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1.
T. V. Bocharova A. N. Vlasova G. O. Karapetyan O. N. Maslennikova S. A. Sirotkin N. O. Tagil’tseva 《Glass Physics and Chemistry》2010,36(3):286-293
The physicochemical properties and Raman spectra of glasses of the composition 40Ba(PO3)2 · 60MgCaSrBaAl2F14 doped with europium and terbium have been investigated. The results of the performed investigations have been compared with
the data of the analysis of the recorded EPR spectra of irradiated glasses of the same compositions in terms of the model
of the effective capture volume and with the luminescence data available in the literature. The concentration ranges of terbium
and europium ions (0.05–0.10) mol % or (0.7–1.3) × 1019 ions/cm3, in which these ions retain the oxygen environment according to the analysis of the studies carried out by different methods,
are in satisfactory agreement. The dependence of the local environment of rare-earth ions in fluorophosphate glasses on their
concentration has been established. 相似文献
2.
T. V. Bocharova G. O. Karapetyan A. M. Mironov N. O. Tagil’tseva O. V. Yanush 《Glass Physics and Chemistry》2005,31(4):420-426
Doped fluorophosphate glasses containing 4–13 mol % Ba(PO3)2 have been studied. Analysis of the Raman spectra has revealed that the structure of glasses containing up to 1 mol % Ba(PO3)2 involves isolated [PO4] tetrahedra. An increase in the Ba(PO3)2 content brings about the formation of pyrophosphate groups, which are dominant in the glass containing 11 mol % Ba(PO3)2. The introduction of up to 2 mol % EuF3 into the glasses containing 5 and 7 mol % Ba(PO3)2 leads to a decrease in the Landau-Placzek ratio. This is interpreted within the model of segregation of dopant ions. From analyzing the induced absorption spectra, the content of Eu3+ ions with a predominantly phosphate environment is estimated at ∼0.005 mol %. It is shown that, for the glasses containing 4 mol % Ba(PO3)2, the intensity ratio of the Eu3+ luminescence bands attributed to the 5
D
0-7
F
1 and 5
D
0-7
F
2 transitions changes with an increase in the EuF3 content from 0.01 to 2.0 mol %. This dependence of the intensity ratio on the EuF3 content exhibits a maximum at 0.5 mol % EuF3, which is explained by the change in the local environment of the rare-earth ion.Original Russian Text Copyright © 2005 by Fizika i Khimiya Stekla, Bocharova, Karapetyan, Mironov, Tagil’tseva, Yanush. 相似文献
3.
《Ceramics International》2023,49(4):5872-5883
A series of Eu3+ and Eu3+/Gd3+ co-doped barium-bismuth-borate (Ba–Bi–B) glasses were prepared by melt-quench technique. And deliberated the physical, structural, and spectroscopic properties of all glasses and explored the energy transfer process from Gd3+ to Eu3+ ions. The density of glasses increased with increasing of Gd3+ concentration in co-doped glasses. Characteristics of steady-state and time-resolved photoluminescence (PL) of Eu-doped and Eu3+-Gd3+ co-doped glasses under different excitation wavelengths suggested the prospects of the investigated glass system for display device applications. PL spectrum displays a strong red emission peak centered at 612 nm due to the Eu3+: 5D0→ 7F2 transition. Less intense emissions centered at 577 nm (7F0), 590 nm (7F1), 651 nm (7F3) and 700 nm (7F4) are also observed from the radiative transitions of the excited state 5D0 of Eu3+ions. The values of radiative parameters such as transition probability, branching ratios, and stimulated emission cross-sections were obtained from Judd–Ofelt theory analysis and indicated the aptness of the Ba–Bi–B glasses for optical devices. A 5-fold enhancement in the PL intensity was observed in 1.0 mol% Eu3+ and 3.0 mol% Gd3+ co-doped glass under λExci. = 394 nm excitation. The calculated commission Internationale de l'eclairage color coordinates and correlated color temperature values show that the Ba–Bi–B glasses are useful for red-laser and display device applications. 相似文献
4.
