Article
Chemistry, Physical
M. Lukaszewicz, B. Klimesz, A. Szmalenberg, M. Ptak, R. Lisiecki
Summary: The study obtained GTSN glasses with varying Nd concentrations using the melt-quenching method, showing favorable thermal stability and optical properties. Various spectroscopic methods were used to analyze the glass structure and establish luminescent thermometry models.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Lech Sznitko, Tarek Chtouki, Bouchta Sahraoui, Jaroslaw Mysliwiec
Summary: This article investigates the effect of excitation wavelength on random laser emission in a dye-doped polymeric system. Changing the pumping wavelength can switch the emission between lasing bands and control their relative intensity. The random lasing phenomenon influences the resulting bichromatic emission and randomly selects the dominating lasing band.
Article
Materials Science, Multidisciplinary
John Reddy Vootukuru, Umamaheswari Hemakumar, Padma Suvarna Renigunta, Ravi Nirlakalla
Summary: In this study, Nd3+/Yb3+-codoped PNSBYNd0.5Yb0.5 glasses were investigated for their structure and photoluminescence properties. SEM and EDS were used to evaluate the microstructure and dispersed elements in the glass, while ESR spectra were used to assess the g value of unpaired electrons. XPS spectra were analyzed to examine the states of bismuth ions. The study revealed the presence of energy transfer and cross-relaxations between Nd3+ and Yb3+ under 808 nm laser excitation.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
Kun He, Libin Zhang, Yuan Liu, Beibei Xu, Liang Chen, Gongxun Bai
Summary: This study developed Yb/Er-doped La2Mo3O12 microcrystals with nonhygroscopic property and multimode luminescence for temperature sensing, showing excellent performance in sensitivity and resistance to humidity impact.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Yandong Bai, Rui Wang, Yongmei Li, Yuemei Li
Summary: Developing high-resolution, high-accuracy fluorescent thermometers poses challenges, but the study found that Yb-, Tm-, and Eu-co-doped C12A7 with flower-like structure upconversion microparticles showed promising thermal sensing properties. Eu doping significantly increased the upconversion luminescence output, and the maximum temperature sensitivity reached approximately 3.0% K-1. The multicolor upconversion emission of the material changed from blue to white with increasing temperature, and the dopants improved the optical coefficient of C12A7. The thermally regulated multicolor characteristics and energy levels of Tm3+ provide a promising strategy for accurate and effective temperature sensors.
Article
Chemistry, Physical
B. Pilarek, M. Ptak, R. Lisiecki, L. Macalik, S. Smolka, I. Szczygiel, J. Hanuza
Summary: Research shows the existence of a new solid solution in the CaO-Nd2O3-Nb2O5 ternary oxide system. The dependence of various spectra and luminescence properties on mixture composition has been reported. Dilution of Nd3+ ions by gadolinium and lanthanum improves the luminescence properties. Spectroscopic measurements provide insights into the depopulation mechanism of Nd3+ electron excited states in the materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Inorganic & Nuclear
Joao Marcos Goncalves, Mariusz Stefanski, Robert Tomala, Agata Musialek, Wieslaw Strek
Summary: The synthesis and structural characteristics of Nd3+ doped nanocrystalline LaAlO3 perovskites were investigated. Concentration quenching was observed in the excitation and Stokes emission spectra, while no such effect was observed in the anti-Stokes emission. The intensity of laser-induced white emission (LIWE) exponentially increased with the excitation laser power, and the dependence of LIWE spectra on concentration and pressure was examined. A possible inter-valence charge transfer mechanism for the white emission, involving different valences of Nd, is proposed.
