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Research articles

ScienceAsia 46 (2020): 46-51 |doi: 10.2306/scienceasia1513-1874.2020.002


Yb3+/Er3+ concentration dependent microstructure evolution and green/red emissions of NaYF4:Yb/Er phosphors


Yanli Dinga,b,*, Tonghui Yanga, Naiqiang Yina, Peng Lia, Ying Zhaob, Xiaodan Zhangb

 
ABSTRACT:     Photon upconversion is promising for applications such as data storage, drug delivery and solar cells. β-NaYF4:Yb/Er samples were synthesized by a facile hydrothermal method. The effects of Yb/Er ratio on the microstructures, morphology evolution and luminescence properties were studied. The SEM results showed that the morphology of the samples evolved gradually from plate to prismatic structure with an increase in Yb3+ concentration. This indicates that the growth rate along the c-axis crystal planes of NaYbF4 lattices is more rapid than NaYF4 lattices. Photoluminescence measurements demonstrate that the bright multicolored upconversion emissions can be fine-tuned from green to red by adjusting the codoped Yb/Er ratio under 980 nm laser excitation. The tunable emission is due to the energy back transfer from Yb3+ to Er3+. Applying this material in perovskite solar cell, a current density of 4 µA cm−2 is obtained under 40 mW and 980 nm laser excitation.

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a School of Electrical and Electronic Engineering, Shangqiu Normal University, Shangqiu 476000 China
b Institute of Photo-electronic Thin Film Devices and Technology, Nankai University, Tianjin 300071 China

* Corresponding author, E-mail: yanliding2006@163.com

Received 16 Feb 2019, Accepted 22 Dec 2019