Article
Materials Science, Multidisciplinary
Rajan Singh, M. Manhas, A. K. Bedyal, F. Durani, H. C. Swart, Vinay Kumar
Summary: CaSr2(PO4)2:Eu3+ phosphors prepared using a low-cost solution combustion method show intense orange and red emissions, making them suitable for non-contact optical thermometry and solid-state lighting applications. These phosphors exhibit high sensitivity at low temperatures.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Optics
Vishav Deep Sharma, Pooja Khajuria, Ram Prakash, R. J. Choudhary
Summary: This research article focuses on the synthesis and characterization of Na(1_ x)Zr2Smx(PO4)(3) (x = 0.005-0.05) phosphors. The phase purity, lattice parameters, chemical states, and morphology of the synthesized phosphors were thoroughly investigated. The study identified a strong characteristic emission from Sm3+ ions and extensively explored the effect of doping concentration on the photoluminescence spectra. The bandgap of the phosphors was measured and found to be in the range of 4.25 - 4.56 eV.
Article
Chemistry, Physical
Ruitong Song, Youkui Zheng, Hong Li, Yong Mao, Kai Xiong, Jing Zhu
Summary: In this study, dysprosium activators were doped into barium tellurooxyphosphate to improve luminescent performance, and alkali metal ions were used as charge compensators. The optical absorption behavior and enhanced emission intensity of the phosphor were investigated. The study reveals that the doped phosphor shows promise as a yellow-emitting candidate for white light-emitting diodes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Pawan Kumar, Devender Singh, Isha Gupta, Sitender Singh, Vinod Kumar
Summary: In this study, a gel-combustion process was used to synthesize perovskite based Gd1-xAlO3:xSm3+ (x = 0.01, 0.03, 0.05, 0.07 and 0.09 mol) nanomaterials which emit reddish orange light. The crystallographic investigation revealed that the synthesized nanocrystalline materials have orthorhombic crystal symmetry with space group Pnma (62). TEM analysis confirmed the presence of non-uniform agglomerated particles in the nano range (35-45 nm), consistent with the XRD analysis. The PL spectra showed 4f-transitions of trivalent samarium ions and the energy transfer mechanism between neighboring samarium ions was found to be dipole-dipole interaction. Colorimetric characteristics such as color coordinates, color-purity and correlated color temperature were obtained using PL data, suggesting these nanophosphor samples are highly suitable for solid state lighting applications.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Pawan Kumar, Sitender Singh, Isha Gupta, Anjli Hooda, Vinod Kumar, Devender Singh
Summary: Reddish-orange emitting Gd3-xAl5O12:xSm(3 +) (x = 0.01-0.05) nanophosphors were synthesized via a cost-effective and rapid urea-assisted gel-combustion method. The synthesized samples exhibited desirable structural and optical properties. The optimized sample demonstrated excellent luminous performance, making it a promising candidate for lighting applications.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Engineering, Electrical & Electronic
C. M. Nandanwar, N. S. Kokode, A. N. Yerpude, S. J. Dhoble
Summary: The synthesis of LaPO4:RE (RE = Dy3+, Eu3+, Sm3+) phosphors via a wet chemical method was reported. XRD characterization and photoluminescence studies were conducted. Different transitions were observed for each RE-doped phosphor under UV or visible light excitation. The results suggest their potential applications in n-UV-excited solid-state lighting.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Analytical
Atul N. Yerpude, Dalesh M. Parshuramkar, Vijay B. Pawade, Namdeo S. Kokode, Sanjay J. Dhoble
Summary: Different concentrations of rare earth Sm3+- and Dy3+-activated MgCaAl10O17 phosphors were synthesized using the combustion route and their detailed luminescence investigations are reported in this paper. The results show that the prepared phosphors have multiple excitation peaks in the ultraviolet light region and can be suitable for eco-friendly solid-state lighting applications.
