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    Synthesis and luminescence properties of blue-emitting phosphor Li3c2(PO4)3:Er2+ / S. X. Yu [et al.] // ECS J. Solid State Sci. Technol. - 2014. - Vol. 3, Is. 8. - P. R159-R163, DOI 10.1149/2.0071408jss. - Cited References: 33. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51002146, No. 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635) and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306). Z. G. Xia is also grateful for the financial support from University of Science and Technology Beijing. V.V.A. gratefully acknowledge the Ministry of Education and Science of the Russian Federation for the financial support. . - ISSN 2162-8769. - ISSN 2162-8777
   Перевод заглавия: Синтез и люминесцентные свойства синего люминофора Li3Sc2(PO4)3:Eu2+

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
ENERGY-TRANSFER
   PHOTOLUMINESCENCE PROPERTIES
   INORGANIC-COMPOUNDS
   EMISSION COLOR
   FULL-COLOR
   DIODES
   Eu2+
   IONS
   LEDS
   Tb
Аннотация: A new blue-emitting phosphor Li3Sc2(PO4)3:Eu2+ was synthesized by a high temperature solid-state reaction method, and the crystal structure and photoluminescence properties were investigated in detail. The preferred crystallographic position of the Eu2+ ions in the Li3Sc2(PO4)3 host were determined from the structural analysis and spectroscopic properties. The as-prepared phosphor gave an intense blue emission band centered at 439 nm with the CIE coordinate of (0.1540, 0.0317) upon the excitation of the near ultraviolet light. The critical quenching concentration of Eu2+ in Li3Sc2(PO4)3:Eu2+ was about 15 mol%, and the corresponding concentration quenching mechanism was verified to be the dipole-quadrupole interaction. The fluorescence lifetime of Eu2+ emission and the thermal stable luminescence property have been investigated. Li3Sc2(PO4)3:Eu2+ was found to be a promising candidate as a blue-emitting n-UV convertible phosphor for the application in white light emitting diodes (w-LEDs).

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
SB RAS, LV Kirensky Phys Inst, Lab Crystal Phys, Krasnoyarsk 660036, Russia
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielectr Mat, Novosibirsk 630090, Russia

Доп.точки доступа:
Yu, Shixin; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Miao, Hao; Atuchin, V. V.
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    Cation substitution dependent bimodal photoluminescence in whitlockite structural Ca3-xSrx(PO4)2:Eu2+ (0 ≤ x ≤ 2) solid solution phosphors / H. P. Ji [et al.] // Inorg. Chem. - 2014. - Vol. 53, Is. 20. - P. 11119-11124, DOI 10.1021/ic501679f. - Cited References: 37. - This work was supported by the National Natural Science Foundations of China (Grant Nos. 51032007, 51002146, 51272242), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130022110006), the Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), and Beijing Youth Excellent Talent Program (YETP0635). V.V.A. acknowledges the Ministry of Education and Science of the Russian Federation for financial support. . - ISSN 0020-1669. - ISSN 1520-510X
   Перевод заглавия: Катион зависимая бимодальная люминесценция в твердом растворе Ca3-xSrx(PO4)2:Eu2+ (0 ˂ x ˂ 2) со структурой витлокита

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
LIGHT-EMITTING-DIODES
   EFFICIENT ENERGY-TRANSFER
   EMISSION-TUNABLE PHOSPHOR
   EXCITED WHITE LEDS
   CRYSTAL-STRUCTURE
   LUMINESCENCE PROPERTIES
   Mn2+ PHOSPHOR
   COLOR TONE
   PHASE
   Eu2+
Аннотация: Cation substitution dependent tunable bimodal photoluminescence behavior was observed in the Ca3-xSrx(PO4)2:Eu2+ (0 ≤ x ≤ 2) solid solution phosphors. The Rietveld refinements verified the phase purity and whitlockite type crystal structure of the solid solutions. The tunable photoluminescence evolution was studied as a function of strontium content, over the composition range 0.1 ≤ x ≤ 2. In addition to the emission band peak at 416 nm in Ca3(PO4)2:Eu2+, the substitution of Ca2+ by Sr2+ induced the emerging broad-band peak at 493-532 nm. A dramatic red shift of the emission peak located in the green-yellow region was observed on an increase of x in the samples with 0.75 ≤ x ≤ 2.00. The two emission bands could be related to the EuOn-Ca9 and EuOn-Ca9-xSrx emitting blocks, respectively. The values for the two kinds of emitting blocks in the solid solutions can be fitted well with the observed intensity evolution of the two emission peaks.

