Sol–gel synthesis and investigation of un-doped and Ce-doped strontium aluminates

Misevicius, Martynas; Ščit, O.; Grigoravičiūtė-Puronienė, Inga; Degutis, Giedrius; Bogdanovičienė, Irma; Kareiva, Aivaras

doi:10.1016/j.ceramint.2012.04.042

Cited by 33 publications

(16 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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 ...

show abstract

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

View full text Add to dashboard Cite

show abstract

“…1 XRD patterns of (a) titanium and (b) strontium doped mullite precursor gels sintered at 1100 ℃ with increasing doping concentration. 502 cm 1 , 580 cm 1 (AlO 6 ), 844 cm 1 (AlO 4 ) and 1136 cm 1 (Si-O stretching mode), and 1191 cm 1 and 1226 cm 1 for mullite, and for strontium aluminates (Sr 3 Al 2 O 6 ) at 1477 cm 1 at 1100 ℃ [16]. Figure 4 shows the FTIR spectra of titanium and strontium doped mullite at 1400 ℃.…”

Section: Resultsmentioning

confidence: 99%

“…We also have studied the dielectric constant, loss tangent, AC conductivity and magnetization of the mullite composites doped with varying concentrations of iron ions with different frequencies at room temperature. The results indicate that the sample of 0.01 M concentration has the highest dielectric constant 24.42 at frequency 2 MHz [15,16].…”

Section: Introductionmentioning

confidence: 91%

Abrupt change of dielectric properties in mullite due to titanium and strontium incorporation by sol-gel method

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Thermally stimulated luminescence (TSL) is the phenomenon of emission of light from a solid which has been previously exposed to ionizing radiation under conditions of increasing temperature. The band theory of solid is normally used to explain this phenomenon [24,25]. When a solid is irradiated, electrons and holes are produced.…”

Section: Thermoluminescence (Pl)mentioning

confidence: 99%

Luminescence studies of dysprosium doped strontium aluminate white light emitting phosphor by combustion route

Sahu

Bisen

Brahme

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

In the present investigation dysprosium doped strontium aluminate phosphor was prepared by combustion synthesis method. The crystal structure of the prepared phosphor was consistent with standard monoclinic phase with a space group P2 1 . According to the TEM analysis, the particle size was found to be in the nanometer range. The trap parameters which are mainly activation energy (E), frequency factor (s) and order of the kinetics (b) were evaluated by using the peak shape method. Under the ultraviolet (365 nm) excitation, photoluminescence (PL) spectra showed characteristic emission bands at 480 (blue), 573 (yellow) and 670 nm (red) due to 4

show abstract

Sol–gel synthesis and investigation of un-doped and Ce-doped strontium aluminates

Cited by 33 publications

References 61 publications

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

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

Abrupt change of dielectric properties in mullite due to titanium and strontium incorporation by sol-gel method

Luminescence studies of dysprosium doped strontium aluminate white light emitting phosphor by combustion route

Contact Info

Product

Resources

About

Sol–gel synthesis and investigation of un-doped and Ce-doped strontium aluminates

Cited by 33 publications

References 61 publications

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

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

Abrupt change of dielectric properties in mullite due to titanium and strontium incorporation by sol-gel method

Luminescence studies of dysprosium doped strontium aluminate white light emitting phosphor by combustion route

Contact Info

Product

Resources

About

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

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