Article
Materials Science, Ceramics
Min Jin, Ning Li, Hong Shao, Dan Li, Feng Sun, Wensheng Yu, Xiangting Dong
Summary: Inorganic luminescent materials with special unidimensional morphologies are fabricated using electrospinning technology combined with oxidation procedure. The CaGdAl3O7:Eu3+ nanostructures exhibit tetragonal structure and emit blue and red fluorescence under UV excitation, which can be adjusted by altering the composition and morphology. This work is of great significance for studying luminescent nanomaterials with distinct unidimensional morphologies.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Jintao Kong, Andries Meijerink
Summary: Based on simple optical spectroscopy, this study identifies the reversible charge transfer mechanism in the benchmark persistent phosphors CaAl2O4:Eu2+,Nd3+. The forward charge transfer from Eu2+ to Nd3+ and the backward charge transfer from Nd2+ to Eu3+ are confirmed. The percentages of Eu2+ and Nd3+ involved in the charge transfer exceed previous estimates in other persistent phosphors, and this strategy also offers additional advantages of site selectivity in identifying different contributions of Nd3+ sites. These findings highlight the importance of reversible charge transfer in persistent phosphors and contribute to a better understanding of the persistent luminescence mechanism.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Yuna Murayama, Souta Watanabe, Mai Akase, Kazunori Matsui
Summary: In this study, the trapping mechanism in SrAl2O4:Eu,Dy phosphors was investigated by examining different preparation conditions. The results showed that oxygen vacancies induced by Sr deficiencies act as electron traps in the phosphors, and co-doping with Dy3+ ions stabilizes the traps by interacting with pre-existing oxygen vacancies. These findings provide important insights into the long-lasting luminescence mechanism of the phosphors.
JOURNAL OF LUMINESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Wanping Chen
Summary: A study on the luminescence behavior of Eu2+ and Eu3+ codoped alkaline-earth aluminum borates phosphors showed significant effects of factors such as ion substitution and excitation wavelength, with potential applications in cold cathode fluorescent lamps.
Article
Materials Science, Ceramics
I. E. Kolesnikov, R. S. Bubnova, A. Povolotskiy, Y. P. Biryukov, A. Povolotckaia, O. Yu Shorets, S. K. Filatov
Summary: This study demonstrated the luminescent properties of Ba3Lu2B6O15 phosphors doped with Eu3+ ions for the first time and reported the dependence of luminescence properties on the crystal structure. The successful isomorphic substitution of Lu3+ sites by Eu3+ ions was confirmed. Increasing Eu3+ doping concentration leads to a gradual shift in chromaticity from violet to red.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Applied
Bernhard Walfort, Nando Gartmann, Jafar Afshani, Arnulf Rosspeintner, Hans Hagemann
Summary: The persistent phosphor SrAl2O4:Eu2+,Dy3+ has been studied extensively, but the presence of two different Sr2+ sites occupied by Eu2+ ions in this phosphor is often overlooked. In this study, we propose a general scheme of energy transfers in these materials and experimentally investigate the effect of excitation wavelength on the afterglow and emission decay curves of differently doped SrAl2O4:Eu2+,Dy3+ samples. The results indicate that Dy3+ ions are involved in the trapping process, while excited Eu2+ ions can potentially transfer their energy to trap states. Understanding the contributions of different active ions on lattice sites is crucial for comprehending the afterglow processes.
JOURNAL OF RARE EARTHS
(2022)
Article
Optics
Huidong Tang, Tao Zhang, Longzhu Li, Yuwei Chen, Feifei Li
Summary: Eu3+-doped La2Ti6O15 nanoparticles were prepared via sol-gel process and demonstrated excellent luminescence and thermal stability. These phosphors show bright red luminescence and high efficiency in blue and near-UV excitation regions, making them potential candidates for high-power warm white-LED applications.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Applied
Kora Lu Rojas Baldivia, Gustavo A. Hirata
Summary: A red-emitting phosphor material was successfully synthesized using combustion synthesis method, and its properties were extensively studied. The material showed great potential for applications in solid-state white-light lamps due to its improved color rendering index.
JOURNAL OF RARE EARTHS
(2023)
Article
Materials Science, Composites
Kankavee Sukthavorn, Nollapan Nootsuwan, Chatchai Veranitisagul, Apirat Laobuthee
Summary: This research aimed to develop luminescence composite materials using polylactic acid (PLA) as a matrix and europium-doped magnesium aluminate (MgAl2O4:Eu) as a filler. The study found that the strength and toughness of the luminous fiber were improved when a suitable amount of MgAl2O4:Eu was added. The luminescent properties showed emission wavelengths between 570 and 710 nm under excitation at 240 nm, resulting in red or pink emission. Additionally, the fabrication of luminescent filaments for 3D printing was successfully achieved by modifying MgAl2O4:Eu.
