Effect of the synthesis route on the luminescence properties of Eu 3+ activated Li 6 M(BO 3 ) 3 (M = Y, Gd) phosphors

Yawalkar, Mrunal M.; Nair, Govind B.; Zade, G. D.

doi:10.1016/j.matchemphys.2016.12.006

Cited by 35 publications

(4 citation statements)

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“…This can be discovered from FESEM images, where no Eu 3+ structure can be seen in the images regardless of the concentration of Eu 3+ , which shows that Eu 3+ has been incorporated into both crystals sites. Next, the 5 D0→ 7 F0 transition at the emission peak of 578 nm belongs to the 4f-4f transitions, which is principally forbidden according to the standard selection rules of the Judd-Ofelt theory [61]. Hence, the peak should be inexistent or very weak in the PL emission spectrum, however, due to the possibility of the majority of Eu 3+ ions occupy the interstitial sites with much lower local symmetry in the ZnO/Zn2SiO4 host, hence affect to the occurrence of 5 D0→ 7 F0 transition [62,63].…”

Section: Photoluminescence (Pl) Analysismentioning

confidence: 99%

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

et al. 2021

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This research paper proposes the usage of a simple thermal treatment method to synthesis the pure and Eu3+ doped ZnO/Zn2SiO4 based composites which undergo calcination process at different temperatures. The effect of calcination temperatures on the structural, morphological, and optical properties of ZnO/Zn2SiO4 based composites have been studied. The XRD analysis shows the existence of two major phases which are ZnO and Zn2SiO4 crystals and supported by the finding in the FT-IR. The FESEM micrograph further confirms the existence of both ZnO and Zn2SiO4 crystal phases, with progress in the calcination temperature around 700–800 °C which affects the existence of the necking-like shape particle. Absorption humps discovered through UV-Vis spectroscopy revealed that at the higher calcination temperature effects for higher absorption intensity while absorption bands can be seen at below 400 nm with dropping of absorption bands at 370–375 nm. Two types of band gap can be seen from the energy band gap analysis which occurs from ZnO crystal and Zn2SiO4 crystal progress. It is also discovered that for Eu3+ doped ZnO/Zn2SiO4 composites, the Zn2SiO4 crystal (5.11–4.71 eV) has a higher band gap compared to the ZnO crystal (3.271–4.07 eV). While, for the photoluminescence study, excited at 400 nm, the emission spectra of Eu3+ doped ZnO/Zn2SiO4 revealed higher emission intensity compared to pure ZnO/Zn2SiO4 with higher calcination temperature exhibit higher emission intensity at 615 nm with 700 °C being the optimum temperature. The emission spectra also show that the calcination temperature contributed to enhancing the emission intensity.

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Section: Photoluminescence (Pl) Analysismentioning

confidence: 99%

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

et al. 2021

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“…The main emission peak was assigned to the magnetic dipole transition between the 5 D 0 and 7 F 1 levels. The MC sample exhibits a higher emission intensity due to its larger grain size, which was expected since, generally, the higher the crystallinity of the sample, the more intense emission 24 .…”

Section: Resultsmentioning

confidence: 84%

Changing the Sensitivity and Operating Range of the Ba2MgWO6 : Eu3+ Optical Thermometer by Applying the Distinct Synthesis Routes

Thq

Bondzior

Miniajluk-Gaweł

et al. 2021

Preprint

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The suitability of Ba2MgWO6 (BMW) double perovskite doped with Eu3+ for the construction of an optical thermometer was tested. It has been shown that by controlling the conditions of BMW synthesis, the sensitivity of the optical thermometer and the useful range of its work can be changed. Pure BMW and doped with Eu3+ samples were prepared using the mechano-chemical (MC) and co-precipitation (CP) methods. Both the absolute sensitivity and the relative sensitivity in relation to the synthesis route are estimated. The findings proved that the relative sensitivity can be modulated from 1.17 %K− 1 at 248 K, to 1.5%K− 1 at 120 K for the co-precipitation and the mechanochemical samples, respectively. These spectacular results confirm the applicability of the Ba2MgWO6: Eu3+ for the novel luminescent sensors in high-precision temperature detection devices. Density-functional theory (DFT) was applied to elucidate the origin of the host emission.