DALTON TRANSACTIONS
(2023)
Article
Spectroscopy
Bingjun Zhu, Naizhen Li, Shiqi Ren, Yunlong Liu, Dong Zhang, Qingru Wang, Qiang Shi, Qinglin Wang, Shuhong Li, Bingyuan Zhang, Wenjun Wang, Cailong Liu
Summary: Zn1-xMnxAl2O4:0.1 mol% Cr3+ (0.04 <= x <= 0.16) phosphors with single spinel phase were synthesized using sol-gel method. The Mn2+/Cr3+ co-doped ZnAl2O4 nanophosphors show green and red emission bands, with an energy transfer efficiency of 83% confirmed between Mn2+ and Cr3+. The temperature-sensitive properties show a relative sensitivity change from 3.7 %K-1 to 0.25 %K-1 over a temperature range from 80 K to 310 K.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Engineering, Environmental
Teng Zheng, Laihui Luo, Peng Du, Stefan Lis, Ulises R. Rodriguez-Mendoza, Victor Lavin, Marcin Runowski
Summary: Remote temperature and pressure monitoring provides opportunities to explore the luminescence properties of compounds under extreme conditions. In this study, double perovskite Gd2ZnTiO6 phosphors doped with Mn4+ were developed as bifunctional sensors for temperature and pressure. The optimized doping concentration of Mn4+ was found to achieve the highest emission intensity, and the concentration quenching mechanism was determined to be dipole-dipole interaction. The synthesized phosphors exhibited high internal and external quantum efficiencies, and demonstrated good thermal and pressure sensing properties.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Ceramics
Haozhe Liu, Ting Wang, Yicen Ge, Xuanyu Zhu, Lin Nie, Feng Zhao, Jianbei Qiu, Xuhui Xu, Xue Yu
Summary: Optical thermometry based on distinct temperature-dependent luminescence behaviors of Mn2+ ions in different crystal sites of the NaCa2GeO4F host matrix is explored. The tunable color and distinct temperature-dependent luminescence behavior of Mn2+ ions at different sites are achieved by incorporating Fe3+ ions. This study demonstrates that the NaCa2GeO4F: Mn2+, Fe3+ phosphor is a promising candidate for optical thermometry.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Vaibhav Chauhan, Prashant Dixit, Prashant Kumar Pandey, Satyam Chaturvedi, Praveen C. Pandey
Summary: Luminescence thermometry using Dy3+/Ho3+-codoped SrMoO4 phosphor shows good relative sensitivity and minimal temperature uncertainty. The negative thermal quenching behavior of Dy3+ and Ho3+ in SrMoO4 is exploited for luminescence thermometry. The Ho3+-doped SrMoO4 also exhibits excellent thermal stability and resistance to color drift in lighting applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Jessica Dipold, Camila D. S. Bordon, Evellyn S. Magalhaes, Luciana R. P. Kassab, Ernesto Jimenez-Villar, Niklaus U. Wetter
Summary: Random laser action at 1337 nm was demonstrated for the first time using zinc tellurite and aluminum oxide glass matrices doped with neodymium oxide at different percentages. Laser emission was verified and the rise time of the laser pulse and the input-output power slope were obtained. The main lasing mechanism of this random laser system was probably a cavity composed of the sample's pump surface and an effective mirror formed by a second, parallel layer at the gain-loss boundary. The absence of emission at 1064 nm is attributed to the measured temperature rise in the samples' active volume.
Article
Materials Science, Multidisciplinary
Haibo Xu, Gongxun Bai, Kun He, Shixu Tao, Zhanling Lu, Yang Zhang, Shiqing Xu
Summary: This study successfully synthesizes NIR phosphor LaGaO3: Nd/Cr with excellent temperature sensing performance and anti-thermal quenching performance. The prepared NIR pc-LED shows good performance in terms of photoelectric conversion efficiency and NIR output power. By using the prepared NIR pc-LED as a light source, the distribution of blood vessels and bones in human palms can be observed.
MATERIALS TODAY PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
M. M. Arghavan, A. A. Sabouri-Dodaran, M. Sasani Ghamsari
Summary: In this study, neodymium-doped yttrium hydroxide nanobelts (Nd:Y(OH)(3)) were synthesized using a simple method. Various characterization techniques were used to determine the properties of the prepared colloidal sample. The structural characteristics were analyzed using XRD and HRTEM, showing that the average size of the hexagonal crystal was about 25 nm. The absorbance and emission spectra revealed that the light emission intensity of the colloidal sample was influenced by the concentration of Nd3+ ions. Excitation with wavelengths of 355 and 360 nm did not significantly alter the blue emission spectra, but excitation at 300 nm resulted in an increase in emission intensity with increasing concentration up to 0.05 g (sample 2).
