Journal
JOURNAL OF LUMINESCENCE
Volume 197, Issue -, Pages 219-227Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.01.046
Keywords
Luminescence; NaLa(WO4)(2):Sm phosphors; Hydrothermal method; Energy transfer
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Funding
- National outstanding youth fund of Nature Science of China [51045216]
- Nature Science of Inner Mongolia autonomous region, China [2017MS(LH)0208]
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Synthesize a series of NaLa(WO4)(2):Sm phosphors in different pH and Sm3+ mole contents by using the hydrothermal method. Analyze and characterize the crystal structure, morphological structure, luminescence property, quantum efficiency and chromaticity coordinates of the sample by means of X-ray diffractometer (XRD), scanning electron microscope (SEM and EDS), fluorospectro photometer (FL), Fourier transform infrared spectrometer (FI-IR) and HORIBA Fluoromax-4 fluorescence spectrometer. The analysis results show that all the products obtained are in the scheelite-type structure of tetragonal system, and the morphological structure of them is a sphere or spheroidicity composed of nanoflakes. The product excites at 403 nm NUV, the emission spectrum has 4 emission peaks which are located at 568 nm, 605 nm, 647 nm and 707 nm respectively and belong to (4)G(5/2)-> H-6(J/2) (J = 5, 7, 9, 11) transition of Sm3+. The luminescence intensity of the product increases and then decreases with the increase of Sm3+ mole content; when the Sm3+ mole content is 2 similar to 3%, the fluorescence intensity reaches the maximum value and the strongest peak is located at 647 nm; when the Sm3+ mole content is more than 3%, the concentration quenching occurs. The analysis determines the electric dipole-electric dipole interaction as the type of energy transfer between samarium ions, and the critical distance of energy transfer is 2.196-2.514 nm. The quantum efficiency of the best product is 34.47%, and the chromaticity coordinates show that NaLa(WO4)(2):Sm phosphor is orange red and can be used as the potential orange red phosphor for LED.
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