scholarly journals Proton, UV, and X-ray Induced Luminescence in Tb3+ Doped LuGd2Ga2Al3O12 Phosphors

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 844
Author(s):  
U. Fawad ◽  
H. J. Kim ◽  
Ibrahim Gul ◽  
Matiullah Khan ◽  
Sajjad Tahir ◽  
...  
Keyword(s):  
Green Emission ◽  
Solid State Reaction Method ◽  
Structural Morphology ◽  
Green Phosphor ◽  
Light Emitting ◽  
X Ray ◽  
Blue Region ◽  
X Ray Imaging ◽  
Plasma Display ◽  
Cie Chromaticity

The well-known solid-state reaction method is used for the synthesis of Tb doped LuGd2Ga2Al3O12 phosphor. XRD and SEM techniques are used for the phase and structural morphology of the synthesized phosphor. UV, X-ray and proton induced spectroscopy is used to study the luminescence properties. LuGd2Ga2Al3O12:Tb3+ phosphor shows its highest peak in green and blue region. The two major emission peaks correspond to 5D3→7FJ (at 480 to 510 nm, blue region) and 5D4→7FJ (at 535 to 565 nm, green region). Green emission is dominant; therefore, it may be used as an efficient green phosphor. The absorption spectra of the synthesized material matches well with the spectra of light emitting diodes (LEDs); therefore, it may have applications in LEDs. X-ray spectroscopic study suggests that this phosphor may have uses in medical applications, such as X-ray imaging. The synthesized phosphor exhibits 81% efficacy in comparison to the commercial plasma display panel material (Gd2O2S:Tb3+). The Commission Internationale de l’Eclairage (CIE) chromaticity diagram is obtained for this phosphor. The decay time of ms range is measured for the synthesized phosphor.

Preparation of Y4MgSi3O13:Tb3+,Ce3+ Green Emitting Phosphor for White Light Emitting Diodes and its Luminescence Study

2011 ◽  
Vol 415-417 ◽  
pp. 1333-1339
Author(s):  
Guo Hua Song ◽  
Bin Jiang ◽  
Jian Wen Miao ◽  
Bang Dong Ding
Keyword(s):  
Sol Gel ◽  
Emission Spectra ◽  
Green Emission ◽  
Green Phosphor ◽  
Preparation Temperature ◽  
Light Emitting ◽  
Optimal Doping ◽  
Optimal Doping Concentration ◽  
White Light Emitting Diodes ◽  
Luminescence Characteristics

The Y4MgSi3O13:Tb3+,Ce3+green phosphors are synthesized by sol-gel method, the preparation temperature, reduction atmosphere and luminescence characteristics of Y4MgSi3O13doped with single Ce3+ions and Ce3+,Tb3+ions have been studied. The excitation and emission spectra of phosphors is determined by fluorescence spectrophotometer. The results show that: luminous intensity of Y4MgSi3O13:Tb3+phosphors increased after doped with Ce3+ions and the optimal doping concentration of Ce3+is 0.04. Y3.94MgSi3O13: 0.02Tb3+,0.04Ce3+green phosphor has the best luminescence characteristics under reduction atmosphere(H2:N2=1:3) at 1000°C, the phosphor gives intense green emission at 550nm originating from the5D4→7F5transition of Tb3+ions.

Synthesis and luminescence properties of red-emitting K2MgSiO4:Eu3+ phosphors

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744058
Author(s):  
Rong Yang ◽  
Huidong Tang
Keyword(s):  
Decay Curve ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Excitation Spectra ◽  
Red Phosphor ◽  
Light Emitting ◽  
X Ray ◽  
Dipole Interactions ◽  
Near Ultraviolet ◽  
White Light Emitting Diodes