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Multidisciplinary Sciences
Jinsheng Liao, Minghua Wang, Fulin Lin, Zhuo Han, Biao Fu, Datao Tu, Xueyuan Chen, Bao Qiu, He-Rui Wen
Summary: This study reports a unique two-dimensional negative-thermal-expansion phosphor and discovers enhanced green upconversion and near-infrared downshifting luminescence with increasing temperature. The investigation of the luminescence mechanism, temperature dependence of the luminescence lifetime, and the application of temperature sensing provide important insights into the design of negative-thermal-expansion phosphors.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Luiz M. M. Barreto, Davinson M. da Silva, Antonio D. Santos, Koiti Araki, Cid B. de Araujo, Luciana R. P. Kassab
Summary: Multilayer graphene (MLG) thin films were produced by depositing them on a cobalt buffer-layer prepared at 500 degrees C and subsequently thermal annealing. The annealing process allowed the transformation of amorphous carbon to graphene through diffusion and nucleation. The thicknesses of the cobalt and MLG thin films were measured as 55 and 54 nm, respectively, by atomic force microscopy. Raman spectroscopy confirmed the presence of MLG based on the intensity ratio of the 2D and G bands (I2D/IG), which was found to be 0.4 for the annealed graphene thin film. Additional analysis using transmission electron microscopy supported the Raman results. Moreover, the MLG films exhibited significant nonlinear absorption behavior at 980 nm and can be utilized as optical limiters.
Article
Optics
Josivanir G. Camara, Davinson M. Da Silva, Luciana R. P. Kassab, Cid B. De Araujo
Summary: Random lasing is observed in neodymium doped alumina lead-germanate glass powder for the first time. The samples were fabricated using a conventional melt-quenching technique and confirmed to have an amorphous structure. Excitation of the sample at 808 nm resulted in random laser emission at 1060 nm, with an excitation energy fluence threshold of 0.3 mJ/mm2. The use of large quantities of neodymium oxide in the glass did not hinder the laser emission process, despite luminescence concentration quenching.
Article
Optics
Daniel F. Luz, Rodrigo F. da Silva, Celio V. T. Maciel, Gabriela Soares, Emanuel P. Santos, Carlos Jacinto, Lauro J. Q. Maia, Bismarck C. Lima, Andre L. Moura
Summary: In recent years, an unconventional excitation method of Nd3+ ions at 1064 nm has been investigated, demonstrating a photon-avalanche-like (PA-like) mechanism that is facilitated by temperature increase. NdAl3(BO3)4 particles were used as a proof-of-concept. This mechanism enhances the absorption of excitation photons and enables light emission across a broad range of visible and near-infrared spectra. Furthermore, the PA-like mechanism has been switched on by an auxiliary beam at 808 nm for the first time, utilizing the additional heating through phonon emissions from Nd3+ relaxation pathways. These findings have potential applications in controlled heating and remote temperature sensing.
Article
Optics
Bismarck Costa Lima, Pedro Tovar, Andre L. Moura, Jean Pierre von der Weid
Summary: Replica symmetry breaking (RSB) phase transition is observed in disordered photonics systems. In a random fiber laser (RFL) with Rayleigh backscattering, RSB is observed due to the inhomogeneity of the optical fiber refractive index. The study demonstrates the connection between RSB, Levy-like behavior of intensities, and correlated laser intensity fluctuations.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Chemistry, Physical
Maxwell A. M. Nogueira, Albert S. Reyna, Helivaldo D. S. Souza, Bruno F. Lira, Petronio F. de Athayde-Filho, Cid B. B. de Araujo
Summary: We synthesized a mesoionic compound and investigated its nonlinear optical response in terms of refractive and absorptive properties in different temporal and spectral regimes. Z-scan technique was used with two pulsed light sources: a mode-locked and Q-switched Nd-YAG laser at 532 nm and a Ti: Sapphire laser system at 800 nm. The compound's nonlinear refraction, two- and three-photon absorption, and excited state absorption were observed and characterized based on a three-energy-level model, allowing the determination of the parameters that describe the nonlinear response.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Materials Science, Multidisciplinary
Luz Patricia Naranjo-Riano, Nathalia T. C. Oliveria, Camilo E. Echeverry, Luciana R. P. Kassab, Cid B. de Araujo
Summary: We synthesized and characterized PbO-Bi2O3-Ga2O3 glass-ceramics containing PbO and Bi2O3 crystallites, free Pb2+ and Bi3+ ions, and Ag-NPs. The samples were prepared using the melt-quenching method followed by heat treatment. Various techniques were used for characterization, including transmission electron microscopy, X-ray diffraction, linear optical absorption, and photoluminescence (PL). Excitation at 330 nm resulted in a large PL intensity due to Pb2+ and Bi3+. Additionally, the PL intensity was enhanced by about 1000% in samples containing Ag-NPs compared to those without Ag-NPs. This behavior is reported for the first time in heavy-metal oxide glass-ceramics, highlighting the potential for photonic applications.