María T. Colomer Lidia Zur Maurizio Ferrari Angel L. Ortiz 《Ceramics International》2018,44(11):11993-12001
Rhabdophane-type Eu3+,Tb3+-codoped LaPO4·nH2O single-crystal nanorods with the compositions La0.99999-xEuxTb0.00001PO4·nH2O (x?=?0–0.03), La0.99999-yTbyEu0.00001PO4·n′H2O (y?=?0–0.010), and La0.99999-zTbzEu0.000007PO4·n′′H2O (z?=?0–0.012) were hydrothermally synthesized with microwaves. It is shown that the Eu3+,Tb3+ codoping does not affect the thermal stability of these nanorods, which is due to the formation of substitutional solid solutions with both Eu3+ and Tb3+ replacing La3+ in the crystal lattice. Moreover, it is also shown that monazite-type Eu3+,Tb3+-codoped LaPO4 single-crystal nanorods can be obtained by calcining their rhabdophane-type Eu3+,Tb3+-codoped LaPO4·(n,n′ or n′′)H2O counterparts at moderate temperature in air, and that they are thermally stable. It is also observed that, for the same Eu3+,Tb3+-codoping content, the monazite-type Eu3+,Tb3+-codoped LaPO4 nanorods exhibit higher photoluminescent efficiency than the rhabdophane-type Eu3+,Tb3+-codoped LaPO4· (n,n′ or n′′)H2O nanorods. Moreover, it is found that the highest photoluminescence emission corresponds to the monazite-type La0.96999Eu0.02Tb0.00001PO4 nanorods for the La0.99999-xEuxTb0.00001PO4 system. However, for those compositions energy transfer from Tb3+ to Eu3+ does not occur. In addition, for an efficient energy transfer to occur, a content of at least 1?mol% Tb3+ is needed in all the studied materials. 相似文献
5.
T. V. Bocharova 《Glass Physics and Chemistry》2005,31(2):119-127
The induced electron paramagnetic resonance (EPR) and optical absorption spectra of Tb2O3-doped glasses in the LiF-MgF2-Ba(PO3)2 system are investigated. The intensities of the doublet signals from PO
4
2–
and PO
3
2–
centers in regions with different contents of the fluoride component are determined as functions of the terbium concentration. It is shown that fluorophosphate glasses can be characterized by two values of the capture volume parameter, which differ by a factor of 5.0–6.6 depending on the dopant concentration. In the range of minimum dopant concentrations at which the capture volume is maximum, the dopant ions have a hypothetically phosphate environment. It is suggested that the capture volume parameter defined by the expression lnc/c
0 = –VC
3 can be treated as a characteristic of the distribution of dopant ions in fluorophosphate glasses.Original Russian Text Copyright © 2005 by Fizika i Khimiya Stekla, Bocharova. 相似文献
6.
Aanchal Sethi Jyoti Pandey Sitharaman Uma Rajamani Nagarajan 《Journal of the American Ceramic Society》2020,103(2):1027-1036
The extent of incorporating Eu3+ and Tb3+ for bismuth in the oxygen-deficient fluorite structured Bi0.50Th0.50Oy has been examined together with the comprehension of their luminescence characteristics. The samples were synthesized by solution combustion method from which doping limits of Eu3+ and Tb3+, respectively, in the fluorite structure was determined. Uniform distribution of constituent elements was confirmed from elemental mapping. Doping Eu3+ and Tb3+-ions introduced compressive strain and oxygen vacancies in the system. Raman spectra of doped samples confirmed the fluorite structure and revealed the existence of oxygen vacancies in them. While Tb-doped samples showed a systematic decrease in band gap with increase in dopant concentration, such systematic variation was not observed for Eu-doped samples. Conclusions about the local site symmetry around Eu3+ and Tb3+ ions in the defect fluorite structure have been drawn from the photoluminescent spectral analysis of doped samples. Energy transfer from Bi3+ to Eu3+ and Tb3+-has been observed in these samples. The Judd-Ofelt analysis has been carried out to understand luminescence characteristics in these samples. 相似文献
7.
C. Nageswara Raju S. Sailaja S. Hemasundara Raju S.J. Dhoble U. Rambabu Young-Dahl Jho B. Sudhakar Reddy 《Ceramics International》2014
This article reports on the emission properties of cadmium bismuth borate (CdBiB) glasses as a function of doping concentrations of Eu3+ and Tb3+ ions. The functional groups present in the glasses have been identified by analyzing FT-IR spectra. The emission spectra of Eu3+ and Tb3+:CdBiB glasses have shown reddish green emissions at 616 nm (5D0→7F2) under the excitation at 465 nm and at 547 nm (5D4→7F5) under the excitation at 485 nm, respectively. The Judd–Ofelt (J–O) theory was applied to evaluate the J–O intensity parameters from the absorption and the emission spectra; by using the J–O intensity (Ωλ) parameters, spontaneous emission transition probability (A), total radiative transition rate (AT), radiative lifetime (τR) and branching ratios (β) of the various emission transitions have been computed for both Eu3+ and Tb3+:CdBiB glasses. The quenching behavior in the emission intensity with increased concentration of Eu3+ and Tb3+ was observed, which could be useful for optimizing the compositions toward practical applications. 相似文献
8.
