Luminescence (Display materials, LEDs, Glass materials)
Material Science
21
Scopus Publications
110
Scholar Citations
6
Scholar h-index
4
Scholar i10-index
Scopus Publications
Synthesis and photoluminescence characterisation of Ca2La2O5:Eu3+, a novel red-emitting phosphor: a comprehensive study Kishore Kumar Aitha, D. Dinakar, Payal P. Pradhan, K. Yadagiri, K. Suresh, Naresh Degda, K.V.R. Murthy, D. Haranath Canadian Metallurgical Quarterly, 2024 ABSTRACTA novel low-melting-temperature chemical flux method was used to synthesise a Ca2La2O5 lattice doped with Eu3+ ions in the range of 0.5-2.5 mol-%. The phosphors were characterised by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, particle size distribution, photoluminescence (PL), and Fourier transform infrared spectroscopy, respectively. The PXRD pattern revealed the hexagonal crystal structure with the space group P63/m. The microstrain (ϵ) was found to not vary with different concentrations of dopant and the negative means compression in the lattice. Particles of varying sizes and irregular shapes were observed from the SEM micrographs. The EDAX mapping revealed that all the constituent elements were found to be in appropriate ratios. Interestingly, the Ca2La2O5:xEu3+ (x = 0.5-2.5 mol-%) phosphor samples were excited at 590 nm, showing a Stokes-shifted red-PL with significant intensities at 615 and 627 nm. Unconventionally, when the phosphor is excited at 590 nm, the Eu3+ ion-characteristic luminescence owing to 5D0→7FJ (J = 0, 1, 2, 3, 4) transitions are manifested. Another remarkable observation is that the PL at 627 nm corresponding to 5D0→7F3 transition was much stronger than the 615 nm emission of Eu3+ corresponding to 5D0→7F3 transition, indicating high colour purity among the available red-emitting phosphors.On a utilisé une nouvelle méthode de flux chimique de fusion à basse température pour synthétiser un réseau de Ca2La2O5 dopé avec des ions Eu3+ dans la gamme de 0.5 à 2.5% mol. On a caractérisé les luminophores par diffraction des rayons X de la poudre (PXRD), microscopie électronique à balayage (MEB), spectroscopie de rayons X à dispersion d'énergie, distribution granulométrique, photoluminescence (PL) et spectroscopie infrarouge à transformée de Fourier, respectivement. Le modèle de PXRD a révélé la structure cristalline hexagonale du cristal avec le groupe spatial P63/m obtenu à 1200°C. On a constaté que la microdéformation (ϵ) ne variait pas avec les différentes concentrations de dopant et que la valeur négative signifie une compression dans le réseau. On a observé des particules de tailles variables et de formes irrégulières à partir des micrographies du MEB. La cartographie EDAX a révélé que tous les éléments constituants se trouvaient dans les rapports appropriés. Il est intéressant de noter que les échantillons luminophores Ca2La2O5:xEu3+ (x=0.5-2.5% mol) étaient excités à 590 nm, montrant une PL-rouge décalée de Stokes avec des intensités importantes à 615 et 627 nm. De manière non conventionnelle, lorsque le luminophore est également excité à 590 nm, la luminescence caractéristique de l'ion Eu3+, due aux transitions 5D0→7FJ (J=0, 1, 2, 3, 4), se manifeste. Une autre observation remarquable est que la PL à 627 nm correspondant à la transition 5D0→7F3 était beaucoup plus forte que l'émission à 615 nm de Eu3+ correspondant à la transition 5D0→7F3, indiquant une pureté élevée de la couleur parmi les systèmes disponibles de luminophore émettant dans le rouge.KEYWORDS: Solid-state reactionphotoluminescencephosphorred-emittingPXRD Acknowledgments:The authors are highly grateful to the Director, NIT Warangal for encouraging and providing the necessary characterisation facilities to execute the research work.Author contributionsKishore Kumar Aitha: Investigation, formal analysis, drafting the manuscript, conducting measurements.D. Dinakar: Conceptualisation, Methodology, Analysis, SupervisionPayal P. Pradhan: Investigation, Formal AnalysisK. Yadagir: Analysis, MethodologyK. Suresh: Conducting Measurements and restructuring the resultsNaresh Degada: Conducting MeasurementsK.V.R. Murthy: ConceptualisationD. Haranath: Analysis, SupervisionDisclosure statementNo potential conflict of interest was reported by the author(s).Data and code availabilityData in the text will be provided upon request.
