Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 33, Issue 29, Pages 23042-23053Publisher
SPRINGER
DOI: 10.1007/s10854-022-09071-2
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Funding
- Open Funding of Technology Research Center of Hunan Province for Comprehensive Utilization of Associated Fluorite and Fluorine Chemical Engineering [CF-SZX2021006]
- Natural Science Foundation of Shaanxi Province [2022NY-224]
- Undergraduate Innovation Fund of Northwest A&F University, China [202210712058, 202210712050, S202210712394, 202110712190, 202110712188, S202110712707]
- National Natural Science Foundation of China [11804265]
- Home for researchers, China
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A series of novel trivalent dysprosium activated La5NbMo2O16 phosphors were successfully prepared via solid-state reaction, exhibiting excellent luminescence properties with dominant blue, yellow, and red emissions. The optimal sample, La5NbMo2O16:10 mol%Dy3+ phosphor, showed high thermostability and good activation energy, making it suitable for white light-emitting diode applications.
In order to develop new phosphors, a series of novel trivalent dysprosium (Dy3+) activated single-phase yellow-emitting La5NbMo2O16 phosphors were firstly prepared through the high-temperature solid-state reaction method. Powder X-ray diffraction (XRD) patterns were measured to check the crystalline structure of La5NbMo2O16 phosphors. The photoluminescence (PL) spectra were used to characterize the luminescence properties of the prepared La5NbMo2O16:Dy3+ phosphors. Under 386 nm excitation, the PL spectra of La5NbMo2O16:Dy3+ phosphors mainly contain three dominant sharp peaks at blue (486 nm), yellow (574 nm), and red emission (669 nm), respectively. The intense peak at 574 nm attributes to the typical F-4(9/2)-H-6(13/2) transition of Dy3+ ions. The optimal sample is La5NbMo2O16:10 mol%Dy3+ phosphor with the estimated R-c = 18.89 angstrom. The obtained La(5)NbMo(2)O(16)10 mol%Dy3+ product shows high thermostability with high quenching temperature (above 480 K) and good activation energy (E-a = 0.32 eV). Besides, the CIE chromaticity coordinate (0.442, 0.474) of the La5NbMo2O16:10 mol%Dy3+ phosphor is in the yellow region. A white light-emitting diode (w-LED) with the chromaticity coordinates of (0.322, 0.335), a correlated color temperature (CCT) of 5974 K, and a color rendering index (R-a) of 90 was successfully fabricated. All results indicate that La5NbMo2O16:Dy3+ phosphors have extensive application prospects for w-LEDs.
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