Ultraviolet to near-infrared energy transfer in NaYF₄:Nd³⁺,Yb³⁺ crystals

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• 作者：Xiaobin DONG (董晓斌) ; Fangtian YOU (由芳田) ; ^{ftyou@bjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Hongshang PENG (彭洪尚) ; Shihua HUANG (黄世华)
• 关键词：energy transfer ; rare earth ions ; NIR ; NaYF4
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：34
• 期：9
• 页码：863-867
• 全文大小：1067 K

文摘

To convert ultraviolet (UV) light into near-infrared (NIR) light in phosphors is demanded for the development of solar cells. A series of NaYF₄:Nd³⁺,Yb³⁺ white powder samples were prepared via the hydrothermal method. The crystal structure and photoluminescence properties of the samples were carefully studied using X-ray diffractometry (XRD) and photoluminescence spectra. The excitation and emission spectra of NaYF₄:Nd³⁺,Yb³⁺ samples and the luminescence decay curves of Nd³⁺ and Yb³⁺ revealed an efficient energy transfer process from Nd³⁺ to Yb³⁺. This process resulted in the Yb³⁺ NIR fluorescent emission at 980 nm. Moreover, the lifetime of the Nd³⁺⁴F_3/2 level decreased with the increase of Yb³⁺ doping concentration. The build-up time of the decay curves of the Yb³⁺²F_5/2 level further verified the energy transfer process. Meanwhile, energy transfer efficiency based on different Yb³⁺ doping concentrations was achieved.