scholarly journals Controlled Synthesis of Tb3+/Eu3+ Co-Doped Gd2O3 Phosphors with Enhanced Red Emission

Molecules ◽  
2019 ◽  
Vol 24 (4) ◽  
pp. 759 ◽  
Author(s):  
Dong Zhu ◽  
Jinkai Li ◽  
Xiangyang Guo ◽  
Qinggang Li ◽  
Hao Wu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Emission Intensity ◽  
Phase Variation ◽  
Hydrothermal Condition ◽  
Luminescent Properties ◽  
Excitation Wavelength ◽  
Controlled Synthesis ◽  
Energy Transfer Mechanism ◽  
Hydrothermal Conditions ◽  
Controlled Morphology

(Gd0.93−xTb0.07Eux)2O3 (x = 0–0.10) phosphors shows great potential for applications in the lighting and display areas. (Gd0.93−xTb0.07Eux)2O3 phosphors with controlled morphology were prepared by a hydrothermal method, followed by calcination at 1100 °C. XRD, FE-SEM, PL/PLE, luminescent decay analysis and thermal stability have been performed to investigate the Eu3+ content and the effects of hydrothermal conditions on the phase variation, microstructure, luminescent properties and energy transfer. Optimum excitation wavelength at ~308 nm nanometer ascribed to the 4f8-4f75d1 transition of Tb3+, the (Gd0.93−xTb0.07Eux)2O3 phosphors display both Tb3+and Eu3+ emission with the strongest emission band at ~611 nm. For increasing Eu3+ content, the Eu3+ emission intensity increased as well while the Tb3+ emission intensity decreased owing to Tb3+→Eu3+ energy transfer. The energy transfer efficiencies were calculated and the energy transfer mechanism was discussed in detail. The lifetime for both the Eu3+ and Tb3+ emission decreases with the Eu3+ addition, the former is due to the formation of resonant energy transfer net, and the latter is because of contribution by Tb3+→Eu3+ energy transfer. The phosphor morphology can be controlled by adjusting the hydrothermal condition (reaction pH), and the morphological influence to the luminescent properties (PL/PLE, decay lifetime, etc.) has been studied in detail.

Controlled synthesis and luminescent properties of assembled spherical YPxV1−xO4:Ln3+ (Ln = Eu, Sm, Dy or Tm) phosphors with high quantum efficiency

RSC Advances ◽  
2015 ◽  
Vol 5 (65) ◽  
pp. 52533-52542 ◽  
Author(s):  
Zhibin An ◽  
Xiuzhen Xiao ◽  
Jun Yu ◽  
Dongsen Mao ◽  
Guanzhong Lu
Keyword(s):  
Energy Transfer ◽  
Hydrothermal Method ◽  
Quantum Efficiency ◽  
Luminescent Properties ◽  
Controlled Synthesis ◽  
High Quantum Efficiency ◽  
High Quantum ◽  
Controlled Morphology

Controlled morphology and energy transfer in assembled spherical YPxV1−xO4:Ln3+ (Ln = Eu, Sm, Dy or Tm) phosphors with higher luminescent quantum efficiency by the EDTA-assisted hydrothermal method.

scholarly journals Luminescent Properties and Energy Transfer Mechanism of Gd3+ and Eu2+ Co-doped Phosphate Glasses

2015 ◽  
Vol 28 (4) ◽  
pp. 487-491 ◽  
Author(s):  
Qian Wang ◽  
Shao-Ye Ouyang ◽  
Wei-Huan Zhang ◽  
Bin Yang ◽  
Yue-Pin Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Luminescent Properties ◽  
Phosphate Glasses ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Co Doped

scholarly journals Enhancing the Relative Sensitivity of V5+, V4+ and V3+ Based Luminescent Thermometer by the Optimization of the Stoichiometry of Y3Al5−xGaxO12 Nanocrystals

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1375 ◽  
Author(s):  
Kniec ◽  
Ledwa ◽  
Marciniak
Keyword(s):  
Energy Transfer ◽  
Emission Intensity ◽  
Spectral Response ◽  
Luminescent Properties ◽  
Relative Sensitivity ◽  
Temperature Sensing ◽  
Thermal Dependence ◽  
Temperature Range

