Photoluminescence Characteristics of Dysprosium Doped CeO Phosphor for White Light Emission

Kaur, Jaspreet; Chandrakar, Deepika; Dubey, Vikas; Shrivastava, Ravi; Parganiha, Yogita; Suryanarayana, N. S.

doi:10.1109/jdt.2015.2503330

Cited by 16 publications

(4 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the Dy 3+ ion is placed at high symmetry local site (with inversion center) its 4 F 9/2 -6 H 15/2 blue emission could be stronger than ( 4 F 9/2 → 6 H 13/2 ) [38]. In the present work, high intensive peak was evidenced [41] showed maximum intensity in the greenish yellow wavelength region. Therefore, these samples can be used effectively as one of the component of white light emitting diodes (WLEDs) for display applications.…”

Section: Size Morphology and Constituent Of Lanthanum Aluminate Nmssupporting

confidence: 43%

E-tirucalli latex mediated green biogenic synthesized Dy3+ doped and Bi3+ co-doped nano perovskite lanthanum aluminum oxide: structure, morphology, luminescence and dielectric studies

Venkatesh¹,

Manohara

Nagaraju

et al. 2021

Eur. Phys. J. Plus

View full text Add to dashboard Cite

Perovskite structured LaAlO 3 , LaAlO3:Dy 3+ and LaAlO 3 :Dy 3+ :Bi 3+ (One mol%) nano materials were prepared by green biogenic method using of Euphorbia-tirucalli plant latex as a fuel. Rhombohedral structure with space group R 3 m having crystallite size of 18-28 nm was attained using X-ray diffraction spectra. The absorption peaks at 426 cm −1 , 677 cm −1 and 825 cm −1 for the spectral range between 840 cm −1 to 400 cm −1 would be endorsed to the characteristic metal oxide (M La and/or Al) bonding. Irregular, flakes type surface and its constituents shown by scanning electron microscopy attached with energy dispersive spectra. Band gap energy by reflectance spectra shows 2.77-3.10 eV. Luminescence property exhibits the maximum wavebands at 450-490 nm, 540-580 nm and 650-675 nm resembles to the electron transition from 4 F 9/2 → 6 H 15/2 , 4 F 9/2 → 6 H 13/2 and 4 F 9/2 → 6 H 11/2 levels, respectively, monitored at 265 nm. Also, spectra show the enhanced emission intensity when Bi 3+ ion is co-doped. Color chromaticity and correlated color temperature of 7705 K confirm the practical usage as one of the component in cool white light emitting diodes. High dielectric for LaAlO 3 and conductivity contribution measured by Cole-Cole plot indicate that the appearance of semicircle at higher frequency zone signifies the grain contribution. Also, the resistance is increased for Dy 3+ doped and Bi 3+ co-doped samples for the frequency range from 100 Hz to 8 MHz at room temperature. Hence, these materials are used in electronic storage, high frequency meter application and CMOS devices.

show abstract

Section: Size Morphology and Constituent Of Lanthanum Aluminate Nmssupporting

confidence: 43%

E-tirucalli latex mediated green biogenic synthesized Dy3+ doped and Bi3+ co-doped nano perovskite lanthanum aluminum oxide: structure, morphology, luminescence and dielectric studies

Venkatesh¹,

Manohara

Nagaraju

et al. 2021

Eur. Phys. J. Plus

View full text Add to dashboard Cite

show abstract

“…A variety of approaches were developed to achieve at the same time a single-phase, ultrafine and homogenous CeO 2 materials in the form of powder or thin films, such as: solid-state synthesis [30], sol-gel [31,32], precipitation [31,32,33,34,35,36,37], combustion [38,39,40], hydrothermal [41,42,43], solvothermal [44,45], microemulsion [46,47], electrochemical deposition [48] and so on.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and structural properties of CeO2 nanocrystals doped with La3+, Nd3+ and modified on their surface with Ag nanoparticles

