Article
Engineering, Electrical & Electronic
Stevan Stojadinovic, Aleksandar Ciric
Summary: Al2O3 coatings single doped with Mn2+, and co-doped with Mn2+/Eu2+ and Mn2+/Ce3+ were synthesized using plasma electrolytic oxidation of aluminum. The PL emission intensities of Mn2+ in Al2O3:Mn2+/Eu2+ and Al2O3:Mn2+/Ce3+ are two to three orders of magnitude larger than in Al2O3:Mn2+. Efficient energy transfer from Eu2+ and Ce3+ to Mn2+ under middle UV excitation was observed in the doped coatings.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Yingshan Ma, Suyue Fu, Yichang Zhao, Chunjiao Liu, Leipeng Li, Zhijun Wang, Hao Suo, Dawei Wang, Jinxin Zhao, Panlai Li
Summary: By introducing Ce3+, Mn2+, and Tb3+ ions, a series of Sr-3(PO4)(2) phosphors were synthesized, showing color tunability and white light emission. The efficient energy transfer mechanisms among Ce3+, Mn2+, and Tb3+ ions make Sr-3(PO4)(2):Ce3+/Mn2+/Tb3+ a promising candidate for white light emitting diodes.
Article
Chemistry, Physical
Shoichiro Nagashima, Kazushige Ueda, Takahisa Omata
Summary: Ce3+-Tb3+ codoped LaLuO3 was prepared by selectively doping Tb3+ at a La or Lu site and doping Ce3+ simultaneously at a La site. X-ray diffraction analysis confirmed the occupation of Ce3+ at a La site and Tb3+ at a La or Lu site, which resulted in the expansion and contraction of the unit-cell volume. Photoluminescence analysis showed that energy transfer occurred from Ce3+ to Tb3+ at both La and Lu sites, leading to the extension of the excitation wavelength range for Tb3+ luminescence in Ce3+-Tb3+ codoped LaLuO3.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Inorganic & Nuclear
Masato Iwaki, Mizuho Onodera, Kazuyoshi Uematsu, Kenji Toda, Mineo Sato
Summary: Energy transfer from Ce3+ to Tb3+ is feasible in energy transition processes for optical devices, especially phosphor-converted white LEDs. However, most co-doped phosphors with Ce3+ and Tb3+ have weak absorption under near-ultraviolet and blue light excitation, limiting their use as near-ultraviolet or blue LEDs. In this study, novel energy transfer luminescent materials, Ba6La2Al3ScO15:Ce3+,Tb3+, were synthesized and showed promising properties for near-ultraviolet LEDs.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Electrical & Electronic
Shweta S. Sharma, Nameeta Brahme, D. P. Bisen, Pradeep Dewangan, Ishwar Prasad Sahu, Suresh G. Onkar, Vijay S. Thool, Shilpa G. Vidhale, Girish S. Mendhe
Summary: The study prepared two phosphors using a solid-state reaction method and studied their thermoluminescent properties in detail. The results showed that co-doping of Ce3+ ions enhanced the TL response of the phosphors, making them useful for dosimetric applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Adithya Prakash, V. S. Ganesha Krishna, Sahana Nagappa Moger, M. G. Mahesha
Summary: In this study, CuO thin films were successfully grown on glass substrates by spray pyrolysis technique. The structural, morphological, optical, and electrical properties of the films were thoroughly investigated. The results demonstrated that CuO films have good absorption in the visible range, indicating their potential as absorber layers in solar cells.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Jindi Wang, Riyan Su, Min Cui, Mengmeng Shang
Summary: Tri-doped Ca9LiY2/3(PO4)(7):Ce3+,Tb3+,Mn2+ phosphors exhibit tunable emission properties, with Ce3+ and Tb3+ co-doped samples ranging from bluish violet to green, and the addition of Mn2+ ions forming red emission components for warm white light. The emission intensity of the phosphors remains relatively stable at high temperatures and after multiple thermal cycles.
JOURNAL OF RARE EARTHS
(2021)
Article
Materials Science, Multidisciplinary
Basavaraj G. Hunashimarad, J. S. Bhat, P. Raghavendra, R. F. Bhajantri
Summary: The photoluminescence properties of spray pyrolyzed strontium (Sr) doped tin oxide (SnO2:Sr) thin films are greatly influenced by Sr doping, leading to a redshift in optical bandgap and an increase in visible emission intensity.