A novel phosphor, K2MgSiO4:Eu[Formula: see text], was synthesized by a solid-state reaction method. The phase formation was checked by X-ray powder diffraction. The photoluminescence excitation, emission spectra, decay curve and CIE coordinates of samples with different Eu[Formula: see text] ion concentrations were investigated in detail. The excitation spectra show a broad wavelength range of 225–470 nm. The K2MgSiO4:Eu[Formula: see text] phosphors exhibit highly red emission peaking at about 616 nm which is assigned to the 5D[Formula: see text]F2 transition of Eu[Formula: see text]ions under the excitation of near-ultraviolet (NUV) (394 nm) light. The critical quenching concentration of Eu[Formula: see text] doped in the K2MgSiO4: Eu[Formula: see text] phosphors was about 10 mol.% and the concentration quenching mechanism was dipole–dipole interactions between Eu[Formula: see text] ions. The results indicate that K2MgSiO4:Eu[Formula: see text] is a potential red phosphor candidate for NUV-pumped white light emitting diodes.

Insights into a novel garnet-based yellowish-green phosphor: structure, luminescence properties and application for warm white light-emitting diodes

CrystEngComm ◽  
2019 ◽  
Vol 21 (40) ◽  
pp. 6100-6108 ◽  
Author(s):  
Xicheng Wang ◽  
Yaxin Cao ◽  
Qi Wei ◽  
Xiao Liu ◽  
Xiaoyu Liao ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Green Emission ◽  
Luminescence Properties ◽  
Green Phosphor ◽  
Light Emitting ◽  
Yellowish Green ◽  
Warm White Light ◽  
White Light Emitting Diodes

Efficient and stable yellowish-green emission has been achieved in the garnet-based phosphor CYAS:Ce3+.

Luminescence Properties and Synthesis of SrMgAl10O17:Mn4+ Red Phosphor for White Light-Emitting Diodes

2016 ◽  
Vol 16 (4) ◽  
pp. 3489-3493 ◽  
Author(s):  
Renping Cao ◽  
Hongdong Xue ◽  
Xiaoguang Yu ◽  
Fen Xiao ◽  
Donglan Wu ◽  
...  
Keyword(s):  
Red Light ◽  
Solid State Reaction Method ◽  
Luminescence Properties ◽  
Conventional Solid State Reaction ◽  
Light Emitting ◽  
White Leds ◽  
Structure Morphology ◽  
Optimal Doping Concentration ◽  
Cie Chromaticity ◽  
White Light Emitting Diodes

A series of Mn4+ doped SrMgAl10O17 phosphors are synthesized by a conventional solid-state reaction method in air, and their crystal structure, morphology, and fluorescence properties are investigated. The luminescence properties show clearly that SrMgAl10O17:Mn4+ phosphor can be excited by UV (200–380 nm), near UV (380–420 nm), and blue (420–480 nm) bands of LEDs chip, and emits red light in the range of 600 nm to 750 nm with satisfying CIE chromaticity coordinates (0.7207, 0.2793). The optimal doping concentration of Mn4+ ion is ∼1 mol%, and its lifetime is ∼1.15 ms. The possible luminous mechanism of Mn4+ ion is discussed by Tanabe-Sugano diagram. These experiment results indicate that Mn4+ doped SrMgAl10O17 phosphors can be a potential application as a red-emitting phosphor candidate in white LEDs.

Luminescence Properties of Self-Activated M3(VO4)2 (M = Mg, Ca, Sr, and Ba) Phosphors Synthesized by Solid-State Reaction Method

2016 ◽  
Vol 16 (4) ◽  
pp. 3684-3689 ◽  
Author(s):  
Xin Min ◽  
Zhaohui Huang ◽  
Minghao Fang ◽  
Yan’gai Liu ◽  
Chao Tang ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Single Phase ◽  
Uv Light ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
Reaction Method ◽  
X Ray ◽  
Yield Decrease

