Synthesis and photoluminescence properties of MZr2(PO4)3:Eu3+; Bi3+ (M=Na; K) phosphors

Open Physics ◽  
2012 ◽  
Vol 10 (2) ◽  
Author(s):  
Xipu He ◽  
Junli Huang ◽  
Liya Zhou ◽  
Qi Pang ◽  
Fuzhong Gong
Keyword(s):  
Luminescence Intensity ◽  
Emission Spectra ◽  
Concentration Quenching ◽  
Excitation Band ◽  
Photoluminescence Spectra ◽  
Photoluminescence Properties ◽  
Red Emission ◽  
Reaction Method ◽  
Red Phosphors ◽  
Pl Intensity

AbstractA series of new red phosphors, MZr2(PO4)3:Eu3+; Bi3+ (M=Na; K), were synthesized using the solidstate reaction method, and their photoluminescence spectra were measured. The MZr2(PO4)3:Eu3+; Bi3+ (M=Na; K) phosphors were efficiently excited by an ultraviolet (UV; 395 nm) source, and showed intense orange-red emission at 595 nm. Further investigation of the concentration-dependent emission spectra indicated that the MZr2(PO4)3:Eu3+; Bi3+ (M=Na; K) phosphors exhibit the strongest luminescence intensity when y = 0.01 in NaZr2(0:95−y)(PO4)3:Eu0.103+, Bi2y 3+ and y = 0.09 in NaZr2(0.95−y)(PO4)3:Eu0.103+, Bi2y 3+, whereas the relative PL intensity decreases with increasing Bi3+ concentration due to concentration quenching. The addition of Bi3+ widens the excitation band of NaZr2(0.95−y)(PO4)3:Eu0.103+, Bi2y 3+ around 320 nm, which provides the useful idea of broadening the excitation band around 300–350 nm to fit the ultraviolet chip.

Photoluminescence properties of Li2+xNb3xTi1−4xO3:Eu3+

2019 ◽  
Vol 12 (04) ◽  
pp. 1950057 ◽  
Author(s):  
Chao-Chao Guo ◽  
Qun Zeng ◽  
Chun-Feng Yao ◽  
Yan-Zhao Feng ◽  
Xi Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Red Emission ◽  
Reaction Method ◽  
X Ray ◽  
Red Phosphors ◽  
Chromaticity Coordinate

Red phosphors with compositions of Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3:3[Formula: see text]wt.% Eu[Formula: see text] [Formula: see text] were synthesized by solid-state reaction method. The samples were investigated by using X-ray diffraction (XRD) and photoluminescence spectroscopy, respectively. XRD results showed that all samples were main phase of Li2TiO3. Emission spectra of Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3:3[Formula: see text]wt.% Eu[Formula: see text] powders showed strong red emission at 612[Formula: see text]nm (5D0–7F[Formula: see text] with 396[Formula: see text]nm excitation. In addition, the excitation and emission intensity increased up to [Formula: see text], and then decreased with further increasing of the x values. And the chromaticity coordinate (CIE) of the component with [Formula: see text] was superior to other components.

Luminescence properties of Na2SiF6:Mn4+red phosphors for high colour-rendering white LED applications synthesized via a simple exothermic reduction reaction

2017 ◽  
Vol 1 (5) ◽  
pp. 928-932 ◽  
Author(s):  
Tian-Chun Lang ◽  
Tao Han ◽  
Ling-Ling Peng ◽  
Ming-Jing Tu
Keyword(s):  
Emission Spectra ◽  
Reduction Reaction ◽  
Luminescence Properties ◽  
White Led ◽  
Red Emission ◽  
Red Phosphors ◽  
Colour Rendering

Na2SiF6:Mn4+red phosphors were synthesizedviaa simple exothermic reduction reaction, and produced a sharp red emission spectra.

Synthesis and Luminescent Properties of CaSnO3:Eu Nanopowder Prepared by a Sol–Gel Route

2016 ◽  
Vol 16 (4) ◽  
pp. 3865-3868 ◽  
Author(s):  
Xiaoyan Fu ◽  
Tuyuan Zhao ◽  
Yan Zhang ◽  
Yibin Chen ◽  
Hongwu Zhang
Keyword(s):  
Sol Gel ◽  
Luminescent Properties ◽  
Luminescent Materials ◽  
Potential Candidate ◽  
Excitation Band ◽  
Transfer Energy ◽  
High Quality ◽  
Red Emission ◽  
Red Phosphors ◽  
The Eu

Luminescent properties of nanocrystalline CaSnO3:1%Eu have been investigated in order to develop novel red phosphors. The results indicate that high-quality nanoparticles with controlled stoichiometry and microstructure were prepared by a sol–gel method using citric acid and EDTA as complexes. There are two broad excitation bands located at 240 and 270 nm existing in the excitation spectrum in addition to the characteristic excitation peaks of Eu3+. Further investigations show that the excitation band located at 240 nm can be assigned to the host absorption while the Eu–O charge transfer is responsible for the 270 nm excitation band. These results indicate that the host can efficiently transfer energy to the Eu3+ ions. The more important is that since the symmetry of Eu3+ ions is lower, the pure red emission (5D0 → 7F2 transition located at 618 nm) is predominant over all the emission. This mean CaSnO3:Eu is a potential candidate for red luminescent materials.