POLYMER COMPOSITES
(2022)
Article
Chemistry, Inorganic & Nuclear
Hongling Wang, Ke Su, Lefu Mei, Qingfeng Guo, Libing Liao
Summary: In this study, Ba1-xZn1-yP2O7:xEu(2+/3+), yMg phosphors with rigid structures were prepared through solid-phase technology, and the gradual phase segregation from BaZnP2O7 to BaMgP2O7 was observed with increasing Mg2+ content. The phosphor exhibits tunable CIE coordinates and color emission, making it suitable for multicolor applications. Additionally, it shows potential for optical temperature measurement and anticounterfeiting purposes.
INORGANIC CHEMISTRY
(2023)
Article
Optics
Haitao Lv, Yanmin Wang, Zhidong Pan
Summary: In this study, (Eu2+, Dy3+)-co-doped strontium/calcium aluminate phosphor, which is a color-tunable emission material, was synthesized via solid-state reactions. The crystal structure, particle size/morphology, as well as photo- and mechano-luminescent properties of the phosphors were investigated. It was found that the emission color of the phosphor can be tuned by adjusting the calcium/strontium ratio.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Multidisciplinary
Pan Liang, Wen-Li Lian, Zhi-Hong Liu
Summary: A highly efficient blue-emitting phosphor of Sr[B8O11(OH)(4)]:xEu(2+) was synthesized through a medium-high temperature boric acid melting method by means of a self-reduction mechanism. It exhibits a quantum yield and color purity of 99%, with a PL intensity remaining at 84% even at 150 degrees C.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Dan Zhao, Shuang-Yin Zhu, Rui-Juan Zhang, Qing-Xia Yao, Wen Liu, Ya-Li Xue
Summary: The oxidation state of Mn dopant in CsMg(PO3)(3) phosphors strongly depends on the host lattice structure. A new polymorph of CsMg(PO3)(3) with single Mn2+-oxidation was synthesized and found to have excellent thermostability, suitable for LED backlight display.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
T. S. Bulatova, N. A. Bogachev, A. A. Betina, A. N. Smirnov, E. V. Solovieva, M. Yu. Skripkin, A. S. Mereshchenko
Summary: The nanocrystalline phosphor NaGd0.7Eu0.3F4 with the most intensive luminescence among NaGd1-xEuxF4 (x = 0-1) compounds was successfully obtained by hydrothermal synthesis, and its properties were characterized, showing the highest luminescent performance.
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
David Van der Heggen, Rugile Zilenaite, Egle Ezerskyte, Verena Fritz, Katleen Korthout, Dimitri Vandenberghe, Johan De Grave, Jan Garrevoet, Laszlo Vincze, Dirk Poelman, Jonas J. Joos, Philippe F. Smet
Summary: This study presents a wireless and quantitative light dosimeter based on SrAl2O4:Eu2+,Sm3+, a phosphor that can store energy upon exposure to blue and ultraviolet light. It demonstrates the potential for optical read-out and successful measurement of average daylight intensities using this technology.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Christiane Stoll, Markus Seibald, Dominik Baumann, Jascha Bandemehr, Florian Kraus, Hubert Huppertz
Summary: In this study, KLiSiF6 and CsLiSiF6 were synthesized via a high-pressure/high-temperature synthesis route, exhibiting similar crystalline structures but distinct main motifs. Characterization was achieved through single-crystal and powder X-ray diffraction, infrared spectroscopy, and EDX measurements. Luminescence spectroscopy revealed line emission in the red spectral region for Mn4+-doped KLiSiF6, with a maximum emission wavelength of 631 nm.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Freia Ruegenberg, Markus Seibald, Dominik Baumann, Simon Peschke, Frauke Philipp, Hubert Huppertz
Summary: A new alkali lithosilicate compound Rb[Li5Si2O7] was discovered with a highly condensed lithosilicate framework. The intense green luminescence of Eu2+-doped Rb[Li5Si2O7] was revealed, with in-depth crystal analysis showing a core-shell formation even in high quality single crystals. The known green phosphor RbLi[Li3SiO4](2):Eu2+ was identified as the source of luminescence within the tiny core surrounded by a larger matrix of Rb[Li5Si2O7].