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“…3421 cm −1 ) and 1630 cm −1 can be attributed to atmospheric water vapor, as KBr easily absorbs moisture from the air during pellet formation. Antisymmetric stretching vibrations of free OH bonds can be attributed to these bands . The peak at 2844 cm −1 accounted for the C–H stretching mode in the CH group and the peak at 2931 cm −1 accounted for the C–H asymmetric stretching mode in the CH 2 group.…”

Section: Resultsmentioning

confidence: 98%

Study of luminescence properties of dysprosium‐doped CaAl₁₂O₁₉ phosphor for white light‐emitting diodes

Dev

Selot²,

Nair

et al. 2019

Luminescence

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Dy 3+ -doped CaAl 12 O 19 phosphors were synthesized utilizing a combustion method.Crystal structure and morphological examinations were performed respectively using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques to identify the phase and morphology of the synthesized samples. Fourier transform infrared spectroscopy (FTIR) estimations were carried out using the KBr method.Photoluminescence properties (excitation and emission) were recorded at room temperature. CaAl 12 O 19 :Dy 3+ phosphor showed two emission peaks respectively under a 350-nm excitation wavelength, centered at 477 nm and 573 nm. Dipole-dipole interaction via nonradiative energy shifting has been considered as the major cause of concentration quenching when Dy 3+ concentration was more than 3 mol%. The CIE chromaticity coordinates positioned at (0.3185, 0.3580) for the CaAl 12 O 19 :0.03Dy 3+ phosphor had a correlated color temperature (CCT) of 6057 K, which is situated in the cool white area. Existing results point out that the CaAl 12 O 19 :0.03Dy 3+ phosphor could be a favorable candidate for use in white light-emitting diodes (WLEDs). KEYWORDS aluminate, concentration quenching, Dy 3 + , photoluminescence, WLEDs | INTRODUCTIONAt the present time, the development of energy-saving lighting is an essential core interest for researchers. Large amounts of power can be saved by using efficient energy-saving light sources. Traditional incandescent and fluorescent lamps, with their resulting heat or gas release, have related colossal energy losses. [1] The use of energy proficient solid-state lighting appliances, for example compact fluorescent lamps (CFLs) and light-emitting diodes (LEDs), to deliver white light is an attractive alternative. Due to the above concern, the production of phosphors with excellent properties is an essential prerequisite. The efficacy of white light-emitting diodes (WLEDs) has surpassed that of incandescent lamps and fluorescent lamps. Due to their exceptional luminescence features, improved stability, energy-efficient nature, prominent luminescence efficiency, ecological amicability, and low cost, research into WLEDs has become more important. [2][3][4] WLEDs are mostly fabricated by applying three different techniques: (i) by making use of a mixture of red-green-blue (RGB) LEDs;(ii) through the utilization of ultraviolet (UV) LEDs to excite RGB phosphors; and (iii) by employing blue LEDs to pump single-phase yellow or blended green and red phosphors. [1,5] At the present time, blue emitting chips combined with yellow phosphors (YAG:Ce 3+ ) are acknowledged as existing industrial WLEDs. Nevertheless, inferable from red light effect insufficiency, low color rendering index and high correlated color temperature (CCT) are commonly experienced by phosphors in this group. High CCT and low color rendering index (CRI) are not good factors when providing domiciliary or office lighting. This hindrance can be resolved by utilizing tricolor WLEDs dependent on red, green, and blue phosphors [6][7][8] . This ...

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Effect of the synthesis route on the luminescence properties of Eu 3+ activated Li 6 M(BO 3 ) 3 (M = Y, Gd) phosphors

Cited by 35 publications

References 25 publications

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

Changing the Sensitivity and Operating Range of the Ba2MgWO6 : Eu3+ Optical Thermometer by Applying the Distinct Synthesis Routes

Study of luminescence properties of dysprosium‐doped CaAl₁₂O₁₉ phosphor for white light‐emitting diodes

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Effect of the synthesis route on the luminescence properties of Eu 3+ activated Li 6 M(BO 3 ) 3 (M = Y, Gd) phosphors

Cited by 35 publications

References 25 publications

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

Changing the Sensitivity and Operating Range of the Ba2MgWO6 : Eu3+ Optical Thermometer by Applying the Distinct Synthesis Routes

Study of luminescence properties of dysprosium‐doped CaAl12O19 phosphor for white light‐emitting diodes

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Study of luminescence properties of dysprosium‐doped CaAl₁₂O₁₉ phosphor for white light‐emitting diodes