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
SB RAS, LV Kirensky Phys Inst, Lab Crystal Phys, Krasnoyarsk 660036, Russia
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia
Univ Auckland, Dept Chem & Mat Engn, Auckland 1142, New Zealand

Доп.точки доступа:
Ji, H. P.; Huang, Z. H.; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Атучин, Виктор Валерьевич; Huang, S. F.
}
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    Blue-shift of Eu2+ emission in (Ba,Sr)3Lu(PO4)3:Eu2+ eulytite solid-solution phosphors resulting from release of neighbouring-cation-induced stress / Z. Y. Wang [et al.] // Dalton Trans. - 2014. - Vol. 43, Is. 44. - P. 16800-16804, DOI 10.1039/c4dt02319f. - Cited References: 16. - The present work was supported by the National Natural Science Foundations of China (grant no. 51002146, no. 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635) and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306). V.V.A. is partly supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 1477-9226. - ISSN 1477-9234
   Перевод заглавия: Синее смещение излучения Eu2+ в твердых растворах (Ba,Sr)3Lu(PO4)3:Eu2 со структурой эулита, вызванное снятием напряжения, индуцированного соседними катионами

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
TUNABLE COLOR TONE
   EXCITED WHITE LEDS
   CRYSTAL-STRUCTURE
   TEMPERATURE
   IONS
Аннотация: A series of iso-structural eulytite-type (Ba,Sr)(3)Lu(PO4)(3):Eu2+ solid-solution phosphors with different Sr/Ba ratios were synthesized by a solid-state reaction. Crystal structures of (Ba,Sr)(3)Lu(PO4)(3):Eu2+ were resolved by the Rietveld method, which shows an eulytite-type cubic Bi-4(SiO4)(3) structure with cations disordered in a single C-3 site while the oxygen atoms were distributed over two partially occupied sites. The emission peaks of Ba(3-x)SrxLu(PO4)(3):Eu2+ (0

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
SB RAS, Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia

Доп.точки доступа:
Wang, Z. Y.; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Atuchin, V. V.; Атучин, Виктор Валерьевич; Liu, Q. L.
}
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    Near-infrared luminescence and color tunable chromophores based on Cr3+-Doped Mullite-Type Bi2(Ga,Al)4O9 solid solutions / C. Liu [et al.] // Inorg. Chem. - 2015. - Vol. 54, Is. 4. - P. 1876-1882, DOI 10.1021/ic502779d. - Cited References: 26. - The present work was supported by the National Natural Science Foundations of China (Grants 51002146, 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306), and Fundamental Research Funds for the Central Universities (FRF-TP-14-005A1). . - ISSN 0020-1669
   Перевод заглавия: Ближняя инфракрасная люминесценция и перестраиваемые цвет хромофоры построенные на допированных Cr3+ твердых растворах Bi2(Ga,Al)4O9 со структурой муллита.

