Synthesis and Luminescence Properties of Red Emitting Phosphors Na3CaB5O10:Eu3+

2011 ◽  
Vol 295-297 ◽  
pp. 547-550
Author(s):  
Jia Yue Sun ◽  
Jin Li Lai ◽  
Hai Yan Du
Keyword(s):  
Uv Light ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Solid State Reaction Method ◽  
Excitation Spectra ◽  
Promising Candidate ◽  
Light Emitting ◽  
White Leds ◽  
Near Ultraviolet ◽  
Chromaticity Coordinates

A series of new Na3CaB5O10:Eu3+ phosphor was synthesized by a solid-state reaction method, and its luminescent properties were investigated. The phase formation of phosphors was confirmed by X-ray powder diffraction (XRD). The excitation spectra exhibited that the phosphors could be effectively excited by near ultraviolet (392 nm) and blue (464 nm) light, which perfectly match the emission wavelength of near-UV light-emitting diodes (LEDs). The emission spectra showed that two characteristic red emission lines peaking at 592 and 613 nm can be obtained upon 394 and 463 excitation with the chromaticity coordinates of (0.6347, 0.3649), which are due to 5D0- 7F1 and 5D0-7F2transitions of Eu3+ ions. The effect of Eu3+ concentration on the emission spectrum of Na3CaB5O10:Eu3+ phosphor was studied. The results showed that the emission intensity increased with increasing Eu3+ concentration, and then decreased because of concentration quenching. The obtained results indicated that this phosphor could be a promising candidate for near-UV white LEDs.

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.

scholarly journals Preparation and photoluminescence study of Alumin o-boro silicate YAG fluorescent glass for White LED

2021 ◽  
Author(s):  
Chao Yang ◽  
Guohua Song ◽  
Jianwen Miao ◽  
Tingting Fan
Keyword(s):  
Light Emitting Diode ◽  
Emission Spectra ◽  
Precipitation Method ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Light Emitting ◽  
White Leds ◽  
Near Ultraviolet ◽  
Fluorescence Excitation Spectra ◽  
Co Precipitation

Abstract The YAG: Eu 3+ fluorescent glass for NUV(near ultraviolet) white LEDs was obtained firstly by synthesizing Y 3 Al 5 O 12 (YAG): Eu 3+ precursors through a simple co-precipitation method, and then mixing precursor with B 2 O 3 -Al 2 O 3 -SiO 2 -Na 2 O-BaO glass powder calcined at 1400°C for 2.5 hours. The as-prepared YAG glass-ceramic phosphor was investigated by DTA, XRD, SEM, and photoluminescence (PL). Influence of YAG: Eu 3+ precursor and Eu 3+ doping on excitation and emission spectra also have been studied. The results show that: the phosphor's emission peak located at 393nm is correspond to the 7 F 0 - 5 L 6 transition of Eu 3+ ions, which matches good with UV LED chips; the phosphor gives intense emission at 593nm originating from the 5 D 0 - 7 F 1 transition of Eu 3+ ions. When the YAG precursor is 0.9g and amount of Eu 3+ doped is 0.08, the fluorescence excitation spectra of glass and emission spectra of the peak intensity reach its maximum value. The YAG: Eu 3+ fluorescence glass could be a promising material for the production of near ultraviolet chip white light-emitting diode.

Luminescence Properties of Ce3+ and Tb3+ Doped Strontium Pyroborate Phosphors

2012 ◽  
Vol 502 ◽  
pp. 140-143
Author(s):  
Jia Yue Sun ◽  
Jin Li Lai ◽  
Yi Ning Sun ◽  
Zhi Guo Xia ◽  
Hai Yan Du
Keyword(s):  
Uv Light ◽  
Blue Emission ◽  
Green Emission ◽  
Luminescent Properties ◽  
Excitation Spectra ◽  
Solid State Method ◽  
Light Emitting ◽  
Near Ultraviolet ◽  
White Light Emitting Diodes ◽  
Co Doped

Ce3+ and Tb3+ co-doped Strontium Pyroborate phosphors were synthesized by the solid-state method. The luminescent properties of phosphors were investigated by using the photoluminescence emission and excitation spectra. Under the excitation of near ultraviolet (n-UV) light, Ce3+ and Tb3+ co-doped Strontium Pyroborate phosphors exhibited blue emission corresponding to the f-d transition of Ce3+ ions and green emission bands corresponding to the f-f transition of Tb3+ ions, respectively. In the Ce3+ and Tb3+ co-activated samples the Ce3+ ions strongly sensitize the luminescence of the Tb ions. The Ce3+ and Tb3+ co-doped Strontium Pyroborate phosphor could be considered as one of double emission phosphor for n-UV excited white light emitting diodes.

