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Browsing by Author "Sreena, T S"

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Color Tunable Pigments with High NIR Reflectance in Terbium-Doped Cerate Systems for Sustainable Energy Saving Applications

Athira, K V R; Rao, P P; Sreena, T S (American Chemical Society, 2019-04-15)

Color tunable pigments from yellow to red hues were developed in Tb-doped A2CeO4 (A = Sr and Ba) system by the conventional ceramic route. The developed pigments were analyzed for their phase purity, chemical oxidation ...
Control of Defect Formation and Ordering in Eu3+ Doped RE2Ce2O7 (RE = La, Y, and Gd) Red Phosphor

Raj, A K V; Rao, P P; Sreena, T S (AIP Publishing, 2020-06-28)

The control of defect formation and ordering in the lattice on the photoluminescence properties of Eu3+ doped RE2Ce2O7 is studied by the incorporation of some rare earth elements (RE = Y, La, Gd) in the system. Structural ...
Effect of Host Structure on the Photoluminescence Properties of Ln3TaO7:Eu3+ Red Phosphors

Linda Francis, T; Prabhakar Rao, P; Mahesh, S K; Sreena, T S; Parvathi Babu, S (Elsevier, 2016-02)

Eu3+ doped Ln3TaO7 (Ln = La, Gd, Y, Lu) red phosphors were prepared using a solid state route. The Ln3+ substitution induces variation of crystalline structure from a defect fluorite to weberite types with increased ordering ...
Enhanced Near Infrared Reflectance with Brilliant Yellow Hues in Scheelite Type Solid Solutions, (LiLaZn)1/3MoO4−BiVO4 for Energy Saving Products

Aju Thara, T R; Prabhakar Rao, P; Divya, S; Athira, K V R; Sreena, T S (American Chemical Society, 2017-06)

Enhanced near infrared (NIR) solar reflectance with interesting yellow hues in a new series of scheelite type solid solutions, [(LiLaZn)x/3Bi1−x][MoxV1−x]O4 (x = 0, 0.1, 0.2, 0.3, 0.4) were synthesized via conventional ...
Exploitation of Eu3+ Red Luminescence Through Order–Disorder Structural Transitions In Lanthanide Stannate Pyrochlores For Warm White LED Applications

Sreena, T S; Prabhakar Rao, P; Athira, K V Raj; Aju Thara, T R (The Royal Society of Chemistry, 2018-11)

Eu3+ ions epitomize excellent structural probes for the detection of disorder induced by structural variations in stannate pyrochlores due to their relatively simple energy level structure. In this context, we have ...
Influence of Morphology on Luminescence Properties of Xenotime-type Phosphors NaYP2O7:Eu3+ Synthesized via Solid State and Citrate-gel Routes

Sreena, T S; Prabhakar Rao, P; Ajmal, K N; Athira, K V R (Springer, 2018-05)

A series of Eu3+ activated xenotime type rare earth phosphate NaYP2O7 based orange–red emitting phosphors have been prepared via solid state (SS) and citrate gel (CG) methods. The morphological variation of the developed ...
Narrow-band Red-emitting Phosphor, Gd3Zn2Nb3O14:Eu3+ with High Color Purity for Phosphor-converted White Light Emitting Diodes

Sreena, T S; Prabhakar Rao, P; Athira, K V R; Aju Thara, T R (Elsevier, 2018-06-30)

In this work, we synthesized and characterized a narrow band red emitting Gd3Zn2Nb3O14:Eu3þ phosphor in order to improve the color qualities of warm white light emitting diodes. The phosphors were synthesized via conventional ...
Novel Molybdenum based Pyrochlore Type Red Phosphors, NaGd1−xSnMoO7: xEu3+ under Near UV and Blue Excitation

Reshmi, V R; Prabhakar Rao, P; Athira, K V R; Sreena, T S (Elsevier, 2017-10)

Novel molybdenum based pyrochlore type red emitting phosphor materials: NaGd1−xSnMoO7: xEu3+ were prepared by the conventional solid state route. The developed phosphors were characterized for their structure as well as ...
Novel red phosphors Gd2GaTaO7:Eu3+,Bi3+ for white LED applications

Linda Francis, T; Prabhakar Rao, P; Mahesh, S K; Sreena, T S; Parvathi Babu, S (Springer, 2015)

