Citation: WANG Lin-Xiang. Preparation and Luminescence Properties of CaWO₄:xEu³⁺, ySm³⁺, zLi⁺ Red Phosphors[J]. Chinese Journal of Inorganic Chemistry, ;2017, 33(10): 1741-1747. doi: 10.11862/CJIC.2017.213 shu

Preparation and Luminescence Properties of CaWO₄:xEu³⁺, ySm³⁺, zLi⁺ Red Phosphors

WANG Lin-Xiang ^1,2,,

1.
College of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, China
2.
Key Laboratory of Novel Luminescent Materials and Nanostructures, Xinjiang Normal University, Urumqi 830054, China

Corresponding author: WANG Lin-Xiang, wanglinxiang23@126.com
Received Date: 28 March 2017
Revised Date: 15 May 2017

Figures(5)

CaWO₄:xEu³⁺, ySm³⁺, zLi⁺ red phosphors were prepared by the microwave solid state method. The XRD was used to analyze the microstructures of samples. The excitation spectra, emission spectra and luminescence decay curves of the samples were measured. The influences of the concentration of Sm³⁺, Eu³⁺, Li⁺ on the microstructure, luminescence properties, energy transfer, fluorescence decay and energy level lifetime for synthesized samples were researched. The results show that the doping of Eu³⁺, Sm³⁺ or Li⁺ can not cause the change of the crystalline phase of the synthesized powders, which is still single tetragonal structure of CaWO₄. For Eu³⁺ and Sm³⁺ co-doped samples, when the doping concentration of Sm³⁺ was 3%, and the energy transfer from Sm³⁺ to Eu³⁺ was the most effective. The doped Li⁺ acted as a flux and sensitizer, which improved the luminescent intensity of the sample. At the excitation wavelength 394 nm, compared with Eu³⁺ single doped CaWO₄, the luminescence of 3%Eu³⁺, 3%Sm³⁺ co-doped CaWO₄ and 3%Eu³⁺, 3%Sm³⁺, 1%Li⁺ co-doped CaWO₄ increased by 2 times and 2.4 times respectively. At the same excitation wavelength, Eu³⁺ single doped samples had the shortest lifestime. With the increase of Sm³⁺ concentration, the lifetime of Eu³⁺, Sm³⁺ co-doped samples first decreased and then increased. The ⁵D₀ energy level lifetime of the sample doped with Li⁺ increased compared the sample without Li⁺.
- microwave solid state method,
- CaWO₄:xEu³⁺, ySm³⁺, zLi⁺,
- energy transfer,
- luminescence intensity,
- energy level lifetime
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沈阳化工大学材料科学与工程学院沈阳 110142

Preparation and Luminescence Properties of CaWO4:xEu3+, ySm3+, zLi+ Red Phosphors

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Preparation and Luminescence Properties of CaWO₄:xEu³⁺, ySm³⁺, zLi⁺ Red Phosphors