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
PERSISTENT LUMINESCENCE
   PHOSPHORS
   PIGMENT
   GARNET
   OXIDES
   FIELD
   RED
Аннотация: Cr3+-activated mullite-type Bi2Ga(4-x)AlxO9 (x = 0, 1, 2, 3, and 4) solid solutions were prepared by the solid state reaction, and their spectroscopic properties were investigated in conjunction with the structural evolution. Under excitation at 610 nm, Bi2[Ga(4-y)Aly]3.97O9:0.03Cr3+ (y = 0, 1, 2, 3, and 4) phosphors exhibited broad-band near-infrared (NIR) emission peaking at ?710 nm in the range 650?850 nm, and the optimum Cr3+ concentrations and concentration quenching mechanism were determined. Except for the interesting NIR emission, the body color changed from white (at x = 0) to green (at x = 0.08) for Bi2Ga4?xO9:xCr3+, and from light yellow (at x = 0) to deep brown (at x = 0.08) for Bi2Al4?xO9:xCr3+, respectively. Moreover, as a result of variable Al/Ga ratio, the observed body color for Bi2[Ga(4-y)Aly]3.97O9:0.03Cr3+ (y = 0, 1, 2, 3, and 4) varied from deep brown to green. The relationship between the observed colors and their diffuse reflectance spectra were also studied for the understanding of the different absorption bands. The results indicated that Cr3+-doped Bi2Ga(4-x)AlxO9 solid solutions appeared as the bifunctional materials with NIR phosphors and color-tunable pigments.

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Держатели документа:
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China.
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China.
RAS, SB, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Liu, C.; Xia, Zhiguo; Chen, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Liu, Q.
}
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    Effect of Al/Si substitution on the structure and luminescence properties of CaSrSiO4:Ce3+ phosphors: analysis based on the polyhedra distortion / S. H. Miao [et al.] // J. Mater. Chem. C. - 2015. - Vol. 3, Is. 18. - P. 4616-4622, DOI 10.1039/c5tc00339c. - Cited References:30. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51002146, 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306) and the excellent tutor section of the Fundamental Research Funds for the Central Universities of China University of Geosciences, Beijing (2652015027). - Cover image: Artwork representing main idea of this article . - ISSN 2050. - ISSN 2050-7534
   Перевод заглавия: Эффект замещения Al/Si на структуру и люминесцентные свойства люминофора CaSrSiO4:Ce3+. Анализ основанный на искажении полиэдров

РУБ Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
LIGHT-EMITTING-DIODES
COLOR-TUNABLE PHOSPHOR
ENERGY-TRANSFER
Аннотация: Blue-emitting CaSrSiO4:Ce3+,Li+ phosphors were prepared by a high temperature solid-state method, and the effect of substituting Al3+ for Si4+ in CaSrSiO4:Ce3+,Li+ has been studied. Crystal structures of the as-prepared Ca1−ySr1−ySi1−xAlxO4:yCe3+,yLi+ phosphors were resolved by the Rietveld method, which suggested that all the samples belonged to the orthorhombic symmetry (Pnma) group of α-CaSrSiO4. The photoluminescence (PL) emission and excitation spectra, the lifetime, and the effect of Al3+ concentration on the PL properties were investigated in detail. The emission peaks of the CaSrSi1−xAlxO4:Ce3+,Li+ (x = 0–0.10) phosphors were red-shifted from 452 to 472 nm with increasing Al/Si ratio. The red-shift of the Ce3+ emission is ascribed to the polyhedra distortion of the cations, originating from the variation in the neighboring [(Si,Al)O4] polyhedra, and the detailed mechanism has been discussed.

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China.
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China.
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Miao, Shihai; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Chen, Mingyue; Zhang, Jie; Liu, Quanlin
}
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    Color tunable emission and energy transfer of Ce3+ and Tb3+ co-doped novel La6Sr4(SiO4)6F2 phosphors with apatite structure / Q. Guo [et al.] // Mater. Res. Bull. - 2015. - Vol. 72. - P. 245-251, DOI 10.1016/j.materresbull.2015.07.029. - Cited References: 37. - This present work is supported by the National Natural Science Foundations of China (Grant No. 41172053). . - ISSN 0025-5408
   Перевод заглавия: Излучение с управляемым цветом и энергетический переход ионов Ce3+ и Tb3+ при их совместном допировании нового люминофора La6Sr4(SiO4)6F2 со структурой апатита

