scholarly journals Novel Tunable Green-Red Luminescence in Mn2+ Doped Ca9Tb(PO4)7 Phosphors Based on the Mn2+ Regulation and Energy Transfer

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 952
Author(s):  
Bingwen Yang ◽  
Yefeng Feng ◽  
Qinghu Zhao ◽  
Miao He ◽  
Yang Lv
Keyword(s):  
Energy Transfer ◽  
Green Emission ◽  
Energy Transfer Mechanism ◽  
Red Emission ◽  
Broadband Emission ◽  
Characteristic Emission ◽  
Potential Applications ◽  
Light Excitation ◽  
Red Luminescence ◽  
Thermal Stability Of

β-Ca3(PO4)2 type phosphors Ca9Tb(PO4)7:Mn2+ were fabricated by high temperature solid state reaction. Under 377 nm light excitation, the Ca9Tb(PO4)7 host displays the green emission attributable to the characteristic emission of Tb3+ ions peaking at 488, 542, 586, and 620 nm, respectively. The red broadband emission is observed when Ca9Tb(PO4)7 is doped with Mn2+ ions. The emission is attributed to the energy transfer from Tb3+ to Mn2+ ions; this facilitates the realization of the tunable green–red emission. The energy transfer mechanism from Tb3+ to Mn2+ is defined as quadrupole–quadrupole interaction. Furthermore, the thermal stability of Ca9Tb(PO4)7:Mn2+ samples has been studied, and it can maintain half the emission intensity exceeding 424 K. This demonstrates their potential applications in white light LEDs (w-LEDs).

A rate equation model for the energy transfer mechanism of a novel multi-color-emissive phosphor, Ca1.624Sr0.376Si5O3N6:Eu2+

2019 ◽  
Vol 6 (12) ◽  
pp. 3493-3500
Author(s):  
Jin Hee Lee ◽  
Satendra Pal Singh ◽  
Minseuk Kim ◽  
Myoungho Pyo ◽  
Woon Bae Park ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rate Equation ◽  
Equation Model ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Rate Equation Model ◽  
Broadband Emission

A novel multi-color-emissive phosphor (Ca1.624Sr0.376Si5O3N6:Eu2+) and a rate equation model to elucidate the mechanism of energy-transfer leading to broadband emission.

Investigation of luminescence properties and the energy transfer mechanism of Li6Lu(BO3)3:Ce3+, Tb3+ green-emitting phosphors

RSC Advances ◽  
2015 ◽  
Vol 5 (8) ◽  
pp. 5591-5597 ◽  
Author(s):  
Irish Valerie B. Maggay ◽  
Pin-Chun Lin ◽  
Wei-Ren Liu
Keyword(s):  
Energy Transfer ◽  
Green Emission ◽  
Transfer Mechanism ◽  
Luminescence Properties ◽  
Energy Transfer Mechanism ◽  
Uv Led

Novel green-emitting phosphor – Li6Lu(BO3)3:Ce3+, Tb3+ phosphors exhibit intense green emission via the energy transfer from Ce3+ to Tb3+. The data demonstrated that the phosphor is a promising green-emitting phosphor for UV LED applications.

scholarly journals Tunable emission from green to red in the GdSr2AlO5:Tb3+,Eu3+ phosphor via efficient energy transfer

RSC Advances ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 3530-3535 ◽  
Author(s):  
Yu Zhang ◽  
Xuejie Zhang ◽  
Haoran Zhang ◽  
Lingling Zheng ◽  
Yuan Zeng ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Emission Spectra ◽  
Green Emission ◽  
Efficient Energy Transfer ◽  
Red Emission ◽  
Efficient Energy ◽  
Tunable Emission ◽  
Variation Tendency

The emission spectra of GdSr2AlO5:2%Tb3+,x%Eu3+ (x = 0, 0.5, 1, 2, 3, and 5) under 275 nm excitation. (b) Variation tendency of the green emission of Tb3+ and the red emission of Eu3+.

REMO4 (RE = Y, Gd; M = Nb, Ta) phosphors from hybrid precursors: Microstructure and luminescence

2008 ◽  
Vol 23 (3) ◽  
pp. 679-687 ◽  
Author(s):  
Xiuzhen Xiao ◽  
Bing Yan
Keyword(s):  
Energy Transfer ◽  
Transfer Process ◽  
Energy Transfer Process ◽  
Luminescent Properties ◽  
Concentration Quenching ◽  
Emission Lines ◽  
Rare Earth Ion ◽  
Red Emission ◽  
Characteristic Emission

In this paper, YNbO4:0.05Tb3+ and GdTaO4:0.05Eu3+ phosphors were chosen to study the influence of the firing temperature on the phase and morphologies using novel modified in situ chemical coprecipitation technology. Results show that until the temperature reaches 1000 °C, the formation of YNbO4 and GdTaO4 were realized; with the increasing firing temperatures, those samples present better crystalline structure and better morphologies. The luminescent properties of Eu3+ and Tb3+ have shown that after calcinations at 1000 °C, the intensity of Eu3+ and Tb3+ increases strongly with the increasing of the calcinations temperature, while remaining relatively unchanged at the temperatures ranging between 600 and 800 °C. Furthermore, other rare earth ion doped GdTaO4 and Y1−xGdxTaO4:5 mol% Eu3+ with the different yttrium content were also synthesized after calcinating at the preferable temperature using the same method. The photoluminescence of Y1−xGdxTaO4:5 mol% Eu3+ revealed that the red emission intensity of Eu3+ increases with the increasing of gadolinium content, indicating that Gd ion plays an important role in the energy transfer process. Also, the concentration quenching has been studied in the GdTaO4:Eu3+/Dy3+ systems. Moreover, the characteristic emission lines of Tb3+, Pr3+, and Er3+ in GdTaO4 were observed, showing that the energy transfer process appears between host and those activators.