In this paper, M3(VO4)2 (M = Mg, Ca, Sr, and Ba) self-activated phosphors were prepared by a solid-state reaction method at 1,000 °C for 5 h. The phase formation and micrographs were analyzed by X-ray diffraction and scanning electron microscopy. The Ca3(VO4)2 phosphor does not show any emission peaks under excitation with ultraviolet (UV) light. However, the M3(VO4)2 (M = Mg, Sr, and Ba) samples are effectively excited by UV light chips ranging from 200 nm to 400 nm and exhibit broad emission bands due to the charge transfer from the oxygen 2p orbital to the vacant 3d orbital of the vanadium in the VO4. The color of these phosphors changes from yellow to light blue via blue-green with increasing ionic radius from Mg to Sr to Ba. The luminescence lifetimes and quantum yield decrease with the increasing unit cell volume and V–V distance, in the order of Mg3(VO4)2 to Sr3(VO4)2 to Ba3(VO4)2. The emission intensity decreases with the increase of temperatures, but presents no color shift. This confirms that these self-activated M3(VO4)2 phosphors can be suggested as candidates of the single-phase phosphors for light using UV light emitting diodes (LEDs).

Feasibility study of a plasma display-like radiation detector for X-ray imaging

2012 ◽  
Vol 20 (3) ◽  
pp. 269-276 ◽  
Author(s):  
Sangheum Eom ◽  
Hyoungsup Shin ◽  
Jungwon Kang ◽  
Hakjae Lee ◽  
Kisung Lee
Keyword(s):  
Feasibility Study ◽  
Radiation Detector ◽  
X Ray ◽  
X Ray Imaging ◽  
Plasma Display

Tb L3-edge X-ray Absorption Near-edge Structure Spectroscopic Analysis of Terbium-doped Phosphor Compoundsfor Plasma Display Panel Applications

2002 ◽  
Vol 17 (1) ◽  
pp. 31-35 ◽  
Author(s):  
Yong Gyu Choi ◽  
Kee-Sun Sohn ◽  
Kyong Hon Kim ◽  
Hee Dong Park
Keyword(s):  
Spectroscopic Analysis ◽  
Green Emission ◽  
Concentration Quenching ◽  
Plasma Display Panel ◽  
White Line ◽  
Edge Structure ◽  
X Ray ◽  
Line Absorption ◽  
Plasma Display ◽  
X Ray Absorption

We have analyzed Tb L3-edge x-ray absorption near-edge structure spectra of Tb-doped phosphor compounds for plasma display panel applications. Intensity and lifetime of the green emission from the Tb3+:5D4→7F5 transition were measured with respect to nominal terbium concentration in the host compounds, i.e., YBO3, YPO4,and Y4Al2O9, all of which were made through the solid-state reaction. Typical concentration quenching was evident on the fluorescence intensity and the fluorescing level lifetime in our samples. From the analyses of white line absorption peaks at TbL3-edge, it was verified that terbium is essentially trivalent in all the samples, even invery highly concentrated ones. Thus, this implies that the concentration quenching was not caused by presence of mixed-valent states of terbium. Instead, it is believed that anonradiative energy transfer route among Tb3+ ions might be responsible for thebehavior.

Investigation on Synthesis and Property of Tb3+/Dy3+ Co-Doped Gd3Al5O12 Phosphor

2017 ◽  
Vol 726 ◽  
pp. 261-265 ◽  
Author(s):  
Xin Teng ◽  
Bin Li ◽  
Jin Kai Li ◽  
Guang Bin Duan ◽  
Zong Ming Liu
Keyword(s):  
Green Emission ◽  
Color Temperature ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Efficient Energy Transfer ◽  
Green Phosphor ◽  
New Type ◽  
Ft Ir ◽  
Co Precipitation ◽  
Cie Chromaticity

The (Gd0.9-xTb0.1Dyx)3Al5O12 (x=0-0.04, GdAG:Tb3+/Dy3+) solid solution was acquired by calcining their respective precursor prepared via co-precipitation method at 1500 °C. The performance of GdAG:Tb3+/Dy3+ powders was characterized by combined technology of Fourier transform infrared absorption spectra (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) and photoluminescence (PL) spectrum analyses. The metastable Gd3Al5O12 could be stabilized by doping smaller Tb3+ ions of 10 at.%. Under the optimal UV excitation of 275 nm, the GdAG:Tb3+/Dy3+ phosphors exhibit vivid green emission at 548 nm which were attributed to the 5D4→7F5 transition of Tb3+. The CIE chromaticity coordinate was determined at (~0.32, ~0.48) with the color temperature of ~5872 K. Compared to the Dy3+-free (Gd0.9Tb0.1)AG phosphor, the emission intensity of Dy3+-doped phosphors display stronger owing to the efficient energy transfer from Dy3+ to Tb3+. The optimal amount of Dy3+ in GdAG:Tb3+/Dy3+ phosphors was determined to be ~2.5 at.% (x=0.025). The GdAG:Tb3+/Dy3+ phosphors developed in present work are expected to be a new type of green phosphor widely used in the lighting and display areas.