P. Meejitpaisan Ramachari Doddoji S. Kothan C.K. Jayasankar J. Kaewkhao 《Ceramics International》2021,47(2):1962-1969
Europium (Eu3+)-doped fluorophosphate (PNCA:P2O5+NaF + CaF2+AlF3) glasses with the addition of cerium (Ce3+) ions were fabricated by the melt-quenching technique to know their ability for the bright red (615 nm) luminescence. The emission (PL) and excitation (PLE) spectra, decay curve measurements as well as energy transfer (ET) process of Ce3+→ Eu3+ were studied in detail. An excitation spectrum related to the 7F0→ 5D2 level of Eu3+ is used to estimate the phonon energy (1121 cm?1) of the title glass host. Under ultraviolet (UV) irradiation of 299 nm, the PL spectra of (Ce3+/Eu3+):PNCA glasses show intense red emission at 615 nm whereas the lifetime decrease with respect to increase of Eu3+ that could support the observed efficient ET from Ce3+ to Eu3+. The ET:Ce3+ →Eu3+ via quadrupole-quadrupole process was confirmed by Reisfeld's approximation and Dexter's ET formula. The ET efficiency (ηET) and critical distance (Rc) were also calculated. Interestingly, the (Ce3+/Eu3+):PNCA glasses showed intense red light emission with low correlated color temperatures and the corresponding color purity reached as great as 99%, indicating its potentiality as a red component for warm light sources. 相似文献
9.
K. Linganna S. Ju Ch. Basavapoornima C. K. Jayasankar V. Venkatramu C. J. Kim W.-T. Han 《Journal of Inorganic and Organometallic Polymers and Materials》2018,28(3):594-602
We have studied the effect of γ-ray irradiation on optical absorption, emission and decay characteristics of RE3+ (RE?=?Sm, Eu and Dy)-doped fluorophosphate glasses. Electron paramagnetic resonance (EPR) study confirms the POHC and PO3 EC defects induced in glasses by the γ-irradiation. The presence of induced defect centers significantly affects the optical and emission properties. The optical band gap values of the studied systems increased after the γ-ray irradiation. The phonon energy and electron–phonon coupling strength of Eu3+-doped fluorophosphate glass were determined from the phonon sideband analysis. The emission intensity of the RE3+ ions increased significantly after the γ-ray irradiation. The intensity parameter, R is the ratio of the intensities of the 5D0 → 7F2/5D0 → 7F1 transitions of Eu3+ ion and Y/B intensity parameter is the ratio of intensities of the 4F9/2 → 6H13∕2/4F9/2 → 6H15/2 transitions of Dy3+ ion reveal that the local environment around the RE3+ ion changed after the γ-ray irradiation in the present system. The lifetime of excited states of RE3+ ions decreased after the γ-ray irradiation due to the formation of defects induced by the γ-ray irradiation. The CIE color coordinates were determined before and after the γ-ray irradiation for the Dy3+-doped glass system. 相似文献
10.
Preparation,luminescence properties and energy transfer of Ca9Y(PO4)7: Eu2+‐Tb3+ phosphors
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Miao Tang Yanting Fan Zhongxian Qiu Jilin Zhang Liping Yu Chengzhi Li Shixun Lian Wenli Zhou 《Journal of the American Ceramic Society》2017,100(7):2991-2996
Tb3+‐doped and Eu2+, Tb3+ co‐doped Ca9Y(PO4)7 phosphors were synthesized by conventional solid‐state method. Additionally, the luminescence properties, decay behavior and energy transfer mechanism have already been investigated in detail. The green emission intensity of Tb3+ ions under NUV excitation is weak due to its spin‐forbidden f‐f transition. While Eu2+ can efficiently absorb NUV light and yield broad blue emission, most of which can be absorbed by Tb3+ ions. Thus, the emission color can be easily tuned from cyan to green through the energy transfer of Eu2+→Tb3+ in Ca9Y(PO4)7:Eu2+,Tb3+ phosphor. In this work, the phenomenon of cross‐relaxation between 5D3 and 5D4 are also mentioned. The energy transfer is confirmed to be resulted from a quadrupole‐quadrupole mechanism. 相似文献
11.
