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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Miao S. H., Xia, Zhiguo, Molokeev M. S., Zhang J., Liu Q. L.
Заглавие : Crystal structure refinement and luminescence properties of blue-green-emitting CaSrAl2SiO7:Ce3+, Li+, Eu2+ phosphors
Место публикации : J. Mater. Chem. C: Royal Society of Chemistry, 2015. - Vol. 3, Is. 32. - P.8322-8328. - ISSN 2050, DOI 10.1039/c5tc01629k. - ISSN 20507534(eISSN)
Примечания : 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)
Предметные рубрики: ENERGY-TRANSFER
DIODE APPLICATIONS
SOLID-SOLUTION
CODOPING MN2+
Аннотация: Ce3+/Li+, Eu2+ singly doped and Ce3+/Li+/Eu2+-co-doped CaSrAl2SiO7 phosphors have been prepared using the conventional solid-state reaction method. The crystal structure of the melilite-type CaSrAl2SiO7 phase and the preferred crystallographic positions of the doped ions were refined using the Rietveld method. The luminescence properties and energy transfer of CaSrAl2SiO7:Ce3+, Li+, Eu2+ were studied in detail. The Ce3+/Li+ activated CaSrAl2SiO7 phosphor has a strong absorption band in the range of 200-450 nm and shows a blue emission centered at 477 nm. When Eu2+ ions are co-doped with Ce3+/Li+, the emission color of CaSrAl2SiO7:Ce3+, Li+, Eu2+ phosphors under the irradiation of 365 nm can be tuned from blue to green via the energy transfer from Ce3+ to Eu2+ ions. Also the involved energy transfer process and the corresponding mechanism between Ce3+ and Eu2+ have been discussed in detail. These results indicate that the as-reported CaSrAl2SiO7:Ce3+, Li+, Eu2+ phosphors have potential applications in near-UV chip pumped white LEDs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen M., Xia Z., Molokeev M. S., Liu Q.
Заглавие : Structural phase transformation and luminescent properties of Ca2-xSrxSiO4:Ce3+ orthosilicate phosphors
Место публикации : Inorg. Chem.: American Chemical Society, 2015. - Vol. 54, Is. 23. - P.11369-11376. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.5b01955
Примечания : Cited References: 38. - The present work was supported by the National Natural Science Foundations of China (Grant Nos. 51572023, 51272242, and 51511130035), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in Univ. of 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 Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (RERU2015022)
Предметные рубрики: LIGHT-EMITTING-DIODES
DICALCIUM SILICATE
CRYSTAL-STRUCTURE
SOLID-SOLUTION
BOND-VALENCE
Ce3+
Eu2+
β-Ca2SiO4
GREEN
TEMPERATURE
Аннотация: The orthosilicate phosphors demonstrate great potential in the field of solid-state lighting, and the understanding of the structure-property relationships depending on their versatile polymorphs and chemical compositions is highly desirable. Here we report the structural phase transformation of Ca2-xSrxSiO4:Ce3+ phosphor by Sr2+ substituting for Ca2+ within 0 ≤ x 2. The crystal structures of Ca2-xSrxSiO4:Ce3+ are divided into two groups, namely, β phase (0 ≤ x 0.15) and α′ phase (0.18 ≤ x 2), and the phase transition (β → α′) mechanism originated from the controlled chemical compositions is revealed. Our findings verified that the phase transition Pnma (α′-phase) ↔ P21/n (β-phase) can be ascribed to the second-order type, and Sr2+ ions in Ca2-xSrxSiO4 preferentially occupy the seven-coordinated Ca2+ sites rather than the eight-coordinated sites with increasing Sr2+ content, which was reflected from the Rietveld refinements and further clarified through the difference of the Ca-O bond length in the two polymorphs of Ca2SiO4. The emission peaks of Ce3+ shift from 417 to 433 nm in the composition range of 0 ≤ x ≤ 0.8, and the difference in the decay curves can also verify the phase transformation process. Thermal quenching properties of selected Ca2-xSrxSiO4:Ce3+ samples were evaluated, and the results show that the integral emission intensities at 200 °C maintain 90% of that at room temperature suggesting superior properties for the application as white light-emitting diodes (w-LEDs) phosphors. © 2015 American Chemical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Qiao, Jianwei, Ning, Lixin, Molokeev M. S., Chuang, Yu-Chun, Liu, Quanlin, Xia, Zhiguo
Заглавие : Eu2+ site preferences in the mixed cation K2BaCa(PO4)2 and thermally stable luminescence
Место публикации : J. Am. Chem. Soc. - 2018. - Vol. 140, Is. 30. - P.9730-9736. - ISSN 0002-7863, DOI 10.1021/jacs.8b06021
Примечания : Cited References: 40. - This work is supported by the National Natural Science Foundation of China (No. 51722202, 91622125, 51572023, and 11574003), Natural Science Foundations of Beijing (2172036) and M.M. acknowledges support of the Russian Foundation for Basic Research (17-52-53031).
Предметные рубрики: LIGHT-EMITTING-DIODES
SOLID-SOLUTION
PHOSPHORS
GREEN
BLUE
Аннотация: Site preferences of dopant Eu2+ on the locations of K+, Ba2+, and Ca2+ in the mixed cation phosphate K2BaCa(PO4)2 (KBCP) are quantitatively analyzed via a combined experimental and theoretical method to develop a blue-emitting phosphor with thermally stable luminescence. Eu2+ ions are located at K2 (M2) and K3 (M3) sites of KBCP, with the latter occupation relatively more stable than the former, corresponding to emissions at 438 and 465 nm, respectively. KBCP:Eu2+ phosphor exhibits highly thermal stable luminescence even up to 200 °C, which is interpreted as due to a balance between thermal ionization and recombination of Eu2+ 5d excited-state centers with the involvement of electrons trapped at crystal defect levels. Our results can initiate more exploration of activator site engineering in phosphors and therefore allow predictive control of photoluminescence tuning and thermally stable luminescence for emerging applications in white LEDs.
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