Effects of removing temperature of reduction gas on the luminescence characteristics of Li2BaSiO4:0.003EU2+ green phosphor

2020 ◽  
Vol 34 (22n24) ◽  
pp. 2040159
Author(s):  
Jie Li ◽  
Yang-Ming Lu ◽  
Qing-Hao Yang ◽  
Cheng-Fu Yang
Keyword(s):  
Red Light ◽  
Green Light ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Green Phosphor ◽  
Xrd Pattern ◽  
Light Emitting ◽  
Reducing Gas ◽  
White Light Emitting Diodes ◽  
Luminescence Characteristics

We had successfully synthesized green-emitting phosphors based on Li2BaSiO4 material activated by bivalent europium ions (Eu[Formula: see text]) using a solid-state reaction method in a reducing gas environment and investigated their luminescence properties. The Li2BaSiO4:0.003Eu[Formula: see text] (LSB-Eu) phosphors were synthesized at 850[Formula: see text]C for 1 h, and the reduction gas was removed at 500[Formula: see text]C, 600[Formula: see text]C, 700[Formula: see text]C and 800[Formula: see text]C, respectively. XRD pattern showed that the Li2BaSiO4, Ba2SiO4 and Li4SiO4 phases were observed in the synthesized Li2BaSiO4 composition. As the reduction gas was removed at 800[Formula: see text]C, the LSB-Eu phosphor emitted a weak red light rather than a green light. Two weak emission peaks were found at about 588 nm and 613 nm corresponding to [Formula: see text] and [Formula: see text] transitions. As temperature to remove the reduction gas was lower than 800[Formula: see text]C, the emission spectra of LSB-Eu phosphors reveled a broad peak centered at 501 nm, which emitted a green color. The intensity of photoluminescence excitation (PLE) photoluminescence emission (PL) spectra increased as the removing temperature was decreased from 700[Formula: see text]C to 500[Formula: see text]C and saturated at 500[Formula: see text]C. These results show that LSB-Eu can be a noteworthy candidate of green-emitting phosphor for the investigation of white light-emitting diodes (WLEDs).

Energy Transfer and Spectroscopic Characterization of New Green Emitting Li3Ba2Gd3(WO4)8:Tb3+ Phosphor

2018 ◽  
Vol 281 ◽  
pp. 686-691 ◽  
Author(s):  
Wen Lei Guo ◽  
Yan Ting Jiao ◽  
Ping Shun Wang ◽  
Qi Liu ◽  
Shan Liu ◽  
...  
Keyword(s):  
Critical Concentration ◽  
Green Emission ◽  
Spectroscopic Characterization ◽  
Solid State Method ◽  
Light Emitting ◽  
X Ray ◽  
Optimal Doping Concentration ◽  
White Light Emitting Diodes ◽  
Ray Patterns

A new tungstate family, Li3Ba2Gd3(WO4)8doped with Tb3+is synthesized by using a conventional high-temperature solid-state method to explore new pure green phosphors for white light-emitting diodes (WLEDs). The results from the X-Ray patterns show that the crystal structures of the hosts are composed of tungstate zigzags and the Gd3+-Gd3+units, which are isolated by the [WO4]2-groups. The critical concentration of Tb3+is up to x=2.0 in the singly doped phosphors, which is ascribed to the interaction of the isolated Gd3+ions being mitigated by [WO4]2-groups. The characteristic green emission peaks at around 547 nm are also observed, which result from the5D4→7F5transition of Tb3+ions, and the optimal doping concentration is x=2.0.

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