Recent progress in multicolor tuning of rare earth-doped gadolinium aluminate phosphors GdAlO3

Sajwan, Reena K.; Tiwari, Samit; Harshit, Tulika; Singh, Ajaya Kumar

doi:10.1007/s11082-017-1158-5

Cited by 8 publications

(3 citation statements)

References 101 publications

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“…Typically, perovskite-type rare-earth aluminates with ABO 3 structures consist of some characteristic bands in the lowfrequency region of 400-1000 cm −1 [12]. However, all the recorded spectra did not show these characteristic bands, which are expected to appear at 670 and 460 cm −1 in the case of GdAlO 3 NPs [8]. Even after optimizing various reaction parameters, including varying the concentration of the reactants (0.1Gd/0.9Al, 0.3Gd/0.7Al, and 0.5Gd/0.5Al), calcination temperature, and type of surfactants, the reactions did not succeed; this was clearly indicated by the IR spectra.…”

Section: Solid-state Reactionmentioning

confidence: 89%

“…e synthesis of GdAlO 3 is often challenging and usually carried out by solid-state reaction of Gd 2 O 3 and Al 2 O 3 at elevated temperatures [7]. However, this technique usually requires extensive mixing of materials or vigorous grinding and high temperatures, which may negatively impact the microstructure of the resultant material [8]. erefore, GdAlO 3 has also been prepared using different wet-chemical methods such as, polymerized complex route, combustion synthesis, and sol-gel process [9].…”

Section: Introductionmentioning

confidence: 99%

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A Study and Comparison of the Preparation of Gadolinium Aluminate Nanoparticles Using γ‐Irradiated and Unirradiated Precursors

Al-Muhimeed

Al‐Kahtani

Mahfouz

et al. 2018

Advances in Materials Science and Engineering

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The effects of γ-irradiation and the application of different precursors on the formation of gadolinium aluminate (GdAlO3) nanoparticles (NPs) have been studied in detail. GdAlO3 NPs were prepared by using different gadolinium-based precursors including gadolinium acetate (Gd(CH3COO)3·4H2O) and gadolinium nitrate (Gd(NO3)3·6H2O), while Al2O3 and Al(NO3)3·9H2O were used as the source of Al3+. The preparation of GdAlO3 was carried out by two different methods, solid-state reaction and sol-gel process. To study the effect of γ-irradiation, both irradiated and unirradiated Gd(CH3COO)3·4H2O have been tested for the preparation of gadolinium aluminate (GdAlO3). Notably, Gd(CH3COO)3·4H2O did not produce GdAlO3 in both solid-state and sol-gel processes even after optimizing various parameters, including the application of γ-irradiation. However, single-phase nanocrystalline GdAlO3 NPs were successfully obtained from the reaction of gadolinium nitrate Gd(NO3)3·6H2O and Al(NO3)3·9H2O by a sol-gel process. The formation of NPs has been confirmed by X-ray diffraction analysis (XRD) and Fourier-transform infrared (FT-IR) spectroscopy. The results indicate towards the formation of an orthorhombic perovskite structure of GdAO3 in the Pbnm space group. Transmission electron microscopy (TEM) has been employed for the particle-size analysis, which revealed the formation of spherical-shaped nanoparticles with the size range of 50–70 nm. Surface morphology of the sintered pellet was obtained from high-resolution scanning electron microscopy (HR-SEM). Besides, the effect of irradiation with γ-rays on the quality of resultant NPs has also been studied.

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Section: Solid-state Reactionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

A Study and Comparison of the Preparation of Gadolinium Aluminate Nanoparticles Using γ‐Irradiated and Unirradiated Precursors

Al-Muhimeed

Al‐Kahtani

Mahfouz

et al. 2018

Advances in Materials Science and Engineering

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“…This technique usually requires a uniform mixture of materials or severe grinding and high temperature, which may have a negative impact on the microstructure of the resulting material. At present, it has been reported that GAP was prepared by coprecipitation and sol-gel method, but there is no relevant literature report on the hydrothermal solid-phase method [7][8][9][10]. Because hydrothermal method is to promote the chemical reaction of metal salt in sealed pressure vessel by high temperature and high pressure, the product has the advantages of high purity, complete grain development, uniform composition and simple process.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal-solid state synthesis of Gadolinium aluminate nano whiskers with alkaline mineralizer

Zhong²,

Dai

et al. 2020

Mater. Res. Express

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Gadolinium aluminate (GdAlO 3 , GAP) nano whiskers were synthesized by the hydrothermal-solid state method, Fourier-transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM) and thermogravimetry-differential thermal analysis (TG-DTA) were employed to analyze the phase change and the nucleation mechanism of GAP during calcing process. The results show that the precursor of GAP prepared by hydrothermal is (NH 4 ) x GdAl(OH) y (NO 3 ) z ·nH2O. When the calcination temperature is higher than 900°C, the precursor recrystallizes, forming the needle shape GAP under the synergistic effect factors. The best preparation conditions are as follows: ammonia water as mineralizer, pH=9, calcination temperature 1100°C and holding time 3 h.

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Optoelectronic properties of germanium iodide perovskites AGeI3 (A = K, Rb and Cs): first principles investigations

et al. 2019

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Recent progress in multicolor tuning of rare earth-doped gadolinium aluminate phosphors GdAlO3

Cited by 8 publications

References 101 publications

A Study and Comparison of the Preparation of Gadolinium Aluminate Nanoparticles Using γ‐Irradiated and Unirradiated Precursors

A Study and Comparison of the Preparation of Gadolinium Aluminate Nanoparticles Using γ‐Irradiated and Unirradiated Precursors

Hydrothermal-solid state synthesis of Gadolinium aluminate nano whiskers with alkaline mineralizer

Optoelectronic properties of germanium iodide perovskites AGeI3 (A = K, Rb and Cs): first principles investigations

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