Article
Engineering, Electrical & Electronic
Xin Zhang, Feng Guo, Li Zhuang, Qinghui Jin, Xiaowei Zhang
Summary: Co-doping Ce3+ ions and size-tunable SnO2 nanocrystals into Tb3+ ions embedded silica thin films can enhance the Tb3+ emission by nine times. By optimizing the doping ratio of Sn4+ ions and annealing temperature, the size of SnO2 nanoparticles was tailored to enhance the photoluminescence emission from Tb3+ ions. Addition of a proper concentration of Ce3+ ions further increases the emission, but high concentration of Ce3+ ions attenuates the photoluminescence intensity. High annealing temperature such as 1000 degrees Celsius can also enhance the emission.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Inorganic & Nuclear
Tatyana B. Bekker, Alexey A. Ryadun, Alexey V. Davydov, Sergey V. Rashchenko
Summary: The luminescent properties of LiBa12(BO3)(7)F-4 (LBBF) single crystals and polycrystalline samples doped and co-doped with Eu3+, Tb3+, and Ce3+ were investigated for their potential use in white light-emitting diodes. The crystal structure of LBBF:Eu3+ was determined, allowing for the identification of a heterovalent isomorphic substitution in barium sites. The luminescent properties of LBBF crystals co-doped with Eu3+, Tb3+, Ce3+ and Eu3+, Tb3+ were compared, with both samples exhibiting a similar luminescence close to daylight.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Electrical & Electronic
M. Sathya, G. Selvan, K. Kasirajan, S. Usha, P. Baskaran, M. Karunakaran
Summary: This study employed a simple and cost-effective SILAR approach to fabricate ZnO and Zr-doped ZnO thin films. The incorporation of Zr improved the NH3 sensing performance of the films, resulting in excellent gas response and stability.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Optics
Ganesha V. S. Krishna, M. G. Mahesha
Summary: The study investigated the effect of manganese doping on zinc sulfide thin films for blue light emitting diodes, revealing enhanced blue emission at 2% manganese concentration. The absence of orange emission related to manganese was noted. Spectroscopic characterization and XPS analysis provided insights into the anomalous behavior of manganese related defects in the films.
JOURNAL OF LUMINESCENCE
(2021)
Article
Engineering, Electrical & Electronic
Rabab Bekkari, Larbi Laanab, Boujemaa Jaber
Summary: In this study, undoped and aluminum-doped ZnO films were synthesized using the sol-gel process with different concentrations of Al. The effect of Al concentrations on the growth orientation, morphology, and optical properties of ZnO thin films was investigated. The results showed that the crystal quality, preferential growth orientation, lattice parameters, and mean crystallite size were all influenced by changing the Al concentration.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Ceramics
Zhidan Song, Long Zhang, Quan Zhou, Ziang Zhang, Zhaobo Dong, Lifan Nie, Qingyi Liu, Gebo Pan
Summary: To ensure safety in using hydrogen energy, highly sensitive hydrogen sensors are needed for early detection of hydrogen leaks. In this study, a low-cost process was used to fabricate PdO-decorated NiO hydrogen sensors capable of detecting sub-ppm H2 concentration. The results show that PdO doping significantly enhances the gas response to H2.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Applied
Yuxuan Qi, Ruirui Yang, Yan Gao, Pengfei Jiang, Rihong Cong, Tao Yang
Summary: Rare earth pentaborates show potential as photoluminescent hosts for various rare earth activators. Energy transfer between Ce3+ and Tb3+/Dy3+ was observed through dipole-dipole electric interactions. The white emission of Dy3+ was enhanced by 20 times.