Novel red phosphor materials Gd2-x-y GaTaO7:xEu(3+),yBi(3+) were prepared using a high temperature solid state reaction route. Crystalline structure, morphology, absorbance and photoluminescence properties were studied ...
Pigmentary Colors from Yellow to Red in Bi2ce2o7 by Rare Earth Ion Substitutions as Possible High NIR Reflecting Pigments

Athira, K V R; Rao, P P; Sreena, T S; Thara, T R A (ScienceDirect, 2019-01)

A new series of high near-infrared (NIR) reflecting pigments with colors ranging from yellow to red by tuning the Bi2Ce2O7 with rare earth ion substitutions on both A and B sites were synthesized by a solid state reaction ...
Pigmentary colors from yellow to red in Bi2Ce2O7 by rare earth ion substitutions as possible high NIR reflecting pigments

Athira, K V R; Prabhakar Rao, P; Sreena, T S; Aju Thara, T R (Elsevier, 2018-09)

A new series of high near-infrared (NIR) reflecting pigments with colors ranging from yellow to red by tuning the Bi2Ce2O7 with rare earth ion substitutions on both A and B sites were synthesized by a solid state ...
Remarkable changes in the photoluminescent properties of Y2Ce2O7:Eu(3+) red phosphors through modification of the cerium oxidation states and oxygen vacancy ordering

Athira Raj, K V; Prabhakar Rao, P; Sreena, T S; Sameera, S; Vineetha James; Renju, U A (Royal Society of Chemistry, 2014)

A new series of red phosphors based on Eu(3+)-doped yttrium cerate [Y1.9Ce2O7:0.1Eu(3+), Y2Ce1.9O7:0.1Eu(3+) and Y2Ce2-xO7:xEu(3+) (x = 0.05, 0.10, 0.15, 0.20, 0.25 and 0.50)] was prepared via a conventional solid-state ...
Strong Narrow Red Emission in a Perturbed Fergusonite System: Y3Mg2Nb3O14:Eu3+ for White LED Applications

Sreena, T S; Rao, P P; Raj, A K; Thara, TRA (Springer, 2020-04)

A series of intense red-emission phosphors, Y3Mg2Nb3O14:Eu3+, with higher color purity were prepared via the conventional high-temperature ceramic route. The influence of Mg2+ ion incorporation in the highly symmetrical ...
Structural and photoluminescence properties of stannate based displaced pyrochlore-type red phosphors: Ca3-xSn3Nb2O14:xEu(3+)

Sreena, T S; Prabhakar Rao, P; Linda Francis, T; Athira Raj, K V; Parvathi Babu, S (Royal Society of Chemistry, 2015)

New stannate based displaced pyrochlore-type red phosphors, Ca3-xSn3Nb2O14:xEu(3+), were prepared via a conventional solid state method. The influence of partial occupancy of Sn in both A and B sites of the pyrochlore-type ...
Structural influence on the photoluminescence properties of Eu(3+) doped Gd3MO7 (M = Nb, Sb, and Ta) red phosphors

Linda Francis, T; Prabhakar Rao, P; Mariyam Thomas; Mahesh, S K; Reshmi, V R; Sreena, T S (Royal Society of Chemistry, 2014)

New red phosphor materials of general formula Gd3-xMO7:xEu(3+) (M = Nb, Sb, and Ta) were prepared using a high temperature solid state reaction route. Detailed structural studies using XRD, FT-IR and Raman spectroscopic ...
Studies on the Photoluminescent Properties of a Single Phase White Light Emitting Phosphor CaLa1-xNbMoO8: X Dy3+ for pc-White LED Applications

Babu, P S; Prabhakar Rao, P; Mahesh, S K; Linda Francis, T; Sreena, T S (Elsevier, 2016-05-01)

Dy3+ doped CaLa1−xNbMoO8 (x=0.02, 0.025, 0.03, 0.035, 0.05, 0.075) phosphors were synthesized using a high temperature solid state method. Powder XRD results confirm the tetragonal phase and detailed investigations on the ...
Synthesis and Photoluminescence Properties of Eu3+ Based Reel Phosphors for White Light Emitting Diode (WLED) Applications

Sreena, T S (Material Science and Technology Division, National Institute For Interdisciplinary Science and Technology (CSIR),Thiruvananthapuram, 2018-09)

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