Synthesis and Photoluminescence of Rhombic NaLa(MoO4)2:Ln3+ Nanocrystals

2016 ◽  
Vol 16 (4) ◽  
pp. 3617-3621 ◽  
Author(s):  
Yuping Wang ◽  
Mingxia Li ◽  
Kai Pan ◽  
Rong Li ◽  
Naiying Fan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Luminescence Intensity ◽  
Dopant Concentration ◽  
Emission Spectra ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Rhombic NaLa(MoO4)2:Ln3+ (Ln = Eu and Tb) nanocrystals were synthesized by a hydrothermal method. The structures and morphologies of the nanocrystals were characterized by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy. The results indicated that the crystalline size increased with increasing Na2MoO4 content. The photoluminescence properties of NaLa(MoO4)2:Ln3+ nanocrystals were investigated in detail. In the emission spectra of NaLa(MoO4)2:Eu3+ nanocrystals, the 5D0 → 7F2 is dominant, and the peak positions and spectral shapes of emissions were independent of Eu3+ concentration. The luminescence intensity increased with increasing Eu3+ concentration, up to about 10 mol%, and then decreased. In the emission spectra of NaLa(MoO4)2:Tb3+ nanocrystals, the 5D4 → 7F5 is dominant. The sample with a dopant concentration of 20 mol% showed the highest emission intensity.

Photoluminescence of GdVO4:Eu3+, Al 3+ Phosphors under VUV Excitation

2012 ◽  
Vol 18-19 ◽  
pp. 257-263 ◽  
Author(s):  
K. Park ◽  
M.H. Heo ◽  
Y. Kim ◽  
J.Y. Kim
Keyword(s):  
High Purity ◽  
Emission Intensity ◽  
Emission Spectra ◽  
Local Symmetry ◽  
Emission Peak ◽  
Photoluminescence Properties ◽  
High Quality ◽  
Red Emission ◽  
Crystallite Sizes ◽  
The Difference

The microstructure and photoluminescence properties of Gd0.94-xAlxEu0.06VO4 (0≤x≤0.04) phosphors with various Al3+ contents were investigated. The phosphors showed a nanocrystalline nature and a high-quality powder characteristic. The crystallite sizes of the phosphors were calculated to be 46-48 nm. The annealed Gd0.94-xAlxEu0.06VO4 phosphors crystallized in the tetragonal structure. In the emission spectra, several emission peaks were observed over the measured wavelength range (500-750 nm), which were caused by the difference in the transitions of Eu3+ ions, depending on the local symmetry (5D0 → 7Fj, j = 1, 2, 3, and 4). The strongest emission peak was located at 619 nm, providing a high-purity red emission. The doped Al3+ yielded significantly enhanced the emission intensity. The most intense high-purity red emission was obtained for Gd0.93Al0.01Eu0.06VO4.

Synthesis and Photoluminescence Properties of the Novel Red Phosphor Gd2MoB2O9: Eu

2011 ◽  
Vol 311-313 ◽  
pp. 1327-1331 ◽  
Author(s):  
Ling He ◽  
Wei Min Sun ◽  
Yu Tian Ding ◽  
Yu Hua Wang
Keyword(s):  
Solid State ◽  
Broad Band ◽  
Emission Peak ◽  
The Novel ◽  
Excitation Band ◽  
Photoluminescence Properties ◽  
Red Phosphor ◽  
Red Emission ◽  
Main Emission Peak ◽  
Red Luminescence

A novel phosphor, Gd2MoB2O9:Eu3+ has been synthesized by solid-state reaction and its photoluminescence in UV-VUV range are investigated. A sharp excitation band is observed in the region of 120–135 nm, which is related to the charge-transfer (CT) band of Gd3+. The broad band around 135–160 nm can be assigned to the BO3 host absorption. The broad bands around 248 nm are assigned to the CT band of Eu3+-O2-. The phosphors emit strong red luminescence centered at about 591 nm, 614 nm and 626 nm due to the5D0–7F1 and 5D0–7F2 transitions of Eu3+. The main emission peak under 254 and 147 nm excitations also shows different shifts with increasing Eu3+ concentration. This could be due to the different luminescence sites selected at high doping concentrations of Eu3+. Gd2MoB2O9:Eu3+ shows the pure red emission under both 254 and 147 nm excitations.