Article
Chemistry, Physical
Rajan Singh, A. K. Bedyal, M. Manhas, H. C. Swart, Vinay Kumar
Summary: A series of Sm3+ doped and Li+/Na+/K+ co-doped CaSr2(PO4)(2) phosphors were synthesized and investigated for their luminescence and thermometric properties. The results showed that co-doping with alkali metal ions significantly enhanced the fluorescence intensity and the phosphors exhibited high thermal stability and good temperature sensitivity. These phosphors have potential applications in high power light emitting diodes and optical thermometry.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Qi Wang, Shangwei Wang, Ran Pang, Taixing Tan, He-rui Wen, Su Zhang, Hongpeng You, Chengyu Li, Hongjie Zhang
Summary: In this study, a new orange-red phosphor Li2La1-xTiTaO7:xSm(3+) was synthesized for white light-emitting diodes (w-LEDs). The crystal structure, microstructure, photoluminescence characteristics, luminescence lifetime, and thermal quenching properties of LLTT:Sm3+ were investigated. The LLTT:Sm3+ phosphor exhibited four intense emission peaks at 563, 597, 643, and 706 nm under excitation at 407 nm. Thermal quenching was attributed to the dipole-quadrupole interaction of Sm3+ ions, with an optimal doping concentration of x = 0.05. Moreover, the LLTT:0.05Sm(3+) phosphor showed a high overall quantum yield (QY = 59.65%) and minimal thermal quenching. The emission intensity at 423 K retained 101.5% of the initial value at 298 K, while the CIE chromaticity coordinates remained almost unchanged with increasing temperature. The fabricated white LED device exhibited excellent CRI and CCT values of 90.4 and 5043 K, respectively. These findings highlight the potential of LLTT:Sm3+ phosphor in w-LED applications.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Sadaf Gauhar M. Mushtaque, Abhijeet R. Kadam, S. J. Dhoble
Summary: Fluoride based phosphors are valuable in the field of luminescence, especially in display devices and WLED applications. In this study, a series of Sm3+, Eu3+ activated/co-activated Sr6Ca4(PO4)F2 phosphors were prepared using the combustion method and citric acid as a fuel. The crystalline nature of the samples was confirmed through XRD characterization, while the morphological and elemental analyses were conducted using SEM and EDS. The vibrational features of the phosphors were confirmed by FTIR analysis. The photoluminescence properties showed color tunability from orange to red with co-doping of Sm3+ and Eu3+ ions, and the color purity was observed to be 99.15%. These results suggest that the Sm3+, Eu3+ activated/co-activated Sr6Ca4(PO4)6F2 phosphors are potential candidates for WLED and display device applications. (c) 2022 Elsevier B.V. All rights reserved.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Engineering, Electrical & Electronic
Bingjie Han, Jiabao Zhu, Chu Chu, Xinghua Yang, Yuhan Wang, Kairan Li, Yuting Hou, Kang Li, Nigel Copner, Pingping Teng
Summary: This paper comprehensively analyzes novel Sm3+ and Sm3+-Mn4+ activated Sr2GdTaO6 (SGTO) red phosphors for plant growth and optical temperature sensing. The phase, luminescence property, and thermal stability of the material were tested. The results indicate that Sm3+-Mn4+ activated SGTO red phosphor is a luminescent material with potential application in the field of plant growth and optical temperature sensing.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Materials Science, Multidisciplinary
Bhuneshwar Verma, R. N. Baghel, D. P. Bisen, N. Brahme, V. Jena
Summary: A series of Eu3+ activated KZP phosphors were synthesized and their phase structure, luminescence properties, decay lifetime, and thermally stimulated luminescence (TSL) properties were investigated. The optimal doping concentration of Eu3+ was found to be 2 mol%, and the energy transfer mechanism between Eu3+ ions was dominated by dipole-dipole interaction. The prepared phosphors showed potential for lasing and photonic applications.
Article
Chemistry, Inorganic & Nuclear
H. B. Premkumar, Akshay Arjun, M. V. Sharvani, S. C. Sharma, H. Nagabhushana, G. P. Darshan
Summary: This study successfully explores orange-red emitting double perovskite structured Sm3+ (1-11 mol %) -doped Ba2ZnWO6 nanophosphors synthesized via a self-igniting solution combustion route and confirms their suitability as favorable candidates for solid-state lighting applications.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Optics
Vijay Singh, Yatish R. Parauha, S. J. Dhoble, Venkata Krishnaiah Kummara, N. Ravi
Summary: The orange light-emitting CaZr4(PO4)6:Sm3+ phosphors were prepared and characterized using a facile co-precipitation process. The photoluminescence emission spectra showed strong emissions at various wavelengths under 399 nm excitation, with maximum intensity observed at 0.07 mol Sm3+ concentration. The phosphors exhibited promising orange-emitting properties suitable for enhancing color index in WLEDs.
Article
Optics
Pawan Kumar, Devender Singh, Isha Gupta, Sitender Singh, Simran Nehra, Ramesh Kumar
Summary: Sm3+ activated Y4Al2O9 nanophosphors were synthesized using urea aided gel-combustion route. The nanosamples exhibit monoclinic crystal structure with P21/c space group. Under excitation at 406 nm, the Y4Al2O9:Sm3+ nanophosphor emits reddish-orange light with emission peaks at 566 nm, 602 nm, and 651 nm corresponding to transitions 4G5/2 -> 6H 5/2, 6H 7/2, and 6H 9/2, respectively. The optimal dopant concentration is observed to be 3 mol%, and dipole-quadruple interactions among dopant ions contribute to concentration quenching. Evaluation of chromaticity parameters, color temperature, and color purity suggests the potential applicability of these nanophosphors for indoor lighting applications.
JOURNAL OF LUMINESCENCE
(2023)