Article
Materials Science, Multidisciplinary
A. L. Moura, A. A. Canabarro, E. de Lima, W. C. Soares, J. F. Carvalho, M. T. de Araujo, P. V. dos Santos
Summary: This paper investigates the recording and erasure of photorefractive holographic gratings in an undoped Bi12TiO20 (BTO) crystal sample under an externally applied electric field. The diffraction efficiency is measured without using any phase-modulation technique or feedback mechanism. An enhancement of 3.5-fold is observed when the electric field is increased from 0 to 6 kV/cm. The theoretical dependence of the diffraction efficiency on the electric field, considering charge screening near the electrodes, is supported by good fit to experimental data, and characteristic parameters of the material are computed.
Article
Optics
Andre C. A. Siqueira, Guillermo Palacios, Albert S. Reyna, Boris A. Malomed, Edilson L. Falcao-Filho, Cid B. de Araujo
Summary: We present the results of a numerical analysis comparing the efficiency of the multiple temporal compression (MTC) method with conventional methods using photonic crystal fibers (PCFs) and fused silica waveguides (FSWs) for generating multiple solitons. The analysis shows that the MTC method is more efficient in controlling soliton fission, resulting in a larger number of high-powered fundamental solitons that remain stable over long distances. The high efficiency of the MTC method is particularly evident in multiple soliton collisions and the Newton's-cradle phenomenology.
OPTICS COMMUNICATIONS
(2023)
Review
Chemistry, Multidisciplinary
Anderson S. L. Gomes, Cecilia L. A. V. Campos, Cid B. de Araujo, Melissa Maldonado, Manoel L. da Silva-Neto, Ali M. Jawaid, Robert Busch, Richard A. Vaia
Summary: In this article, we review our work on the nonlinear optical response of a series of 2D-LTMDs nanomaterials using six different NLO techniques. We studied the nonlinear response of various materials and measured the nonlinear refraction index and absorption coefficient. Theoretical support was also provided to explain the origin of the nonlinear responses.
Article
Optics
Guillermo Palacios, Andre C. A. Siqueira, Cid B. de Araujo, Anderson S. L. Gomes, Ernesto P. Raposo
Summary: In this study, the phenomenon of replica symmetry breaking (RSB) was investigated in random lasers (RLs) through Monte Carlo simulations. The study revealed that photonic random walkers diffuse and get randomly scattered in the active medium, interacting with both the population of excited atoms and each other. When the interactions among photonic walkers are not included, a replica-symmetric distribution for the Parisi overlap parameter (P(q)) at q = 0 is found for any excitation energy. The study also examined the statistical correlations of intensity fluctuations in different modes of the same spectrum, finding consistency with experimental results in RL materials.
Article
Nanoscience & Nanotechnology
Jessica E. Q. Bautista, Cecilia L. A. V. Campos, Manoel L. da Silva-Neto, Cid B. de Araujo, Ali M. Jawaid, Robert Busch, Richard A. Vaia, Anderson S. L. Gomes
Summary: We experimentally studied spatial self-phase modulation (SSPM) in liquid suspensions of various 2D materials. The intensity-dependent changes in refractive index responsible for SSPM are shown to be due to thermal effects. The measured thermal nonlinear coefficients for different suspensions are independent of the excitation regime. The use of circularly polarized light complements the results obtained with linearly polarized light.