Luminescence studies of a Li2Ca1−xSiO4:xSm3+ phosphor for the generation of white light under NUV-excited phosphor converting LEDs Mocharla Purna Durga Parimala, M. C. Rao, K. Suresh, Ch. Vijay Anil Dai, K. V. R. Murthy, Vikas Dubey Luminescence, 2022 In this paper, we present new aspects of Sm3+‐doped pure Li2CaSiO4 as a suitable candidate for white light emitting diode (WLED) applications. The samples were mainly prepared using a conventional modified solid‐state synthesis technique. The structural studies were done using X‐ray diffraction and Rietveld refinement. Instruments such as a scanning electron microscope (SEM) were used to obtain information about the morphology of the as‐prepared samples. Photoluminescence (PL) analysis of phosphor samples for variable concentrations of doping ions with variable excitations were presented. When doped with Sm3+ in host Li2CaSiO4 it emitted intense blue, green and red emissions and a more intense red emission peak (605 nm) under 408 nm excitation (near‐UV–blue). Our study shows that the as‐prepared phosphor may be useful for optical devices and mainly for WLEDs. The corresponding transitions of doping ions and concentration quenching effect were studied in detail. The 1931 Commission Internationale de l'Eclairage (x, y) chromaticity coordinates showed the distribution of spectral regions calculated from PL emission spectra and this was found (0.63, 0.36) in the red region, so the phosphor may be useful for near‐UV–blue excited WLED applications.
Photoluminescence studies of 2LaPO 4 :Dy(1.5%) Eu (x) phosphors Karanukar Shakampally, Y. Aparna, K. Suresh, K. V. R. Murthy Aip Conference Proceedings, 2019 The rare earth co-dopants of Dy(1.5 mol%) and Eu(0.2,0.5,1.0,1.5 and 2.0 mol%) doped in the host material of 2LaPO4 and this phosphor is synthesized by solid state reaction method. The excitation spectra of synthesized phosphor at 595nmmonitoring were composed of a broadband and a series of sharp peaks, the strongest excitation peak at 254nm, 266nm and 395nm. The main emission spectra of samples under 254nm excitation is Eu3+ ions 5D0→7F2 electric dipole transition with a strong red light, so that the phosphors may be a better candidate for red component for white light generation in display and lamps. Powder samples were prepared by firing stoichiometric mixtures of starting materials La2O3 and 2NH4H2PO4 as raw material and activators as Dy2O3 and Eu2O3 at 1200 °C for 2 hours. The photoluminescence spectra were obtained by using a spectrofluorophotometer with an 80-W Xe lamp and 0.25-m monochromators. Slit widths were 0.05 mm for emission and 1.56 mm for excitation. The emission spectrum of Eu3+ site in 2LaPO4 shows maximum intensity at 490 nm to 617nm corresponding to 5D0→7F2 transition, and the transition of 5D0→7F1 around 595nm is observed with high intensity in this phosphor. Both excitation bands correspond to the [Eu3+ - O2−] charge-transfer transitions. It is known that the position of the [Eu3+ - O2−] charge transfer transition is more or less fixed in octahedral VI coordination but moves to lower energy with increasing Eu-O distance.
Photoluminescence studies on some MLa 2 O 4 phosphors doped with Eu 2 O 3 ion J. Kishore Babu, B. Subba Rao, K. Suresh, Mandava Sridhar, K. V. R. Murthy Aip Conference Proceedings, 2019 The present paper reports mainly on the photoluminescence studies of rare-earth (1.5 mol %) Eu3+ doped MLa2O4 (M=Mg, Ca, Sr, Ba) phosphors synthesized by the standard solid state reaction method. The structure, morphology of the phosphors was characterized by X-ray diffraction, scanning electron microscopy and infrared spectroscopy. The results show that the distribution of the pure phase particles after annealing at 1200°C was irregular, highly agglomerated, small size of particles are 0.1 µm to 0.2 µm. Luminescence properties of MLa2O4: Eu3+ is investigated by the excitation and emission spectroscopy in the room temperature region. The excitation spectra of synthesized phosphors at 627nm monitoring were composed of a broadband at 277nm with high intensity which is attributed to CT band and a series of sharp peaks with less intensity at 395 nm, the secondly at 467nm is observed are assigned to f-f transitions of Eu ion. The emission spectra of prepared phosphors had transitions of Eu3+ ions i.e. 5D0 → 7F2 (467 nm), 5D0 → 7F1 (540 nm), 5D0 → 7F1 (590 nm), 5D0 → 7F2 (614–618, 628–629 nm). It was indicated that MLa2O4: Eu3+ phosphor matching with the wide spread applied the output wavelengths of UV LED and blue LED chips. The main emission spectra of samples under blue light excitation is Eu3+ ions 5D0→7F3 electric dipole transition with a strong red light, so that the MLa2O4: Eu3+ phosphor may be a better candidate for red component for white LED. The prepared materials had bright red emitting optical properties that could be suitably applied in various display devices.