Photoluminescence and Energy Transfer of Ce3+ and Tb3+ Co-Doped Ba5(PO4)3Cl Phosphor for Light-Emitting Diodes

2013 ◽  
Vol 401-403 ◽  
pp. 796-799 ◽  
Author(s):  
Jia Yue Sun ◽  
Dian Peng Cui ◽  
Bing Xue ◽  
Guang Chao Sun
Keyword(s):  
Energy Transfer ◽  
Single Phase ◽  
Uv Light ◽  
Green Light ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
Effective Energy Transfer ◽  
Light Excitation

Single-phase Ba5(PO4)3Cl:Ce3+,Tb3+ (BPCl:Ce3+,Tb3+) samples have been synthesized via solid-state reaction method. The phase structure and luminescence properties are characterized using powder X-ray diffraction (XRD), photoluminescence excitation and emission spectra. Effective energy transfer occurs from Ce3+ to Tb3+ due to the observed spectral overlap between the emission band of Ce3+ and the excitation band of Tb3+. Ce3+/Tb3+-codoped Ba5(PO4)3Cl shows more intense yellowish-green light compared to that of Tb3+-doped sample under UV light excitation.

Photoluminescence Properties and Energy Transfer in a Novel Yellow Emitting Phosphor GdTaO4:Dy3+

2016 ◽  
Vol 16 (4) ◽  
pp. 3994-3997 ◽  
Author(s):  
Huijuan Zhang ◽  
Xinyu Tan ◽  
Yuhua Wang
Keyword(s):  
Energy Transfer ◽  
Vacuum Ultraviolet ◽  
Emission Spectra ◽  
Host Lattice ◽  
Excitation Spectra ◽  
Light Emitting ◽  
Ultraviolet Excitation ◽  
Plasma Display Panels ◽  
Chromaticity Coordinates ◽  
Plasma Display

The phosphor Dy3+ doped M type gadolinium orthotantalate GdTaO4 was prepared successfully by traditional solid state reaction and the photoluminescence of GdTaO4: xDy3+ (0.01 ≤ x ≤ 0.10) has been investigated under ultraviolet and vacuum ultraviolet excitation. In the excitation spectra of GdTaO4:Dy3+, the overlap appears between the host lattice excitation, the excitation lines of Gd3+ and the f–f transitions of Dy3+, which indicates that the energy transfer could occur from the host to the Dy3+ ions. In the emission spectra of the samples, the intense emissions of Dy3+ have been expectably revealed both upon excitation at 365 nm and 147 nm. And the chromaticity coordinates of GdTaO4: xDy3+ have been correspondingly calculated. The results indicate that GdTaO4:Dy3+ would be a novel yellow emitting phosphor applied in light emitting diodes (LEDs), plasma display panels (PDPs) and mercury-free fluorescent tubes.

Color Tunability of Blue Phosphors by Changing Cations for Near-UV InGaN-Based Light-Emitting Diode

2014 ◽  
Vol 986-987 ◽  
pp. 156-159
Author(s):  
Yi Wen Zhu ◽  
Fen Fen Hu ◽  
Mei Li Zhou ◽  
Ping Chen ◽  
Zheng Liang Wang
Keyword(s):  
Uv Light ◽  
Light Emitting Diode ◽  
Blue Emission ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Blue Shift ◽  
Ionic Radii ◽  
Light Emitting ◽  
Triclinic Structure ◽  
The Difference

The serials of blue phosphors, CaAl2Si2O8: Eu2+ doped with different content Sr2+ and Mg2+ ions, were prepared by solid-state reaction at high temperature. And their structure and photo-luminescent properties were investigated. In Ca0.96-ySryAl2Si2O8: 0.04Eu2+ (y = 0.10, 0.30, 0.50, 0.70, 0.90) system, for y ≦ 0.03, all the compositions crystallize in triclinic structure of CaAl2Si2O8, and on further increase of y, the system undergoes a compositionally induced phase transition from triclinic to monoclinic structure. For Ca0.96-yMgyAl2Si2O8: 0.04Eu2+ (y = 0.10, 0.30, 0.50, 0.70, 0.90) system, for z ≦ 0.03, all the compositions are of triclinic structure of CaAl2Si2O8. With the further increase of z, other phase appears. The emission spectra of these phosphors show blue shift with the introduction of Sr2+ ions, and red shift with Mg2+ ions. The reason may be due to the difference ionic radii of Mg2+, Ca2+, Sr2+. These phosphors show excellent blue emission and broad excitation band in near-UV (ultraviolet) range. They may be potential phosphors for near-UV light-emitting diodes (LEDs).

scholarly journals A broadband cyan-emitting Ca2LuZr2(AlO4)3:Ce3+ garnet phosphor for near-ultraviolet-pumped warm-white light-emitting diodes with an improved color rendering index

2020 ◽  
Vol 8 (3) ◽  
pp. 1095-1103 ◽  
Author(s):  
Liangling Sun ◽  
Balaji Devakumar ◽  
Jia Liang ◽  
Shaoying Wang ◽  
Qi Sun ◽  
...  
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Emission Spectra ◽  
Light Emitting ◽  
White Leds ◽  
Near Ultraviolet ◽  
Warm White Light ◽  
Color Rendering Index ◽  
White Light Emitting Diodes ◽  
Color Rendering

Broadband cyan-emitting Ca2LuZr2(AlO4)3:Ce3+ garnet phosphors enabled to fill the cyan gap in the emission spectra of near-ultraviolet-pumped warm-white LEDs, thus resulting in improved color rendering index.