РУБ Materials Science, Multidisciplinary
Рубрики:
LIGHT-EMITTING-DIODES
   LUMINESCENCE PROPERTIES
   PHOTOLUMINESCENCE PROPERTIES
   EU2+
   LEDS
Кл.слова (ненормированные):
Inorganic compounds -- Luminescence -- Phosphors -- Optical properties -- Crystal structure
Аннотация: Single-phase La6Sr4(SiO4)6F2: Ce3+, Tb3+ samples with apatite-like structure have been synthesized via solid-state reaction method. The phase structure, luminescence properties, lifetime, the PL thermal stability, as well as the fluorescence decay curves of the samples were investigated to characterize the resulting samples. Effective energy transfer occurs from Ce3+ to Tb3+ in La6Sr4(SiO4)6F2, which shows more intense Blue-Green light under UV light excitation. In addition, a possible mechanism of the energy-transfer from Ce3+ to Tb3+ ion is also proposed. The critical distance RC of Ce3+ to Tb3+ ions in La6Sr4(SiO4)6F2 host was calculated to be 11.878 Å. All the results indicate that La6Sr4(SiO4)6F2:Ce3+, Tb3+ phosphors have potential applications to be used as near UV-convertible phosphors for white light-emitting diodes. © 2015 Elsevier Ltd. All rights reserved.

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Держатели документа:
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, School of Materials Sciences and Technology, China University of Geosciences, Beijing, China
Laboratory of Crystal Physics, Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation

Доп.точки доступа:
Guo, Q.; Liao, L.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mei, L.; Liu, H.
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    Photoluminescence of monoclinic Li3AlF6 crystals under vacuum ultraviolet and soft X-ray excitations / V. A. Pustovarov [et al.] // Opt. Mater. - 2015. - Vol. 49. - P. 201-207, DOI 10.1016/j.optmat.2015.09.011. - Cited References: 49. - This work was partly supported by the Ministry of Education and Science of the Russian Federation (the basic part of the government mandate); Center of Excellence "Radiation and Nuclear Technologies" (Competitiveness Enhancement Program of Ural Federal University, Russia), HASYLAB DESY (Projects Nos. 20110843, 20080119EC), European Social Fund ("Mobilitas" program, MJD219), Estonian Research Council (Institutional Research Funding IUT02-26) and Baltic Science Link project coordinated by the Swedish Research Council, VR . - ISSN 0925-3467
   Перевод заглавия: Люминесценция моноклинных кристаллов Li3AlF6 под вакуумным ультрафиолетом и мягким рентгеновским излучением

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
LiBaAlF6 single-crystals
   F-type centers
   LiBaF3 crystals
   Color-centers
   Recombination luminescence
   Rietveld refinement
   VUV spectroscopy
   Trapped excitons
   Energy-transfer
   Pure
Кл.слова (ненормированные):
Li3AlF6 -- Time-resolved luminescence -- VUV spectroscopy -- Defects
Аннотация: Using Bridgman technique we have grown monoclinic β-LiAF crystals suitable for optical studies, performed XRD-identification and Rietveld refinement of the crystal structure and carried out a photoluminescence study upon vacuum ultraviolet (VUV) and extreme ultraviolet (XUV)-excitations, using the low-temperature (T = 7.2 K) time-resolved VUV-spectroscopy technique. The intrinsic PL emission band at 340–350 nm has been identified as due to radiative recombination of self-trapped excitons. The electronic structure parameters were determined: bandgap E g ≈ 12.5 eV, energy threshold for creation of unrelaxed excitons 11.8 eV < E n < 12.5 eV . The PL emission bands at 320–325 and 450 nm were attributed to luminescence caused by lattice defects. We have discovered an efficient excitation of PL emission bands in the energy range of interband transitions ( E ex > 13.5 eV), as well as in the energy range of core transitions at 130 eV. We have revealed UV–VUV PL emission bands at 170 and 208 nm due to defects. A reasonable assumptions about the origin of the UV–VUV bands were discussed.