Physical, structural and optical properties of chromium doped antimony borate glass system Ch. Vijay Anil Dai, K. Suresh, T. Niranjan Kumar, Ch. Srinivasu, K. V. R. Murthy Aip Conference Proceedings, 2019 Binary Glass system with the composition 40Sb2O3-(60-x) B2O3: xCr2O3 for x = 0.1, 0.3 and 0.5 mol % were prepared by the melt-quenching technique. The prepared glass samples were characterized by XRD, FTIR, EPR, PL and Optical absorption spectra. The physical properties were also studied. From the XRD studies the glass samples were amorphous in nature. From the FTIR spectra it is observed that the % of transmittance decreased with the increase of dopant concentration. From the EPR spectra of pure and Cr3+ doped antimony borate glasses, two principal resonance lines are observed. The first is a broad asymmetric band at low magnetic field with an effective g value of 4.2281 and the second is a broad asymmetric line at high magnetic field with an effective g value of 1.9716. No EPR signal was detected for the pure glass, which indicates that the pure glass is free of paramagnetic impurities. Optical absorption and luminescence spectra of all the glasses were recorded at room temperature. From the observed absorption edges optical band gap, the Urbach energies were calculated. The optical band gap is found to decrease with the concentration of Cr2O3. The luminescence spectra exhibited conventional near infra-red emission bands at around 789, 845 nm under 420 and 460 nm excitation wavelength.Binary Glass system with the composition 40Sb2O3-(60-x) B2O3: xCr2O3 for x = 0.1, 0.3 and 0.5 mol % were prepared by the melt-quenching technique. The prepared glass samples were characterized by XRD, FTIR, EPR, PL and Optical absorption spectra. The physical properties were also studied. From the XRD studies the glass samples were amorphous in nature. From the FTIR spectra it is observed that the % of transmittance decreased with the increase of dopant concentration. From the EPR spectra of pure and Cr3+ doped antimony borate glasses, two principal resonance lines are observed. The first is a broad asymmetric band at low magnetic field with an effective g value of 4.2281 and the second is a broad asymmetric line at high magnetic field with an effective g value of 1.9716. No EPR signal was detected for the pure glass, which indicates that the pure glass is free of paramagnetic impurities. Optical absorption and luminescence spectra of all the glasses were recorded at room temperature. From the observed ab...
Synthesis and photoluminescence characterisation of Ca 2 La 2 O 5 :Eu 3+ , a novel red-emitting phosphor: a comprehensive study KK Aitha, D Dinakar, PP Pradhan, K Yadagiri, K Suresh, N Degda, ... Canadian Metallurgical Quarterly 63 (4), 1070-1078 , 2024 2024 Citations: 2
Taguchi method to enhance the surface roughness G Bhavani, VN Sudha, KS Raghuram, K Suresh, PV Kumar INTERNATIONAL CONFERENCE ON SMART MATERIALS AND STRUCTURES, ICSMS-2022 2810 … , 2023 2023 Citations: 1
Heat transfer through different vessels using CFD analysis VN Sudha, KS Raghuram, G Bhavani, K Suresh, PV Kumar INTERNATIONAL CONFERENCE ON SMART MATERIALS AND STRUCTURES, ICSMS-2022 2810 … , 2023 2023
Luminescence studies of a Li 2 Ca 1-x SiO 4 :xSm 3+ phosphor for the generation of white light under NUV-excited phosphor converting LEDs (vol 37, 1284, 2022) MPD Parimala, MC Rao, K Suresh, C Anil Dai, KVR Murthy, V Dubey LUMINESCENCE 38 (4), 514-514 , 2023 2023
