Remarkable differences in photoluminescent properties between LaPO4:Eu one-dimensional nanowires and zero-dimensional nanoparticles

Hongwei Song; Lixin Yu; Shaozhe Lu; Tie Wang; Zhongxin Liu; Linmei Yang
July 2004
Applied Physics Letters;7/19/2004, Vol. 85 Issue 3, p470
Academic Journal
Photoluminescent properties of zero-dimensional LaPO4: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 Eu3+ occupied only one site, A, while in NW Eu3+ occupied the same site, A and an additional site B due to crystal anisotropy. Furthermore, the electronic transition rate of 5D1–∑J7FJ in the NW increased from 14.9 to 28.9 ms-1 compared to the NP, while the nonradiative transition rate of 5D1–5D0 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.


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