Doping Eu3+/Sm3+ into CaWO4:Tm3+, Dy3+ phosphors and their luminescence properties, tunable color and energy transfer

RSC Advances ◽  
2016 ◽  
Vol 6 (31) ◽  
pp. 26239-26246 ◽  
Author(s):  
Wei Xie ◽  
Guixia Liu ◽  
Xiangting Dong ◽  
Jinxian Wang ◽  
Wensheng Yu
Keyword(s):  
Energy Transfer ◽  
Hydrothermal Method ◽  
White Light ◽  
Luminescence Properties ◽  
Warm White Light ◽  
Co Doped

Eu3+ and Sm3+ co-doped CaWO4:Tm3+, Dy3+ phosphors were prepared by a hydrothermal method. Under different UV radiations, the tunable color and warm-white-light emissions are realized.

Realization of warm white light and energy transfer studies of Dy3+/Eu3+ co-doped Li2O-PbO-Al2O3-B2O3 glasses for lighting applications

2020 ◽  
Vol 222 ◽  
pp. 117166 ◽  
Author(s):  
Nisha Deopa ◽  
Mukesh K. Sahu ◽  
P.R. Rani ◽  
R. Punia ◽  
A.S. Rao
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Warm White Light ◽  
Co Doped

Tunable color and energy transfer of Tm3+ and Ho3+ co-doped NaGdF4 nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 50611-50616 ◽  
Author(s):  
Hongxia Guan ◽  
Guixia Liu ◽  
Jinxian Wang ◽  
Xiangting Dong ◽  
Wensheng Yu
Keyword(s):  
Energy Transfer ◽  
Hydrothermal Method ◽  
Luminescence Properties ◽  
Light Blue ◽  
Bluish Green ◽  
Co Doped

NaGdF4:Tm3+, Ho3+ nanoparticles with luminescence properties were synthesized by a hydrothermal method. The hues could be tuned from blue through to light blue and ultimately to bluish green.

Luminescence properties, energy transfer and multisite luminescence of Bi3+/Sm3+/Eu3+-coactivated Ca20Al26Mg3Si3O68 as a potential phosphor for white-light LEDs

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 89984-89993 ◽  
Author(s):  
Chengyi Xu ◽  
Ye Sheng ◽  
Bo Yuan ◽  
Hongxia Guan ◽  
Pingchuan Ma ◽  
...  
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Luminescence Properties ◽  
Warm White Light

The emission hue can be tuned from cool white to white, and finally to warm white light due to the energy transfer from Bi3+ ions to Sm3+ ions. Simultaneously, two kinds of sites for cations (Ca2+) in the host were considered.

scholarly journals High Thermal Stability Apatite Phosphors Ca2La8(SiO4)6O2:Dy3+/Sm3+ for White Light Emission: Synthesis, Structure, Luminescence Properties and Energy Transfer

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ning Liu ◽  
Lefu Mei ◽  
Libing Liao ◽  
Jie Fu ◽  
Dan Yang
Keyword(s):  
Thermal Stability ◽  
Energy Transfer ◽  
White Light ◽  
Single Phase ◽  
Light Emission ◽  
High Thermal Stability ◽  
White Light Emission ◽  
Luminescence Properties ◽  
Potential Candidate ◽  
Co Doped

Abstract What ideal w-LED phosphors always aim to do is to achieve a single phase near-sunlight emission phosphor simultaneously with both high luminescence efficiency and high thermal stability at operation temperature. And It is well known that apatite compound phosphors are one of the most promising optical materials to realize those above because of their unique structure enhanced luminescence properties and thermal stability. Here, we synthesized a co-doped single phase apatite phosphors Ca2La8(SiO4)6O2:Dy3+/Sm3+ (CLSO:Dy3+/Sm3+) for white light emission, which was provided with excellent thermal stability and of which luminescence intensity at 150 °C still was 92 percentage of that at room temperature. Moreover, X-ray diffraction technique, Fourier transform infrared spectroscopy, scanning electron microscope were employed to characterization of phase structure and morphology, and consequently pure apatite structure and gravel-like morphology of phosphors were proved. Analysis of photoluminescence spectra indicated that concentration quenching effect exist in single-doped CLSO:Dy3+ phosphors owing to dipole-dipole interaction between Dy3+ ions. It is revealed that maybe exist Dy3+ ↔ Sm3+ bilateral non-radiative energy transfer processes in Dy3+/Sm3+ co-doped CLSO system by PL spectra and decay curves. And variation of Sm3+ ion concentration can control color emission, namely CIE chromaticity coordinates and correlated color temperature, finally to achieve white light emission (0.309,0.309) with CCT 6848 K, able to be a potential candidate for commercial lighting applications.

scholarly journals Warm-white luminescence of Dy3+ and Sm3+ co-doped NaSrPO4 phosphors through energy transfer between Dy3+ and Sm3+ ions

2021 ◽  
Author(s):  
Wen Yan ◽  
Junhan Li ◽  
Wentao Zhang ◽  
Xi Gao ◽  
Peicong Zhang
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Sol Gel ◽  
Synthesis Temperature ◽  
Dipole Transition ◽  
Efficient Energy Transfer ◽  
Light Emitting ◽  
Co Doping ◽  
Warm White Light ◽  
Co Doped

Abstract Series of white-light-emitting NaSrPO4:Dy3+ phosphors were synthesized via a sol-gel method. Small amounts of Sm3+ ions were co-doped into the phosphors to enhance their luminescence. The effects of Dy3+/Sm3+ co-doping concentrations and synthesis temperature on the phosphors’ structures and luminescence properties were investigated. The results of X-ray diffraction confirmed that the characteristic diffraction peaks of the phosphors were in accord with those of the standard NaSrPO4 structure. Energy dispersive spectroscopy indicated that the NaSrPO4:Dy3+ samples were prepared with stoichiometric ratios of elements. Under ultraviolet light excitation of 348 nm, the NaSrPO4:Dy3+ phosphors emitted a white light which was composed of two emission peaks at 484 nm (blue) and 577 nm (yellow) corresponding to the magnetic dipole transition 4F9/2 → 6H15/2 and electronic dipole transition 4F9/2 → 6H13/2 of Dy3+ ions, respectively. Based on Sm3+ co-doping, a characteristic red emission at 602 nm arose and a warm-white light containing a lower CCT value was obtained. Besides, the luminescence lifetime of Dy3+ decreased while that of Sm3+ increased as dosages of Sm3+ were added, indicating efficient energy transfer from Dy3+ to Sm3+ happened. Therefore, NaSrPO4:Dy3+, Sm3+ phosphors are promising candidates for application in warm-white light-emitting diodes.

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