Michalska

Lemański

Sikora

2021

Heliyon

View full text Add to dashboard Cite

The purpose of this work is to present our efforts focused on applications of chemical synthesis of nanocrystalline cerium dioxide (CeO 2 ) powders doped with La 3þ ions and CeO 2 :Nd 3þ modified, on their surface, with Ag nanoparticles (NPs). The synthesized powders were examined by X-ray powder diffraction (XRD), absorption, emission spectroscopy, scanning electron (SEM) and atomic force microscopy (AFM). The relations between crystallographic properties and stability of CeO 2 compounds doped by La ions and surface-modified by Ag were studied. XRD patterns revealed that all studied samples are single-phase and crystallized in the cubic fluorite-type structure, in space group Fm-3m. The average crystallite sizes estimated by Rietveld method of series: La-doped CeO 2 were in the range of 7-14 nm, and CeO 2 :1%Nd 3þ /n-Ag (n: 1-5wt.%) were found to be in the range of 29-34 nm, respectively. The lattice parameter a for La-doped CeO 2 powders varying from 5.416 to 5.482 Å with increasing content of La 3þ ions from 0 to 20wt.%, respectively. For series of CeO 2 :Nd 3þ /n-Ag materials lattice parameter a was at the same level and in accordance with the standard value a 0 ¼ 5.411 Å (ICDD -43-1002). The SEM and AFM observations depicted the grainy structure of all obtained CeO 2 -powder samples. The estimated grain size ranged from 50 to 500 nm. The diverse grain shapes and packing was remarked in the samples. According to our knowledge, the relationship between the structural, spectroscopic and morphological characteristics of CeO 2 samples was presented in this work for the first time.

show abstract

“…These ingredients, in an appropriate stoichiometric ratio, were ground properly for an approximate duration of 1 h using pastel and mortar. This ground mixture was pre-sintered at a temperature of 900 o C, and after cooling; it was put inside the furnace to be fired at a temperature of 1300 o C for almost 2 h, with H3BO3 (1.6 mol%) used as flux [11][12][13][14][15][16]. The chemical reaction (Eq.…”

Section: Methodsmentioning

confidence: 99%

Photoluminescence Studies of Europium Doped Di-Strontium Magnesium Silicate Phosphors

Shrivastava¹

2023

JMNM

Self Cite

View full text Add to dashboard Cite

This article reports the study of photoluminescence spectra of Di Strontium Magnesium Silicate (Sr2MgSi2O7) doped with various concentration of Europium (Eu3+) prepared using solid-state reaction technique. The doping concentration (s) of Eu3+ were 0.2, 0.5, 1.0, 1.5, 2.0, 2.5 mol% respectively. Excitation spectrum monitored at 620 nm wavelength that exhibited two prominent peaks centered at 256 nm and 277 nm. Peak observed at 277 nm was more intense therefore the emission spectra were monitored at 277. Emission Spectra of all the samples revealed intense peaks centred at 607, 618 and 637 are attributed to 5D0 7F2 of Europium (III) ions accommodated at various lattice sites having different energies. Overall emission was found in the red colour region which was confirmed using a CIE chromaticity diagram with coordinate (0.4805, 0.3763). Critical distance for energy transfer in the concentration, beyond which concentration quenching occurred in PL spectra, was calculated. In this case, the critical distance was found to be 19.87 Å, therefore the mechanism involved in concentration quenching of Sr2MgSi2O7 doped with 2.0 mol % of Europium (III) must be only multipole-multipole exchange whereas the exchange interaction is ineffective.

show abstract

Photoluminescence Characteristics of Dysprosium Doped CeO Phosphor for White Light Emission

Cited by 16 publications

References 39 publications

E-tirucalli latex mediated green biogenic synthesized Dy3+ doped and Bi3+ co-doped nano perovskite lanthanum aluminum oxide: structure, morphology, luminescence and dielectric studies

E-tirucalli latex mediated green biogenic synthesized Dy3+ doped and Bi3+ co-doped nano perovskite lanthanum aluminum oxide: structure, morphology, luminescence and dielectric studies

Spectroscopic and structural properties of CeO2 nanocrystals doped with La3+, Nd3+ and modified on their surface with Ag nanoparticles

Photoluminescence Studies of Europium Doped Di-Strontium Magnesium Silicate Phosphors

Contact Info

Product

Resources

About