The Structure and Photoluminescence Properties of Ca3Si2O7: Eu2+ Phosphor

2012 ◽  
Vol 509 ◽  
pp. 192-196
Author(s):  
Xing Hua Zhang ◽  
Zun Ming Lu ◽  
Fan Bin Meng ◽  
Long Hu ◽  
Xue Wen Xu ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Solid State Reaction Method ◽  
Emission Region ◽  
Photoluminescence Properties ◽  
Phosphor Particle ◽  
Sem Images ◽  
Host Matrix ◽  
Light Emitting ◽  
White Leds ◽  
Near Ultraviolet

A series of yellow-emitting phosphors based on a silicate host matrix, Ca3-xSi2O7: xEu2+, were prepared by solid-state reaction method. The structure and photoluminescent properties of the phosphors were investigated. The XRD results show that the Eu2+ substitution of Ca2+ does not change the structure of Ca3Si2O7 host. The SEM images display that phosphors aggregate obviously and the shape of the phosphor particle is irregular. The EDX results reveal that the phosphors consist of Ca, Si, O, and Eu elements. The Ca3-xSi2O7: xEu2+ phosphors can be excited at wavelength of 300-490 nm, which is suitable for the emission band of near ultraviolet or blue light-emitting-diode (LED) chips. The phosphors exhibit a broad emission region from 520 to 650 nm and the emission peak centered at 568 nm. The phosphor for has the strongest excitation and emission intensity, and the energy transfer style between Eu2+ ions is quadrupole-quadrupole interaction for higher concentration Eu2+ doped Ca3Si2O7 phosphor. The Ca3-xSi2O7: xEu2+ phosphors can be used as candidates for white LEDs.

Luminescent Properties of Ca2-XBO3Cl:xDy3+ Phosphors for White Light-Emitting Diodes

2010 ◽  
Vol 663-665 ◽  
pp. 434-436
Author(s):  
Qing Xuan Yang ◽  
Xiao Guang Fu ◽  
Xiao Jun Wang
Keyword(s):  
White Light ◽  
Light Emitting Diodes ◽  
Uv Light ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Luminescent Properties ◽  
Light Emitting ◽  
Near Ultraviolet ◽  
Optimal Doping Concentration ◽  
White Light Emitting Diodes

Novel single-phase Ca2-xBO3Cl:xDy3+ phosphors were synthesized at 900 oC in an activated carbon reducing atmosphere, and their luminescent properties were investigated by photoluminescence (PL) and photoluminescence excitation (PLE) spectra. The optimal doping concentration of Dy3+ ions is found to be x=0.03 mol, and the nature of resonance energy transfer for Dy3+ ions is also discussed. Generation of white-light excited by 390 near-ultraviolet (n-UV) light shows that all the investigated phosphors lie within white region and the colour coordinate of Ca1.95BO3Cl:0.05Dy3+ (0.272, 0.326) is closer to the equal-energy white light point, which is potentially a good candidate as an n-UV-converted phosphor for white light-emitting diodes (LEDs).

A novel high color purity yellow luminescent material NaBaBO3:Sm3+

2015 ◽  
Vol 08 (04) ◽  
pp. 1550042 ◽  
Author(s):  
Jianghui Zheng ◽  
Jia Feng ◽  
Qijin Cheng ◽  
Ziquan Guo ◽  
Lihan Cai ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Yellow Emission ◽  
Color Purity ◽  
Conventional Solid State Reaction ◽  
Light Emitting ◽  
Yellow Phosphor ◽  
Near Ultraviolet ◽  
New Type ◽  
High Color Purity

Yellow emitting Sm 3+-doped NaBa 1-x BO 3(0.01 ≤ x ≤ 0.13) phosphors were synthesized by conventional solid state reaction method. The phase structure and luminescence properties of the as-prepared phosphors were investigated. These phosphors can be effectively excited by 403 nm near-ultraviolet light and feature a satisfactory yellow performance. The emission peaks are observed at 560 nm, 603 nm and 650 nm, originating from the transitions of 4G5∕2→6H5∕2, 4G5∕2→6H7∕2 and 4G5∕2→6H9∕2 respectively. Investigation of Sm 3+ concentration-dependent emission spectra indicates that the NaBa 0.95 BO 3:0.05 Sm 3+ phosphor shows the strongest yellow emission intensity and exhibits the CIE value of x = 0.4760 and y = 0.5090. Through the theoretical calculation, a high color purity of 96.0% was determined for the NaBaBO 3: Sm 3+ phosphor, and the color purity of NaBaBO 3: Sm 3+ is much higher than that of the commercial yellow phosphor YAG : Ce 3+. This work is highly relevant to the development of a new type of potential down-conversion (DC) yellow phosphor for near ultraviolet white or yellow light-emitting diodes (LEDs).

Sign in / Sign up

Export Citation Format

Share Document