Luminescence studies of a Li 2 Ca 1−x SiO 4 :xSm 3+ phosphor for the generation of white light under NUV‐excited phosphor converting LEDs MPD Parimala, MC Rao, K Suresh, CV Anil Dai, KVR Murthy, V Dubey Luminescence 37 (8), 1284-1289 , 2022 2022 Citations: 1
Novel red phosphor for LED applications JK Babu, M Sridhar, ASS Prasad, G Patrick, K Suresh Materials Today: Proceedings 44, 294-299 , 2021 2021 Citations: 7
GEOMETRICAL INFLUENCE ON STABILITY OF FGM BEAMS UNDER VIBRATION KSR RAM, G BHAVANI, K SURESH, VVK LAKSHMI, T ROUT INTERNATIONAL JOURNAL 9 (4), 2027-2033 , 2020 2020
Potentiality of backyard poultry farming to enhance the income of farm women-a case study R Anitha, G Bhavani, SS Ali, R Kumar, KK Suresh, A Masthanaiah INDIAN JOURNAL OF PURE & APPLIED BIOSCIENCES Учредители: Vital Biotech 8 (6 … , 2020 2020 Citations: 1
SOLAR POWERED ROBOTIC SEED SOWING AGRIBOT USING LINEAR ACTUATOR. K Suresh, RA Kumar, M Haridoss, K Gokul i-Manager's Journal on Electronics Engineering 10 (2) , 2019 2019
Synthesis and Photoluminescence Studies of Rare Earth Doped [1.5%] CaO JC Sharma, K Suresh, YH Gandhi, KVR Murthy i-Manager's Journal on Material Science 7 (3), 37 , 2019 2019 Citations: 1
Physical, structural and optical properties of chromium doped antimony borate glass system CVA Dai, K Suresh, TN Kumar, C Srinivasu, KVR Murthy AIP Conference Proceedings 2104 (1), 020052 , 2019 2019 Citations: 2
Photoluminescence studies of 2LaPO 4 :Dy(1.5%) Eu (x) phosphors K Shakampally, Y Aparna, K Suresh, KVR Murthy AIP Conference Proceedings 2104 (1), 020057 , 2019 2019
Photoluminescence studies on some MLa 2 O 4 phosphors doped with Eu 2 O 3 ion JK Babu, BS Rao, K Suresh, M Sridhar, KVR Murthy AIP Conference Proceedings 2104 (1), 030022 , 2019 2019
3Photoluminescence study of activator ions (Eu, Tb) co-doped in different host environments (CaO, CaSiO3, CaAl2O4 and CaSiAl2O6) JK Babu, BS Rao, K Suresh, M Sridhar, KVR Murthy Materials Today: Proceedings 18, 2530-2539 , 2019 2019 Citations: 4
Novel photoluminescent behavior of Gd3+ ion in LAG host phosphor Prepared via solid state reaction method GL Sudharani, K Suresh, KVR Murthy, B SubbaRao International Journal of Luminescence and Applications 6 (4), 272-277 , 2017 2017 Citations: 1
Blue excitable green emitting Ce 3+ doped CaS phosphor for w‐LEDs K Suresh, NV Poornachandra Rao, KVR Murthy Luminescence 31 (1), 179-182 , 2016 2016 Citations: 9
Photoluminescence study of Dy3+ doped SrCeVO5 phosphor K Suresh, CVA Dai, KVR Murthy Proceedings of the twenty second national conference on luminescence and its … , 2016 2016
Synthesis and Luminescence Studies of Eu doped AlSrLaO4 Phosphor PS Raju, K Suresh, KVR Murthy, DS Rao, BS Rao Synthesis 4 (5), 24-29 , 2015 2015
nUV Excitable Red Emitting Eu3+ Doped Alkali Earth Silicate Phosphor for Solid State Lighting K Suresh, KV Babu, KS Rao, KN Kumar, NVP Rao, KVR Murthy International Journal of Luminescence and Applications 5 (2), 229-233 , 2015 2015 Citations: 1
Synthesis and characterization of nano Sr2CeO4 doped with Eu and Gd phosphor K Suresh, KVR Murthy, CA Rao, NVP Rao, BS Rao Journal of luminescence 133, 96-101 , 2013 2013 Citations: 29
Rare Earth Doped Alkali Earth Sulfide Phosphors for White‐Light LEDs K Suresh, KVR Murthy, C Atchyutha Rao, NV Poornachandra Rao International Scholarly Research Notices 2011 (1), 392917 , 2011 2011 Citations: 15