scholarly journals Tunable Yellow-Red Emission via Energy Transfer in Dy3+, Mn4+: NaLaMgWO6 Phosphors for UV-Excited LED

2021 ◽  
Author(s):  
yonghua wu ◽  
Fugui Yang ◽  
Fengpo Yan ◽  
Ruijuan Zuo
Keyword(s):  
Energy Transfer ◽  
Solid State ◽  
Solid State Reaction ◽  
Red Light ◽  
Emission Spectra ◽  
Excitation Source ◽  
Red Emission ◽  
Phase Purity ◽  
Emission Performance ◽  
Light Excitation

Abstract The Dy3+, Mn4+: NaLaMgWO6 phosphors are synthesized successfully using the technique of solid-state reaction at 1150 ℃. The XRD and SEM-EDS are measured to analyze the phase purity. The concentrations of Dy3+, Mn4+, Mg2+, Na+, La3+ and W6+ are measured by ICP. The absorption and excited spectra are presented, which indicate the 390 nm is suitable for the tunable yellow-red light excitation. Using the 390 nm LED as the excitation source, the emission spectra with different doped concentrations ratios of Dy3+to Mn4+ are obtained, which shows good tunable yellow-red emission performance.

Tunable blue-green emission and energy transfer properties in β-Ca3(PO4)2:Eu2+, Tb3+ phosphors with high quantum efficiencies for UV-LEDs

2015 ◽  
Vol 44 (10) ◽  
pp. 4683-4692 ◽  
Author(s):  
Kai Li ◽  
Yang Zhang ◽  
Xuejiao Li ◽  
Mengmeng Shang ◽  
Hongzhou Lian ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Concentration Ratio ◽  
Green Emission ◽  
High Quantum ◽  
Emission Color ◽  
Potential Applications ◽  
Uv Leds ◽  
Transfer Properties ◽  
Co Doped ◽  
The Eu

A series of Eu2+ and Tb3+ singly-doped and co-doped β-Ca3(PO4)2 phosphors have been synthesized. The emission color can be tuned from blue to green by adjusting the Eu2+/Tb3+ concentration ratio, showing their potential applications in UV-pumped wLEDs.

scholarly journals Preparation and characterization of a gadolinium compound with high thermal stability

2021 ◽  
Vol 34 (3) ◽  
pp. 479-488 ◽  
Author(s):  
W. T. Chen
Keyword(s):  
Thermal Stability ◽  
Energy Transfer ◽  
Solid State ◽  
Three Dimensional ◽  
Blue Emission ◽  
Energy Transfer Mechanism ◽  
Blue Emission Band ◽  
Characteristic Emission ◽  
Pyridinedicarboxylic Acid ◽  
Cie Chromaticity

A new lanthanide compound [Gd(2,5-HPA)(2,5-PA)]n (1; 2,5-H2PA = 2,5-pyridinedicarboxylic acid) was obtained through hydrothermal reactions and structurally characterized by single-crystal X-ray diffraction. It possesses a three-dimensional (3-D) framework structure. Solid-state photoluminescence experiment revealed that it shows dark blue emission band, which can be assigned to the characteristic emission of the 4f electron intrashell transition of 6P7/2 → 8S7/2 (Gd3+). The energy transfer mechanism was explained by an energy level diagram of the gadolinium ion and 2,5-pyridinedicarboxylic acid ligand. It displayed remarkable CIE chromaticity coordinates of 0.1346 and 0.0678. The solid-state UV/Vis diffuse reflectance spectra unveiled that it possesses a wide optical band gap of 3.52 eV. Thermogravimetry (TG) measurements revealed that this compound is highly thermal stable up to around 500 °C.                     KEY WORDS: CIE, Energy transfer, Lanthanide, Photoluminescence, Thermal stability   Bull. Chem. Soc. Ethiop. 2020, 34(3), 479-488. DOI: https://dx.doi.org/10.4314/bcse.v34i3.5

scholarly journals Enhanced luminescence of rare-earth Tb (III) obtained by mixing of Gd (III) in a fumarate complex and intra-molecular energy transfer

2015 ◽  
Vol 33 (4) ◽  
pp. 685-691 ◽  
Author(s):  
M.D. Shah ◽  
B. Want
Keyword(s):  
Optical Properties ◽  
Energy Transfer ◽  
Rare Earth ◽  
Green Emission ◽  
Lanthanide Ions ◽  
Luminescence Spectra ◽  
Mixed Complex ◽  
Energy Transfer Mechanism ◽  
Terbium Complex ◽  
Diffusion Technique

AbstractTrivalent lanthanide ions display fascinating optical properties. Therefore, the rare-earth complexes of terbium fumarate heptahydrate and GdTb fumarate heptahydrate were grown by using a single gel diffusion technique. The crystals were characterized by different physicochemical techniques of characterization. UV-Vis and photoluminescence spectrophotometric experiments were carried out to study the optical properties of the grown crystals. Under various excitations (339 nm, 350 nm or 368 nm) the terbium fumarate complex emitted characteristic (4f-4f) green emission of Tb3+ (5D4-7FJ, J = 6, 5, 4 and 3, respectively). Luminescence spectra showed that Gd3+ ions in the mixed complex have not affected the luminescence emission peak positions, but remarkably increased the luminescent intensities of the terbium complex. The energy-transfer mechanism between the ligand and the central Tb3+ ions and from the Gd3+ to the Tb3+ was discussed.

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