Wenjing Liu Dan Wang Yuhua Wang Jiachi Zhang Haibo Tao 《Journal of the American Ceramic Society》2013,96(7):2257-2263
K3Gd(PO4)2:RE3+ (RE = Eu, Tb) are prepared by solid‐state reaction and their photoluminescence (PL) properties are investigated under UV and VUV excitation, respectively. The obtained experimental data show that no energy transfer happens among the activator ions Tb3+ or Eu3+ under UV excitation. Under 147‐nm excitation, the strongest emission intensity of K3Gd(PO4)2:RE3+ (RE = Eu, Tb) is obtained when the activator ions Tb3+ or Eu3+ concentration is 0.8 mol, the integrate emission intensity of K3Gd0.2(PO4)2:0.8Tb3+ is about 204% of commercial phosphor Zn1.96SiO4:0.04Mn2+ with chromaticity coordinates of (0.340, 0.561) and the decay time of about 5.09 ms under 147‐nm excitation. We analyze the experimental data and propose a possible energy‐transfer mechanism under 147‐nm excitation. 相似文献
12.
《Ceramics International》2015,41(4):5525-5530
A series of single-phase Eu3+, Tb3+, Bi3+ co-doped LaPO4 phosphors were synthesized by solid-state reaction at 800 °C. Crystal structures of the phosphors were investigated by X-ray diffraction (XRD). A monoclinic phase was confirmed. The excitation (PLE) and emission (PL) spectra showed that the phosphors could emit red light centered at 591 nm under the 392 nm excitation, which is in good agreement with the emission wavelength from near-ultraviolet (n-UV) LED chip (370–410 nm). The results of PLE and PL indicated that the co-doped Tb3+ and Bi3+could enhance emission of Eu3+ and the fluorescent intensities of the phosphors excited at 392 nm could reach to a maximum value when the doping molar concentration of Tb3+ and Bi3+ is about 2.0% and 2.0%, respectively. The co-doping Tb3+ and Bi3+ ions can strengthen the absorption of near UV region. They can also be efficient to sensitize the emission of Eu3+, indicating that the energy transfer occurs from Tb3+ and Bi3+ to Eu3+ ions. From further investigation it can be found that co-doping Tb3+ and Bi3+ ions can also induce excitation energy reassignment between 5D0–7F1 and 5D0–7F2 in these phosphors, and result in more energy assignment to 5D0–7F2 emission in LaPO4:Eu3+, Tb3+, Bi3+. Our research results displayed that La0.94PO4:Eu3+0.02, Tb3+0.02, Bi3+0.02 could be a new one and could provide a potential red-emitting phosphor for UV-based white LED. 相似文献
13.
Adon Jose T. Krishnapriya Twinkle Anna Jose Cyriac Joseph N.V. Unnikrishnan P.R. Biju 《Ceramics International》2021,47(5):6790-6799
Eu3+/Nd3+ co-doped multicomponent borosilicate glasses (ND1E: 10BaO +10ZnF2+10K2O +20SiO2+(49-x) B2O3+1Nd2O3+xEu2O3) were prepared by conventional melting and rapid quench technique to evaluate the effect of Eu3+ ions in the Nd3+ doped glasses. Thermal stability, structural and spectroscopic characteristics of the ND1E glasses were investigated by using DSC, XRD, FTIR, Optical absorption, excitation and emission measurements. The Judd – Ofelt (JO) analysis is implemented to the absorption spectrum of the prepared glassy matrix in order to identify their potential applicability in lasing devices. Enhancement of 7F0 → 5L6 band (394 nm) with the increasing concentration of Eu3+ ion in the Nd3+ excitation spectra (λemi = 1060 nm) reveals the possibility of obtaining the characteristic fluorescence spectra of Nd3+ ion with the typical excitation wavelengths (Nd3+ = 584 nm and Eu3+ = 394 nm) of both rare earth ions and it is further verified from the emission spectrum. This interesting luminescence effect of showing excellent visible and NIR emission under 394 nm excitation mainly attributes the energy transfer mechanism between the RE3+ ions and the reason underlying this effect is discussed in detail with the help of partial energy level diagram. Energy transfer efficiency between the Eu3+ and Nd3+ ions were evaluated by using the radiative lifetimes of the prepared glasses. Also, a comparison of radiative properties and lasing characteristics of Eu3+/Nd3+ co-doped glasses with other Nd3+ glasses are reported. The emission intensities were characterized using CIE chromaticity diagram and the observed CIE coordinates shows a shift towards reddish – orange region with the increase in Eu3+ concentration. The quantum efficiency of the prepared glasses was determined experimentally. The obtained results suggest that the ND1E glassy system can be considered as a potential candidate for visible and NIR luminescence applications. 相似文献
14.
