emission was realized through an efficient absorption by the allowed 4f-5d transition of Ce3+ and efficient energy transfer to Nd3+ via well-matched energy levels Ce3+ and Nd3+ content in CaS/SrS was optimized It was found that CaS Ce3+ Nd3+ gave much stronger NIR emission than that of SrS Ce3+ Nd3+ Further studies on CaxS1-xS Ce3+ Nd3+ indicated that both visible emission of Ce3+ and NIR emission of Nd3+. were observably affected by Ca/Sr ratio The energy transfer efficiency which can be estimated from fluorescence lifetime of Ce3+. increased from 52% to 74% for the CaxS1-xS Ce3+ Nd3+ (x=0 to 1) senes accompanied with a shift of maximal emission wavelength of Ce3+ from 482 to 505 nm The results showed that overlap between emission spectrum of Ce3+ and excitation spectrum of Nd3+ plays an important role in the energy

• 出版日期2011-1
• 单位暨南大学