Article
Chemistry, Physical
Manoel L. Silva-Neto, Renato Barbosa-Silva, Georges Boudebs, Cid B. de Araujo
Summary: This study determined the first hyperpolarizability of graphene quantum dots (GQDs) suspended in water using the hyper-Rayleigh scattering (HRS) technique. The results suggest that these GQDs may have potential applications in biological microscopy imaging.
Article
Materials Science, Multidisciplinary
Renato Barbosa-Silva, Mario S. S. Oliveira, Rudson C. Ferreira, Vinicius Manzoni, Eduardo H. L. Falcao, Cid B. de Araujo
Summary: Measurements and theoretical modeling of the second-order optical nonlinearity of two 1,3,4-oxadiazole derivatives, Oxa-4-Py and DiOxaBn-2-Tio, were reported. The dynamic and static first hyperpolarizability values were measured using the hyper-Rayleigh scattering technique and a density functional method. The results showed that the first hyperpolarizability of DiOxaBn-2-Tio is approximately 30% larger than that of Oxa-4-Py.
Article
Optics
Andre C. A. Siqueira, Edilson L. Falcao-Filho, Boris A. Malomed, Cid B. de Araujo
Summary: Theoretical consideration and numerical simulation of femtosecond pulse propagation in a one-dimensional composite medium reveals the generation of bright soliton trains. The paper discusses the controllable production of ultrashort temporal solitons and addresses the role of intrapulse Raman scattering and collisions between solitons with different central wavelengths.
Article
Optics
R. B. Adamov, G. A. Melentev, I. V. Sedova, S. V. Sorokin, G. V. Klimko, I. S. Makhov, D. A. Firsov, V. A. Shalygin
Summary: This study investigates the THz luminescence in doped nanostructures with GaAs/AlGaAs quantum wells under interband optical pumping. The results show that the spatial separation of donors and acceptors can greatly enhance the integrated intensity of THz emission.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yanru Li, Lei Zhong, Sha Jiang, Yutong Wang, Binyao Huang, Guotao Xiang, Li Li, Yongjie Wang, Chuan Jing, Xianju Zhou
Summary: In this study, a ratiometric luminescent thermometry based on dual-emission centers was developed using co-doped CaNb2O6 phosphors with Bi3+ and Pr3+. The obtained samples exhibited good thermosensitive and thermochromic characteristics, with a maximum absolute sensitivity of 0.09 K-1 @ 528 K and a maximum relative sensitivity of 2.17 % K-1 @ 453 K.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yujing Gong, Yeqing Wang, Zhiyuan Wang, Yijian Sun, Yi Yu
Summary: Single crystals of Dy3+ single-doped and Dy3+/Tb3+ co-doped CaYAlO4 were grown and analyzed. The incorporation of Tb3+ resulted in increased absorption and emission cross sections. The fluorescence lifetimes and branching ratios of the yellow emission were affected by the presence of Tb3+. The deactivation effect of Tb3+ ions and energy transfer mechanism were also discussed.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Lu Chen, Zhuangzhuang Ma, Jian Chen, Wang Guo
Summary: This study focuses on enhancing the thermal robustness of phosphor converter materials by preparing composite ceramics of YAG:Ce combined with high-thermal-conductivity MgO. The composite ceramics showed high density and thermal conductivity at the optimum temperature of 1400℃. Stable laser-driven white light was obtained under blue laser excitation.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yuwei Wu, Chunhui Niu, Lei Wang, Mingqing Yang, Shiyu Zhang
Summary: Er3+-doped germanate-tellurite glasses were prepared and their structure, luminescent, and temperature-sensing properties were studied. The glass exhibited large values of O2 and O6 and its luminescence intensity varied with temperature.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Kensei Ichiba, Takumi Kato, Kenichi Watanabe, Yuma Takebuchi, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida
Summary: In this study, Eu-doped YVO4 single crystals with different concentrations were fabricated to evaluate their photoluminescence and scintillation properties. The results showed that the samples doped with Eu exhibited emission peaks due to 4f-4f transitions in PL and scintillation spectra. Based on the pulse height spectra, the light yield of the Eu-doped samples increased with increasing Eu concentration, while the afterglow level decreased.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Daiwen Xiao, Hei-Yui Kai, Anjun Huang, Menglin Song, Ka-Leung Wong, Peter A. Tanner