In this work the influence of the Ga3+ concentration on the luminescent properties and the abilities of the Y3Al5−xGaxO12: V nanocrystals to noncontact temperature sensing were investigated. It was shown that the increase of the Ga3+ amount enables enhancement of V4+ emission intensity in respect to the V3+ and V5+ and thus modify the color of emission. The introduction of Ga3+ ions provides the appearance of the crystallographic sites, suitable for V4+ occupation. Consequently, the increase of V4+ amount facilitates V5+ → V4+ interionic energy transfer throughout the shortening of the distance between interacting ions. The opposite thermal dependence of V4+ and V5+ emission intensities enables to create the bandshape luminescent thermometr of the highest relative sensitivity of V-based luminescent thermometers reported up to date (Smax, 2.64%/°C, for Y3Al2Ga3O12 at 0 °C). An approach of tuning the performance of Y3Al5−xGaxO12: V nanocrystals to luminescent temperature sensing, including the spectral response, maximal relative sensitivity and usable temperature range, by the Ga3+ doping was presented and discussed.

Luminescent properties and energy transfer mechanism from Tb3+ to Eu3+ doped in Y3Al5O12 phosphors

2020 ◽  
Vol 822 ◽  
pp. 153651 ◽  
Author(s):  
Wellisson S. Silveira ◽  
Patresio A.M. Nascimento ◽  
Ariosvaldo J.S. Silva ◽  
Marcos V.dos S. Rezende
Keyword(s):  
Energy Transfer ◽  
Luminescent Properties ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism

scholarly journals The Luminescence Properties and Energy Transfer from Ce3+to Pr3+for YAG:Ce3+Pr3+Phosphors

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Rongfeng Guan ◽  
Liu Cao ◽  
Yajun You ◽  
Yuebin Cao
Keyword(s):  
Energy Transfer ◽  
Emission Intensity ◽  
Electronic Excitation ◽  
Light Emission ◽  
Red Light ◽  
Luminescent Properties ◽  
Concentration Increase ◽  
Transfer Phenomenon ◽  
Colour Rendering ◽  
Light Emission Intensity

Y2.94−xAl5O12(YAG):Ce0.06Prxphosphors with various Pr3+concentrations (x=0, 0.006, 0.01, 0.03, 0.06, and 0.09) were synthesized by using a coprecipitation method. The phases, luminescent properties, and energy transfer phenomenon from Ce3+to Pr3+were investigated. The results indicated that the doping of Pr3+  (x≤0.09)did not produce any new phases but caused a slight lattice parameters increase. After Pr3+doping, the YAG:CePr phosphor emits red light at 610 nm, which was regarded helpful for improving the colour rendering index of the phosphor. With Pr3+concentration increase from 0.006 to 0.01 mol, the intensity of red light emission increased slightly; further increasing Pr3+concentration from 0.01 to 0.09, the red light emission intensity decreased gradually. Excitation at 340, and 460 nm could not lead to the direct electronic excitation of Pr3+ions; however, when YAG:CePr was excited at 340 nm a red light emission at 610 nm appeared, which implied the energy transfer phenomenon from Ce3+to Pr3+.

Controlled synthesis, photoluminescence, and the quantum cutting mechanism of Eu3+ doped NaYbF4 nanotubes

2014 ◽  
Vol 16 (26) ◽  
pp. 13440-13446 ◽  
Author(s):  
Xiangfu Wang ◽  
Chun-sheng Liu ◽  
Tonghui Yu ◽  
Xiaohong Yan
Keyword(s):  
Energy Transfer ◽  
Transfer Mechanism ◽  
Controlled Synthesis ◽  
Energy Transfer Mechanism ◽  
Improved Method ◽  
Cutting Mechanism ◽  
Quantum Cutting ◽  
Down Conversion

Eu3+ doped NaYbF4 nanotubes show quantum cutting down-conversion under 393 nm excitation. An improved method is proposed to calculate Judd–Ofelt parameters and to study the energy transfer mechanism.

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