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Держатели документа:
Ural Federal University, 19, Mira Street, Yekaterinburg, Russian Federation
Institute of Physics, University of Tartu, 14c, Ravila Street, Tartu, Estonia
Kirensky Institute of Physics, SB RAS, Akademgorodok 50, Krasnoyarsk, Russian Federation
Far Eastern State Transport University, 47, Serysheva Street, Khabarovsk, Russian Federation
Institute of Geology and Mineralogy, SB RAS, 43, Russkaya Street, Novosibirsk, Russian Federation
Novosibirsk National Research University, 2, Pirogova Street, Novosibirsk, Russian Federation

Доп.точки доступа:
Pustovarov, V. A.; Пустоваров В. А.; Ogorodnikov, I. N.; Огородников И. Н.; Omelkov, S. I.; Омелков С. И.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kozlov, A. V.; Козлов А. В.; Isaenko, L. I.; Исаенко Л. И.
}
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Hybrid anchoring for a color-reflective dual-frequency cholesteric liquid crystal device switched by low voltages / Y. C. Hsiao [et al.] // Opt. Mater. Express. - 2015. - Vol. 5, Is. 11. - P. 2715-2720, DOI 10.1364/OME.5.002715. - Cited References:17. - This work was financially sponsored by the Ministry of Science and Technology, Taiwan, under grant No. 103-2923-M-009-003-MY3, by the Russian Foundation for Basic Research (project No. 14-02-31248), and by the Siberian Branch of the Russian Academy of Sciences (SB RAS) through an NSC-SB-RAS joint project between Taiwan and Russia . - ISSN 2159-3930

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
Photonic structure
Drive scheme
Modulation
Аннотация: Cholesteric liquid crystal (CLC) materials used in electro-optical (EO) devices are characterized by high operating voltage and slow response speed, which hinders their further development in display applications. Dual-frequency CLCs (DFCLCs) can solve the problem of slow bistable transition, but the operating voltage is still high, especially in color-reflective DFCLC cells. Here we report a simple approach to lowering the switching voltage as well as to shortening the response time. This technique adopts hybrid surface treatment to modulate the structural arrangement of CLC molecules. Both planar-and vertical-alignment layers are employed and coated on one and the other substrates separately to improve the electro-optical properties of DFCLCs. We show that the threshold voltage for switching can be decreased to as low as 5 V and the shortest response time is measured to be 0.8 ms, which renders CLC EO devices including displays more practical for commercial purpose.

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Держатели документа:
Natl Chiao Tung Univ, Coll Photon, Inst Imaging & Biomed Photon, Tainan 71150, Taiwan.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Lab Nonlinear Opt & Spect, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Hsiao, Yu-Cheng; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Lee, Wei; Ministry of Science and Technology, Taiwan [103-2923-M-009-003-MY3]; Russian Foundation for Basic Research [14-02-31248]; Siberian Branch of the Russian Academy of Sciences (SB RAS) through an NSC-SB-RAS joint project between Taiwan and Russia
}
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    Crystal structure evolution and luminescence properties of color tunable solid solution phosphors Ca2+xLa8-x(SiO4)6-x(PO4)xO2:Eu2+ / Y. Xia [et al.] // Dalton Trans. - 2016. - Vol. 45, Is. 3. - P. 1007-1015, DOI 10.1039/c5dt03786g. - Cited References: 42. - This work was sponsored by National Natural Science Foundation of China (Grant No. 51472223), the Program for New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-12-0951) and the Fundamental Research Funds for the Central Universities (Grant No. 2652015020). . - ISSN 1477-9226
   Перевод заглавия: Изменение кристаллической структуры и люминесцентных свойств люминофоров Ca2+xLa8-x(SiO4)6-x(PO4)xO2:Eu2+ с управляемым цветом