《Ceramics International》2016,42(12):13919-13924
A series of green-to-red color-tunable Sr3La(PO4)3:Tb3+, Eu3+ phosphors were prepared by high temperature solid-state method. The crystal structures, photoluminescence properties, fluorescence lifetimes, and energy transfer of Sr3La(PO4)3:Tb3+, Eu3+ were systematically investigated in detail. The obtained phosphors show both a green emission from Tb3+ and a red emission from Eu3+ with considerable intensity under ultraviolet (UV) excitation (~377 nm). The emission colors of the phosphors can be tuned from green (0.304, 0.589) through yellow (0.401, 0.505) and eventually to red (0.557, 0.392) due to efficient Tb3+-Eu3+ energy transfer (ET). The Tb3+→Eu3+ energy transfer process was demonstrated to be quadrupole-quadrupole mechanism by Inokuti-Hirayama model, with maximum ET efficiency of 86.3%. The results indicate that the Sr3La(PO4)3:Tb3+, Eu3+ phosphors might find potential applications in the field of lighting and displays. 相似文献
15.
A single‐phase full‐color emitting phosphor Na3Sc2(PO4)3:Eu2+/Tb3+/Mn2+ with near‐zero thermal quenching and high quantum yield for near‐UV converted warm w‐LEDs
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Dong Liu Yahong Jin Yang Lv Guifang Ju Chuanlong Wang Li Chen Weiwei Luo Yihua Hu 《Journal of the American Ceramic Society》2018,101(12):5627-5639
A single‐phase full‐color emitting phosphor Na3Sc2(PO4)3:Eu2+/Tb3+/Mn2+ has been synthesized by high‐temperature solid‐state method. The crystal structure is measured by X‐ray diffraction. The emission can be tuned from blue to green/red/white through reasonable adjustment of doping ratio among Eu2+/Tb3+/Mn2+ ions. The photoluminescence, energy‐transfer efficiency and concentration quenching mechanisms in Eu2+‐Tb3+/Eu2+‐Mn2+ co‐doped samples were studied in detail. All as‐obtained samples show high quantum yield and robust resistance to thermal quenching at evaluated temperature from 30 to 200°C. Notably, the wide‐gamut emission covering the full visible range of Na3Sc2(PO4)3:Eu2+/Tb3+/Mn2+ gives an outstanding thermal quenching behavior near‐zero thermal quenching at 150°C/less than 20% emission intensity loss at 200°C, and high quantum yield‐66.0% at 150°C/56.9% at 200°C. Moreover, the chromaticity coordinates of Na3Sc2(PO4)3:Eu2+/Tb3+/Mn2+ keep stable through the whole evaluated temperature range. Finally, near‐UV w‐LED devices were fabricated, the white LED device (CCT = 4740.4 K, Ra = 80.9) indicates that Na3Sc2(PO4)3:Eu2+/Tb3+/Mn2+ may be a promising candidate for phosphor‐converted near‐UV w‐LEDs. 相似文献
16.
Effect of codoping Ce3+ on the luminescence properties of Sr9Mg1.5(PO4)7:Eu2+ orange–yellow phosphor
Sr9Mg1.5(PO4)7:Eu2+ has recently been reported as a promising blue light-excited orange–yellow phosphor that can be used in white LED device. Here, Ce3+-codoping is found to be an effective strategy to improve the luminescence performance of Sr9Mg1.5(PO4)7:Eu2+ phosphor. The coexistence of Eu2+ and Eu3+ ions has been verified via photoluminescence spectral analysis. The reduction of Eu3+ to Eu2+ in Sr9Mg1.5(PO4)7 lattice cannot be completed in a reducing atmosphere, but can be promoted through codoping with Ce3+ ions to a great extent, which finally increase the effective concentration of Eu2+ in the crystal lattice. The Eu3+−Eu2+ reduction mechanism is analyzed using a charge compensation model. This work not only achieves enhanced luminescence of the Sr9Mg1.5(PO4)7:Eu2+ phosphor by codoping with Ce3+ ions, but also provides new insights into the design of Ce3+/Eu2+ codoped luminescent materials. 相似文献
17.