JOURNAL OF RARE EARTHS
(2022)
Article
Materials Science, Multidisciplinary
M. E. Alvarez-Ramos, J. Alvarado-Rivera, F. Felix-Dominguez, R. C. Carrillo-Torres, R. Sanchez-Zeferino, G. Saavedra-Rodriguez
Summary: A series of TeO2-GeO2-ZnO glasses doped with Tb3+ and Eu3+ in different ratios were investigated for their luminescent and colorimetric properties in lighting devices. X-ray diffraction and Raman spectroscopy confirmed the glassy nature of the fabricated samples. The doping effects were analyzed through fluorescence and time-resolved spectroscopy. Energy transfer between Tb3+ and Eu3+ ions was observed, with Tb3+ -> Eu3+ being the main interaction type, and the CIE1931 chromaticity coordinates showed multicolor tuning from green to orange-red.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Luis Becerril, Jesus Balderas, Jorge Hernandez, Bibiana Rodriguez, Juan Alonso, Ciro Falcony
Summary: In this work, a green synthesis approach using water as the only solvent to deposit CsPbCl3 and CsPbCl3:Yb3+ films by aerosol assisted chemical vapor deposition technique under ambient atmospheric conditions, is proposed. The as-deposited films show a photoluminescent excitonic emission peak around 418 nm and an additional peak at 984 nm emission band associated with the Yb3+ infrared 2F(5/2) to 2F(7/2) transitions for doped materials. Near infra-red photoluminescence emission is notably improved upon antisolvent assistance up to a threefold increase for ethanol, reaching a photoluminescence quantum yield of 33.94% at low Yb3+ concentration.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Optics
Anastasiya Sedova, Ciro Falcony
Summary: The photoluminescence and structural characteristics of neodymium-doped gadolinium niobate cube-like particles were investigated, and the effects of annealing temperature on their properties were studied. The nanophosphors synthesized via hydrothermal method contained water, which could be gradually eliminated through low-temperature thermal treatment. The water-assisted energy transfer mechanism resulted in an increased photoluminescence emission intensity. After annealing, the nanophosphors exhibited different crystalline structures and near-infrared (NIR) emissions. These results indicate that the neodymium-doped gadolinium niobate cube-like nanophosphors have great potential in various applications.
JOURNAL OF LUMINESCENCE
(2023)
Review
Optics
Maria F. Ferreira, Willian E. do N. Melo, Ciro Falcony, Lucas A. Rocha, Eduardo J. Nassar
Summary: We prepared a gadolinium vanadate (GdVO4) matrix doped with lanthanide ions (Eu3+, Er3+, and Yb3+) using the non-hydrolytic sol-gel method. The doped GdVO4 matrix can absorb ultraviolet and infrared radiation and emit in the visible, red, green, and infrared regions. This material has potential applications in photovoltaic cells to utilize the entire solar spectrum.
JOURNAL OF LUMINESCENCE
(2023)
Article
Nanoscience & Nanotechnology
Jesus Uriel Balderas Aguilar, Luis Alberto Becerril-Landeros, Ismael Arturo Garduno Wilches, M. Garcia-Hipolito, Arturo Rodriguez-Gomez, Luis Escobar-Alarcon, Ciro Falcony, Juan Carlos Alonso-Huitron
Summary: A family of luminescent low-dimensional metal halides has emerged as a green alternative to toxic lead halide phosphors for optoelectronic applications. In this study, highly luminescent films of copper halide phosphors with violet, blue, and green emissions were synthesized and characterized. The films were deposited using aerosol-assisted chemical vapor deposition from methanolic solutions. The photoluminescent quantum yield values of the films varied depending on the substrate and different textured morphologies were observed. X-ray photoemission spectroscopy confirmed the presence of only highly emissive Cu(I) species.
Review
Engineering, Electrical & Electronic
Ciro Falcony, Denise Estrada-Wiese, Jessica De Anda, Oscar Perez-Diaz, Mariano Aceves-Mijares
Summary: SiO2 layers deposited at low temperatures have been widely studied and applied for dielectric isolation and Si-rich SiO2 with modified properties. This review introduces the synthesis methods, precursor materials, and characteristic properties of these films, as well as their applications in solar filters, antireflecting coatings, light emitting devices, and bioimaging and theranostic applications.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2023)
Article
Materials Science, Multidisciplinary
F. Felix-Dominguez, R. C. Carrillo-Torres, R. Sanchez-Zeferino, M. E. Alvarez-Ramos
Summary: ZnO-ZnS-SiO2 composites were synthesized using ultrasound-assisted Stober method, allowing for tunable emission. SEM images showed star-shaped ZnO structures with multiple spindles, measuring approximately 1 μm in length. The composition was confirmed through EDS, FT-IR, and Raman spectroscopies. X-ray diffraction analysis revealed hexagonal wurtzite and cubic sphalerite crystal structures for ZnO and ZnS, respectively. The estimated band gap values were 3.61 eV for ZnS, 3.13 eV for ZnO, and 3.21 eV for the composites. The emission spectra exhibited weak excitonic signals and broad bands, with a range of colors from orange to blue as the ZnS content increased, allowing for white light generation.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Inorganic & Nuclear
E. Montes, J. C. Guzman-Olguin, C. Falcony Guajardo, J. Guzman Mendoza
Summary: This study investigates the impact of terbium trivalent ions on the growth kinetics and phase of hafnium oxide nanoparticles, as well as their response to radiation within the range of 256 to 286 degrees Celsius. The nanoparticles were synthesized via hydrothermal methods, with temperature held constant while varying the reaction time and terbium concentration. The results reveal a gradual transition in phase from monoclinic to tetragonal as the concentration of terbium trivalent ions increases, with the tetragonal phase becoming predominant at dopant concentrations exceeding 5%. Moreover, the radiative lifetimes experience significant changes upon the appearance of the tetragonal phase.