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
LIGHT-EMITTING-DIODES
   WHITE-LIGHT
   ENERGY-TRANSFER
   SILICATE GLASS
   SINGLE-PHASE
   EU2+
   LEDS
   PHOTOLUMINESCENCE
   EMISSION
   UV
Аннотация: A series of apatite solid solution phosphors Ca2+xLa8-x(SiO4)6-x(PO4)xO2:Eu2+ (x = 0,2,4,6) were synthesized by a conventional higherature solid-state reaction. The phase purity was examined using XRD, XPS and XRF. The crystal structure information, such as the concentration, cell parameters and occupation rate, was analyzed using a Rietveld refinement, demonstrating that the Eu2+ activated the Ca2La8(SiO4)6O2 and Ca8La2(PO4)6O2 to form continuous solid solution phosphors. Different behaviors of luminescence evolution in response to structural variation were verified among the series of phosphors. Two kinds of Eu2+ ion sites were proved using low temperature PL spectra (8k) and room temperature decay curves. The substitution of large La3+ ions by small Ca2+ ions induced a decreased crystal field splitting of the Eu2+ ions, which caused an increase in emission energy from the 5d excited state to the 4f ground state and a resultant blue-shift from 508 nm to 460 nm. Therefore, with the crystal structure evolution, the emitted color of the series of phosphors could be tuned from green to blue by adjusting the ratio of Ca/La. © 2016 The Royal Society of Chemistry.

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Держатели документа:
School of Materials Science and Technology, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, China University of Geosciences, Beijing, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, SB RAS, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation

Доп.точки доступа:
Xia, Y.; Chen, J.; Liu, Y.-G.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Guan, M.; Huang, Z.; Fang, M.
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10.

    Crystal structure and luminescence properties of green-emitting Sr1−xAl12O19:xEu2+ phosphors / B. Ma [et al.] // Ceram. Int. - 2016. - Vol. 42, Is. 5. - P. 5995-5999, DOI 10.1016/j.ceramint.2015.12.149. - Cited References: 30. - This work was supported by the National Natural Science Foundation of China (Grant nos. 51032007 and 51372232) and the Fundamental Research Funds for the Central Universities (Grant no. 2652015024). . - ISSN 0272-8842. - ISSN 1873-3956
   Перевод заглавия: Кристаллическая структура и люминесцентные свойства зеленого люминофора Sr1-xAl12O19:xEu2+

РУБ Materials Science, Ceramics
Рубрики:
COLOR-TUNABLE PHOSPHOR
   ENERGY-TRANSFER
   Dy3+ PHOSPHORS
   NEAR-UV
   Eu2+
   DIODES
   PHASE
   STATE
   Ce3+
Кл.слова (ненормированные):
Crystal structure -- Magnetoplumbite -- Phosphor
Аннотация: In this paper, a series of novel luminescent Sr1−xAl12O19:xEu2+ phosphors were synthesized by a high temperature solid-state reaction. The phase structure, photoluminescence (PL) properties, as well as the decay curves were investigated. The quenching concentration of Eu2+ in SrAl12O19 was about 0.15 (mol). Upon excitation at 378 nm, the composition-optimized Sr0.85Al12O19:0.15Eu2+ exhibited strong broad-band green emission at 530 nm with the CIE chromaticity (0.2917, 0.5736). The results indicate that Sr1−xAl12O19:xEu2+ phosphors have potential applications as green-emitting phosphors for UV-pumped white-light LEDs.

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Natl Lab Mineral Mat, Beijing 100083, Peoples R China.
SB RAS, Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.

Доп.точки доступа:
Ma, Bin; Guo, Q. F.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lv, Zhenfei; Yao, Jun; Mei, Lefu; Huang, Zhaohui
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