Remarkable differences in photoluminescent properties between LaPO_(4):Eu one-dimensional nanowires and zero-dimensional nanoparticles

摘要

Photoluminescent properties of zero-dimensional LaPO_(4):Eu nanoparticles (NPs) and one-dimensional nanowires (NWs) prepared by the same wet-chemical synthesis technique were studied and compared. The results indicate that in NP Eu~(3+) occupied only one site, A, while in NW Eu~(3+) occupied the same site, A and an additional site B due to crystal anisotropy. Furthermore, the electronic transition rate of ~(5)D_(1)-Σ_(J) ~(7)F_(J) in the NW increased from 14.9 to 28.9 ms~(-1) compared to the NP, while the nonradiative transition rate of ~(5)D_(1)-~(5)D_(0) decreased from 24.1 to 19.7 ms~(-1). The luminescent quantum efficiency thus improved from 30% to 59%. This work demonstrates that a one-dimensional NW may be a more favorable device than a zero-dimensional NP for photoluminescence.