Photoluminescent properties of Sr 2 CeO 4 : Eu 3+ and Sr 2 CeO 4 : Eu 2+ phosphors suitable for near ultraviolet excitation K Suresh, NV Poornachandra Rao, KVR Murthy Bulletin of Materials Science 37 (6), 1191-1195 , 2014 2014 Citations: 11
Effect of flux on the formation of Sr2CeO4 phosphor doped with Er KVR Murthy, BN Rao, BN Rajasekhar, BWR Kumar, K Suresh, BS Rao Physics Procedia 29, 65-69 , 2012 2012 Citations: 11
Blue excitable green emitting Ce 3+ doped CaS phosphor for w‐LEDs K Suresh, NV Poornachandra Rao, KVR Murthy Luminescence 31 (1), 179-182 , 2016 2016 Citations: 9
Novel red phosphor for LED applications JK Babu, M Sridhar, ASS Prasad, G Patrick, K Suresh Materials Today: Proceedings 44, 294-299 , 2021 2021 Citations: 7
3Photoluminescence study of activator ions (Eu, Tb) co-doped in different host environments (CaO, CaSiO3, CaAl2O4 and CaSiAl2O6) JK Babu, BS Rao, K Suresh, M Sridhar, KVR Murthy Materials Today: Proceedings 18, 2530-2539 , 2019 2019 Citations: 4
Synthesis, characterization and photoluminescence study of Sr2CeO4: Eu3+ phosphor CA Rao, K Suresh, KVR Murthy, NVP Rao Der pharma chem 3, 174-181 , 2011 2011 Citations: 4
Synthesis and photoluminescence characterisation of Ca 2 La 2 O 5 :Eu 3+ , a novel red-emitting phosphor: a comprehensive study KK Aitha, D Dinakar, PP Pradhan, K Yadagiri, K Suresh, N Degda, ... Canadian Metallurgical Quarterly 63 (4), 1070-1078 , 2024 2024 Citations: 2
Physical, structural and optical properties of chromium doped antimony borate glass system CVA Dai, K Suresh, TN Kumar, C Srinivasu, KVR Murthy AIP Conference Proceedings 2104 (1), 020052 , 2019 2019 Citations: 2
Synthesis and photoluminescence tudy of Ca3Si3O8F2, Ca5Si2O8F2and Ca7Si3O12F2 doped with Ce, Eu and Tb containing fluorine. K Suresh, KVR Murthy, NV Poornachandra Rao, B Subba Rao International Journal of Luminescence and Applications 1, 52-55 , 2011 2011 Citations: 2
Rare earth doped alkali earth sulfide phosphors for white-light LEDs, Int K Suresh, KVR Murthy, CA Rao, NVP Rao Sch. Res. Netw, ISRN Condens. Matter Phys , 2011 2011 Citations: 2
Taguchi method to enhance the surface roughness G Bhavani, VN Sudha, KS Raghuram, K Suresh, PV Kumar INTERNATIONAL CONFERENCE ON SMART MATERIALS AND STRUCTURES, ICSMS-2022 2810 … , 2023 2023 Citations: 1
Luminescence studies of a Li 2 Ca 1−x SiO 4 :xSm 3+ phosphor for the generation of white light under NUV‐excited phosphor converting LEDs MPD Parimala, MC Rao, K Suresh, CV Anil Dai, KVR Murthy, V Dubey Luminescence 37 (8), 1284-1289 , 2022 2022 Citations: 1
Potentiality of backyard poultry farming to enhance the income of farm women-a case study R Anitha, G Bhavani, SS Ali, R Kumar, KK Suresh, A Masthanaiah INDIAN JOURNAL OF PURE & APPLIED BIOSCIENCES Учредители: Vital Biotech 8 (6 … , 2020 2020 Citations: 1
Synthesis and Photoluminescence Studies of Rare Earth Doped [1.5%] CaO JC Sharma, K Suresh, YH Gandhi, KVR Murthy i-Manager's Journal on Material Science 7 (3), 37 , 2019 2019 Citations: 1
Novel photoluminescent behavior of Gd3+ ion in LAG host phosphor Prepared via solid state reaction method GL Sudharani, K Suresh, KVR Murthy, B SubbaRao International Journal of Luminescence and Applications 6 (4), 272-277 , 2017 2017 Citations: 1
nUV Excitable Red Emitting Eu3+ Doped Alkali Earth Silicate Phosphor for Solid State Lighting K Suresh, KV Babu, KS Rao, KN Kumar, NVP Rao, KVR Murthy International Journal of Luminescence and Applications 5 (2), 229-233 , 2015 2015 Citations: 1