Synthesis and luminescence of Li2.06Nb0.18Ti0.76O3: Eu3+ Ceramics

2020 ◽  
Vol 13 (05) ◽  
pp. 2051030
Author(s):  
Xi Chen ◽  
Qun Zeng ◽  
Liu Lei ◽  
Chun-Feng Yao ◽  
Chao-Chao Guo ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Fluorescence Spectra ◽  
Sintering Temperature ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Red Emission ◽  
Reaction Method ◽  
Pl Spectra ◽  
Orange Emission

Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3: Eu[Formula: see text] luminescent ceramics were prepared by the solid-state reaction method. By means of XRD, SEM, density testing, and fluorescence spectra data, the luminescent ceramics were characterized as functions of Eu[Formula: see text] concentration and sintering temperature. With the increase of sintering temperature and Eu[Formula: see text] concentration, the peak intensities of the PLE spectra monitored at 612[Formula: see text]nm and PL spectra excited at 396[Formula: see text]nm were dramatically improved. Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3: 3[Formula: see text]wt.%Eu[Formula: see text] ceramics sintered at 1120∘C showed the highest PL intensity. The emission spectra showed orange emission at 592[Formula: see text]nm and red emission at 612[Formula: see text]nm, corresponding to the transition of 5D[Formula: see text]F1 and 5D[Formula: see text]F2 of Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3: Eu[Formula: see text] ceramics.

Luminescent properties of Eu3+-doped SmBa3B9O18

2013 ◽  
Vol 28 (S1) ◽  
pp. S41-S44 ◽  
Author(s):  
Ming He ◽  
Z.H. Zhang ◽  
Y.Z. Zhu ◽  
Y.G. Tang ◽  
Z. Song
Keyword(s):  
Luminescent Properties ◽  
Optical Devices ◽  
Concentration Quenching ◽  
Solid State Reactions ◽  
Luminescent Materials ◽  
Photoluminescence Spectra ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Eu3+-doped SmBa3B9O18 luminescent materials were synthesized by high temperature solid state reactions. The structure and photoluminescence properties of Sm(1−x)EuxBa3B9O18 (x = 0.2, 0.4, and 0.6) were investigated by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and photoluminescence spectra. The results show that doping of Eu3+ ions does not change the structure of SmBa3B9O18. The luminescence is mainly the characteristic Eu3+ ion luminescence. No concentration quenching processes occur with the increment of Eu3+ concentration. The work implies that SmBa3B9O18 is a potential host material and europium-doped SmBa3B9O18 may find application in display and optical devices.

COMBUSTION SYNTHESIS AND CHARACTERIZATION OF NANOCRYSTALLINE ALKALINE EARTH ALUMINATE Sr4Al14O25:RE(RE = Eu, Dy, Sm)

2013 ◽  
Vol 12 (04) ◽  
pp. 1350023 ◽  
Author(s):  
V. P. HEDAOO ◽  
V. B. BHATKAR ◽  
S. K. OMANWAR
Keyword(s):  
Alkaline Earth ◽  
Emission Spectra ◽  
Green Emission ◽  
Combustion Method ◽  
Superior Performance ◽  
Synthesis And Characterization ◽  
Photoluminescence Properties ◽  
Red Emission ◽  
Crystalline Nature

Nanoscale phosphors have superior performance characteristics than the bulk phosphors. This paper explains the synthesis and characterization like XRD, FTIR, SEM and photoluminescence properties of nanocrystalline Sr 4 Al 14 O 25 doped with rare earth elements like europium, dysprosium and samarium by combustion method. XRD showed the nanoscale crystalline nature of as-prepared samples. SEM confirmed size of the particle less than 100 nm. Photoluminescent emission spectra showed strong orange red emission at 593 nm for Sr 4 Al 14 O 25: Sm 3+. The green emission of Eu 2+ was observed at around 490 nm for Sr 4 Al 14 O 25: Eu 2+.

LUMINESCENCE ENHANCEMENT OF EU(III)-CHELATED COMPLEXES BASED ON NAPHTHALENE DERIVATIVE THROUGH COORDINATION ENVIRONMENT

2004 ◽  
Vol 13 (03n04) ◽  
pp. 627-632 ◽  
Author(s):  
NAM SEOB BAEK ◽  
SOO-GYUN ROH ◽  
YONG HEE KIM ◽  
MIN-KOOK NAH ◽  
HWAN KYU KIM
Keyword(s):  
Lanthanide Complexes ◽  
Photophysical Properties ◽  
Europium Complex ◽  
Photoluminescence Spectra ◽  
Europium Complexes ◽  
Coordination Environment ◽  
Luminescence Enhancement ◽  
Red Emission ◽  
Naphthalene Derivative ◽  
Pl Intensity

We have designed and synthesized novel luminescent lanthanide complexes based on a naphthalene derivative. The coordination number of complexed ligands with Eu 3+ ions is an important parameter to enhance the photoluminescence (PL) intensity. The photoluminescence spectra of Eu ( III )-cored complexes exhibit a sharp red emission band at 612 nm, corresponding to the 5 D 0→7 F 2 transition of the trivalent Eu ion. The saturated europium complexes (C-2 and C-3) have much stronger PL intensity than the unsaturated 6-coordinated europium complex (C-1), due to the instability of the C-1 complex. In this paper, the synthesis and photophysical properties of novel europium(III)-chelated complexes based on a naphthalene derivative will be discussed.

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