Up-Conversion Emissions of Tm3+ and Gd3+ in K-Lu-Gd-Yb-F Nano/Microcrystals

作者：Cao, Chunyan^*

来源：Nanoscience and Nanotechnology Letters, 2016, 8(9): 755-759.

DOI：10.1166/nnl.2016.2215

• Optical Materials
• Chemical Synthesis
• Photoluminescence Spectroscopy
• Optical Properties

By using a hydrothermal method, 0.5 mol% Tm3+ and 20 mol% Yb3+-doped K-Lu-Gd-F samples with different Gd3+ introduction have been synthesized. With the increase of Gd3+ concentration, the sample crystalline phases evolved from the orthorhombic phase of KLu(Gd)(2)F-7 to the cubic phase of KGd(Lu)F-4. The Gd3+ introduction also has great effects on the morphologies of the samples. Under 980 nm excitation, up-conversion (UC) emission of Tm3+, as well as Gd3+ in the wavelength range of 250 nm to 850 nm, were recorded. The UC emission intensities of Tm3+ and Gd3+ increased with the pumping power increasing. Under the same measurement conditions, the UC emission intensity of Gd3+ first increased and reached the maximum when Gd3+ concentration was 20 mol%. Then the UC emission intensity decreased with the Gd3+ concentration increasing further, which was supposed to be adjusted by energy transfer efficiency from Tm3+ to Gd3+, energy migration among Gd3+, and crystalline phases of samples.

• 出版日期2016-9
• 单位厦门理工学院