Summary: The emission spectra of Cs2NaEuCl6 nanoparticles synthesized by the hot injection method are explained. The dispersion of the nanoparticles in alkane solvents in the experiment allows the determination of the magnetic dipole radiative rate for the D-5(0) -F-7(1) channel in vacuum, which is in agreement with the calculated value.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Italia V. Barbosa, Geraldine Dantelle, Alain Ibanez, Lauro J. Q. Maia
Summary: The thermal response and luminescence properties of different oxide matrices were evaluated to design more accurate thermal probes. It was found that thermal probes emitting in BW-II provide better thermal sensing with higher signal-to-noise ratio. Additionally, doping Nd3+ in Y2O3 matrix maximizes luminescence intensity, making it a promising matrix for thermal sensing.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Xin Li, Yu Zhang, Hongrui Ren, Lunlong Xie, Yinsheng Di, Mengqing Han, Zhaohui Bai, Quansheng Liu, Liangliang Zhang, Jiahua Zhang
Summary: This study successfully prepared phosphor samples based on Ca3-xLuxSc2-xMgxSi3O12:Ce3+ and investigated their luminescence properties. With the increase in Lu-Mg concentration, the peak of the sample redshifted, but the thermal stability gradually decreased. The LD devices made from CLSMS:Ce3+ fluorescent materials showed a decrease in cyan-green light and an increase in red light as the Lu-Mg concentration increased.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Tim Pier, Julia Hopster, Thomas Juestel
Summary: This study investigates and reports on several samples of cerium-activated gallium-based garnet phosphors. The optimal activator concentration was found to be 1 atom-%. The size of non-emitting lanthanide ions and the molar concentration of cerium strongly influenced the crystal field splitting, which in turn shaped the excitation and emission wavelengths.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Guijie Zhao, Wei Shi, Xin Xin, Fengcai Ma, Yongqing Li
Summary: This study reveals for the first time the proton transfer pathways and changes in the photophysical properties of P-TNS with three intramolecular hydrogen bonds. The reaction mechanism and driving force for the proton transfer process are explained through analysis of potential energy surface, frontier molecular orbitals, and hydrogen bond parameters, among others.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Li He, Jinshu Huang, Zhengce An, Haozhang Huang, Yu Zhao, Kexin Zhong, Bo Zhou
Summary: In this study, we designed a NaYF4:Yb3+/Tm3+@NaYF4 core-shell nanostructure to achieve thermochromic upconversion and high thermal sensitivity. We found that the blue upconversion emission of Tm3+ decreased while the deep-red emission increased with elevating temperature. The sample also showed a gradual emission color change from blue to purplish-red, and the optimal relative sensitivity reached 2.79% K-1.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Rupesh A. Talewar
Summary: A series of Li2TiO3 phosphors doped with Mn4+ and codoped with Mn4+ and Er3+ were synthesized, which demonstrated the ability of Mn4+ ions to absorb UV-Vis photons and subsequently transfer energy to Er3+ ions, resulting in the emission of near-infrared light. These materials have the potential to enhance the absorption efficiency of Er3+-based luminescent materials.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Xingyuan Ma, Jianfeng Li
Summary: Carbon quantum dots (CQDs) with tunable photoluminescence properties have been synthesized using suitable carbon and dopant sources in an aqueous system. The synthesized CQDs exhibited blue, green, yellow, and red emissions, and solid-state luminescence was achieved through the preparation of solid-state fluorescent films and phosphors. This study provides important technical support for the future development of CQDs synthesis.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
De Bin Fu, Yang Bing Xu, Yu Teng Zhang, Shan Ting Liu, Xiao Fei Yang, Sheng Hua Liu
Summary: A pair of new chiral molecules, (S)-4 and (R)-4, have been designed and synthesized by introducing valine-containing groups at symmetrical positions on the periphery of an indolo[3,2-b]carbazole unit. These molecules exhibit aggregation-induced circular dichroism (AICD) properties in DMF/water mixtures, and in a mixture with 99% water fraction, they show strong, mirror-image, blue circularly polarized luminescence (CPL) signals.
JOURNAL OF LUMINESCENCE
(2024)