APPLIED RADIATION AND ISOTOPES
(2023)
Article
Materials Science, Multidisciplinary
I. A. Cordero-Martinez, R. Martinez-Martinez, G. Juarez-Lopez, M. Garcia-Hipolito, M. Aguilar-Frutis, F. Ramos-Brito, O. Alvarez-Fregoso, C. Falcony
Summary: Polycrystalline HfO2 and HfO2:Al3+ coatings were synthesized using the spray pyrolysis technique, and the photo-luminescence and cathodoluminescence characteristics were studied. The coatings exhibited blue, bluish-white, and warm white emission depending on the synthesis parameters. The photoluminescence emission was enhanced with higher deposition temperature but was quenched with increased dopant concentration. Some coatings had CIE chromatic co-ordinates close to ideal white emission, making them potentially useful in white lighting systems. Structural characterization was also conducted using various techniques.
Article
Materials Science, Multidisciplinary
K. B. Garcia-Lopez, R. Martinez-Martinez, A. N. Meza-Rocha, V. Vargas-Garcia, R. Lozada-Morales, R. Agustin-Serrano, E. Rubio-Rosas, G. Cedillo del Rosario, S. Carmona-Tellez
Summary: This work reports the synthesis and characterization of calcium tungstate-based micro-nanophosphors using the spray pyrolysis technique. CaWO4 and CaWO4:Eu(III) were found to have quasi-spherical shape according to Scanning Electron Microscopy measurements. The luminescent properties of CaWO4 are attributed to electron transition within unperturbed WO42- complexes, while CaWO4:Eu(III) displays luminescence due to radiative transitions within Eu(III) electronic energy states. The blended 3D resin with these phosphors exhibit blue luminescence and can be activated to produce red emission under different excitation wavelengths.
Article
Chemistry, Physical
Anna Lucia Pellegrino, Emil Milan, Adolfo Speghini, Graziella Malandrino
Summary: In this study, Eu-doped CaF2 thin films were fabricated using the sol-gel process for down-shifting applications. The fine-tuning of parameters resulted in high uniformity films with good crystalline properties even at low temperatures. The down-shifting properties were validated through fluorescence measurements, and a correlation with doping ion percentages was observed.
Article
Chemistry, Physical
Anna L. Pellegrino, Cristina Tudisco, Francesca Lo Presti, Emil Milan, Adolfo Speghini, Guglielmo G. Condorelli, Graziella Malandrino
Summary: For the first time, a gas-phase route called molecular layer deposition (MLD) was used to create a monolayer of metalorganic Eu(III) molecules on a NiO oxide layer. The NiO layer was activated using H2O/O2 vapors and then functionalized with molecules of the Eu complex at different temperatures to promote the chemisorption process. The effects of activation process and MLD temperature on the chemisorption of the Eu complex were evaluated using X-ray photoelectron and luminescence spectroscopy. The research findings defined the stoichiometry of the chemisorbed Eu moiety and optimized a strategy for synthesizing hybrid metalorganic/inorganic systems. The luminescence properties of the hybrid system confirmed energy conversion phenomena of the monolayer and provided information about the local environment of the Eu(III) complex anchored on the NiO surface.
Article
Materials Science, Multidisciplinary
Francesca Lo Presti, Anna Lucia Pellegrino, Emil Milan, Eros Radicchi, Adolfo Speghini, Graziella Malandrino
Summary: Significant research has focused on developing novel, cost-effective materials with improved conversion efficiencies for solar technologies. BaF2 has been investigated as a potential host material for luminescent ions in photovoltaic cells. This study utilized a metal-organic chemical vapor deposition technique to fabricate europium-doped BaF2 thin films on silicon and quartz substrates. The results indicate that the deposition temperature influences the structure, morphology, and luminescence of the thin films. The findings provide valuable insights for producing lanthanide-doped BaF2 thin films with unique up-conversion, down-conversion, and down-shifting properties.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Lorenzo Branzi, Aoife Kavanagh, Michele Back, Adolfo Speghini, Yurii K. K. Gun'ko, Alvise Benedetti
Summary: In this study, new chiral luminescent Cs3Cu2Br5 needle-like microcrystals were synthesized and their optical properties were examined. The effect of the ligand structure on the transfer of chirality was also investigated.
CHEMICAL COMMUNICATIONS
(2023)