Haizhen Lai Junfei Zhang Dejian Hou Hequn Guan Xinyu Ye 《Ceramics International》2018,44(13):15072-15078
The investigation on single phase multi-color phosphors is highly meaningful for near-ultraviolet chip based white light emitting diodes. In this work, a series of Eu2+ and Tb3+ singly doped and Eu2+/Tb3+ codoped Sr5(PO4)3Cl phosphors were synthesized via a high-temperature solid state reaction method. The luminescence spectra and decay curves of Eu2+ and Tb3+ singly doped samples were discussed, the optimal doping concentrations were determined. Thanks to the spectra overlap between Eu2+ and Tb3+, nonradiative energy transfer from Eu2+ to Tb3+ was investigated. It is found electric dipole-dipole interaction played the main role for the energy transfer in codoped samples, the highest energy transfer efficiency was calculated to be 60.98%. Tunable emissions are observed for codoped samples by adjusting doping concentration. The thermal quenching properties were discussed and the activation energy (ΔE) was estimated in the present work. 相似文献
18.
Xinguo Zhang Liya Zhou Qi Pang Menglian Gong 《Journal of the American Ceramic Society》2014,97(7):2124-2129
A series of Ce3+, Tb3+, Eu3+ tri‐doped Ba2Y(BO3)2Cl red‐emitting phosphor have been synthesized by solid‐state method. The Ce3+→Tb3+→Eu3+ energy‐transfer scheme has been proposed to realize the sensitization of Eu3+ ion emission by Ce3+ ions. Following this energy‐transfer model, near‐UV convertible Eu3+‐activated red phosphors have been obtained in Ba2Y(BO3)2Cl: Ce3+, Tb3+, Eu3+ phosphors. Energy transfers from Ce3+ to Tb3+, and Tb3+ to Eu3+, as well as corresponding energy‐transfer efficiencies are investigated. The combination of narrow‐line red emission and near‐UV broadband excitation makes Ba2Y(BO3)2Cl: Ce3+, Tb3+, Eu3+ as a novel and efficient red phosphor for NUV LED applications. 相似文献
19.
You Zhou Yu-ichi Yoshizawa Kiyoshi Hirao Zoltán Lenčéš Pavol Šajgalík 《Journal of the European Ceramic Society》2011,31(1-2):151-157
LaSi3N5:Eu2+ phosphor powders were prepared by a highly efficient combustion synthesis method. It was found that the compositions of the raw powder mixtures had great influences on the phase compositions and particle morphologies of the synthesized powders. By selecting appropriate starting compositions and combustion parameters, single phase LaSi3N5:Eu2+ phosphors could be synthesized. When excited by a UV light, the LaSi3N5:Eu2+ phosphors emitted green light. The wavelength and intensity of the emission spectra were affected by the amount of Eu2+ dopant. With increasing amount of Eu2+ dopant, concentration quenching could occur and emission spectra shifted to longer wavelengths. 相似文献
20.
Xinmiao Yu Zhendong Liu Wentao Zhang Xinru Xu Haiying Du 《Ceramics International》2021,47(3):3540-3547
A series of Ca5-x(PO4)2SiO4:xEu3+ red-emitting phosphors were synthesized through solid-state reaction, and alkali metal ions A+ (A = Li, Na and K) were co-doped in Ca5(PO4)2SiO4:Eu3+ to improve its luminescence property. The impacts of synthesis temperature, luminescence center Eu3+ concentration and charge compensator A+ on the structure and luminescence property of samples were studied in detail. X-ray diffraction results indicated that prepared Ca5(PO4)2SiO4:Eu3+, A+ had a standard Ca5(PO4)2SiO4 structure with space group P63/m. Under the excitation of 392 nm, Ca5(PO4)2SiO4:Eu3+ phosphors showed a red emission consisting of several emission peaks at 593 nm, 616 nm and 656 nm, relevant to 5D0→7F1, 5D0→7F2 and 5D0→7F4 electron transitions of Eu3+ ions, respectively. Luminescence intensity and lifetime of Ca5(PO4)2SiO4:Eu3+ can be significantly enhanced through co-doping alkali metal ion A+, which play an important role as charge compensator. The results suggest that Ca5(PO4)2SiO4:Eu3+, A+ red phosphors with excellent luminescence property are expectantly served as red component for white light-emitting diodes excited by near-ultraviolet. 相似文献