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Jascha Bandemehr, Dominik Baumann, Markus Seibald, Florian Kraus
Summary: In this study, eight novel red-emitting Mn4+-substituted phosphors were synthesized using a dry-chemical fluorination process, with two of them showing a blue-shift in their emission maximum. The compounds were characterized by powder X-ray diffraction, IR and emission spectroscopy, and the crystal structures of the unsubstituted compounds were also presented.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Jascha Bandemehr, Dominik Baumann, Markus Seibald, Kim Eklund, Antti J. Karttunen, Florian Kraus
Summary: In this study, 16 novel red-emitting Mn(IV)-substituted phosphors were synthesized using a dry-chemical fluorination process without the use of hydrofluoric acid. Compared to the commonly used red-emitter K2SiF6 : Mn, some of the synthesized compounds showed a blue-shift in their emission maxima.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Daniel S. Wimmer, Markus Seibald, Dominik Baumann, Simon Peschke, Klaus Wurst, Gunter Heymann, Daniel Dutzler, Amador Garcia-Fuente, Werner Urland, Hubert Huppertz
Summary: LKLSO:Eu2+ was synthesized by a high-temperature solid-state reaction, with a specific crystal structure and emission characteristics. Despite the positional disorder in the structure, the cyan-green phosphor exhibits a narrow emission band with a specific emission wavelength and full width half maximum.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Freia Ruegenberg, Amador Garcia-Fuente, Markus Seibald, Dominik Baumann, Simon Peschke, Werner Urland, Andries Meijerink, Hubert Huppertz, Markus Suta
Summary: The Eu2+-activated phosphors of the UCr4C4 structure type have shown promise as narrow band phosphors for use in novel backlighting LEDs with high color gamut, with recent research focusing on understanding the complex emission spectrum and structural features of these materials.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Daniel S. S. Wimmer, Markus Seibald, Dominik Baumann, Klaus Wurst, Hubert Huppertz
Summary: Single-crystals of Li2Ba4Al2Ta2N8O:Eu2+ were synthesized and their crystal structure was determined. The compound features a three-dimensional network with BCT-zeolite type structure and can be doped with Eu2+ activator ions, exhibiting emission at 565 nm.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Fabian Zimmerhofer, Markus Seibald, Christiane Stoll, Dominik Baumann, Klaus Wurst, Hubert Huppertz
Summary: This paper presents the synthesis and characterization of K3Nb2O4F5 through high-pressure and high-temperature conditions. The crystal structure of K3Nb2O4F5 is closely related to that of Ba2RbFe2F9. The assignment of anion positions to oxygen and fluorine is based on crystallographic data and calculations. Doping K3Nb2O4F5 with Mn4+ results in a red phosphor material with an emission maximum at λ(max) = 630 nm.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Daniel S. Wimmer, Markus Seibald, Dominik Baumann, Klaus Wurst, Hubert Huppertz
Summary: The new compound Ba4Al7Li28.08O26.92N1.08 consists of AlO4/AlO3N tetrahedra, Ba2+ cations with 10-fold coordination, and a highly condensed LiO4 tetrahedra framework. The crystal structure of Ba4Al7Li28.08O26.92N1.08 was determined by single-crystal X-ray diffraction. Ba4Al7Li28.08O26.92N1.08 belongs to the monoclinic space group P21/m (no. 11) with specific lattice parameters. Furthermore, Ba4Al7Li28.08O26.92N1.08 doped with Eu2+ activator ion exhibits a broad band emission with multiple adjusted emission bands.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Raimund Ziegler, Markus Seibald, Christiane Stoll, Hubert Huppertz
Summary: The new zinc borate Zn3B4O9 was synthesized under high-pressure/high-temperature conditions and its structure was confirmed via single-crystal X-ray diffraction. The compound can be synthesized phase pure, which was demonstrated by Rietveld refinement. IR-spectroscopic data of a powder sample were collected.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Freia Ruegenberg, Amador Garcia-Fuente, Markus Seibald, Dominik Baumann, Gregor Hoerder, Tim Fiedler, Werner Urland, Hubert Huppertz, Andries Meijerink, Markus Suta
Summary: Red-emitting narrow-band phosphors are crucial for the next generation of high-efficiency and optimized correlated color temperature white-light phosphor-converted light-emitting diodes. The crystalline structure of SALON:Eu2+ has been studied using X-ray diffraction, low-temperature luminescence spectroscopy, and ligand field theory to understand the local coordination symmetry and ligand ratio. The mutual energy transfer between Eu2+ centers in SALON:Eu2+ has been characterized using time-resolved luminescence.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Kilian M. Riessbeck, Daniel S. Wimmer, Markus Seibald, Dominik Baumann, Klaus Wurst, Gunter Heymann, Hubert Huppertz
Summary: A previously unknown polymorph, beta-Li3SiNO2, was synthesized and found to have an orthorhombic structure with a new layer sequence. This polymorph showed a significant blue-shift in emission compared to the monoclinic phase, and exhibited intense yellow luminescence when doped with Eu2+ ions.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Daniel S. Wimmer, Kilian M. Riessbeck, Markus Seibald, Dominik Baumann, Klaus Wurst, Gunter Heymann, Hubert Huppertz
Summary: The compound Li3SiNO2:Eu2+ was synthesized using high temperature solid-state reactions in weld shut tantalum ampules, and its crystal structure was determined by single-crystal X-ray diffraction. It consists of two different layers arranged alternately along the crystallographic a-axis, and can be doped with Eu2+ activator ion to exhibit broad band emission at λ(max) = 601 nm (fwhm = 90 nm) in luminescence spectroscopy of single-crystals.
DALTON TRANSACTIONS
(2022)
