Effect of heat treatment on structural, thermal and optical properties of Eu3+ doped tellurite glass: Formation of glass-ceramic and ceramics

Dwivedi, Abhishek; Joshi, C.; Rai, Sanjay

doi:10.1016/j.optmat.2015.03.038

Cited by 40 publications

(9 citation statements)

References 33 publications

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“…The optical band gap (E g ) of the phosphor samples has been calculated using the Wood and Tauc plot as discussed in our earlier research [14,21]. The obtained values of 'E g ' in YBOTmYb, GBOTmYb and LBOTmYb are 3.78, 4.50 and 3.27 eV, respectively, as shown in figures 3(d)-(f) by extrapolation of the linear portion at α = 0.…”

Section: Structural and Morphological Analysismentioning

confidence: 83%

Tm³⁺, Yb³⁺activated ANbO₄(A = Y, Gd, La) phosphors: a comparative study of optical properties (downshifting and upconversion emission) and laser induced heating effect

Dwivedi¹,

Mishra²,

B³

2016

J. Phys. D: Appl. Phys.

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A comparative study of optical properties and laser induced heating effects in Tm 3+ , Yb 3+ doped YNbO 4 , GdNbO 4 and LaNbO 4 phosphors is presented in this work. The phosphors were structurally characterized by x-ray diffraction and scanning electron microscopy measurements. The vibrational structures of the phosphors were studied using FTIR measurements. The optical band gaps (E g), calculated from the Wood and Tauc plot, are found to be 3.78, 4.50 and 3.27 eV for YNbO 4 , GdNbO 4 and LaNbO 4 , respectively. The luminescence property (downshifting (DS) and upconversion (UC)) was studied in the powder and the pellet forms of the phosphor samples. The DS emission of Tm 3+ doped ANbO 4 phosphors (λ ex = 265 nm) consists of broad blue emission due to (NbO 4) 3− group overlapped with sharp peaks due to f-f transition of Tm 3+ ion with most prominent emission one in the case of YNbO 4 phosphor. The DS emission is comparatively more intense in the pellet form. The NIR excited UC emission spectra of Tm 3+ , Yb 3+ co-doped ANbO 4 phosphors contain intense blue and NIR emissions due to the Tm 3+ ion. Contrary to the DS study, the best UC result is found for LaNbO 4 phosphor in pellet form. Further, the laser induced heating effect in UC emission with respect to laser pump power and irradiation time has also been studied in Tm 3+ , and Yb 3+ co-doped ANbO 4 phosphors. It was found to be more effective in the case of the YNbO 4 host where the heating effect is more prominent in the powder sample. We discuss the mechanisms involved in these observations in detail.

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Section: Structural and Morphological Analysismentioning

confidence: 83%

Tm³⁺, Yb³⁺activated ANbO₄(A = Y, Gd, La) phosphors: a comparative study of optical properties (downshifting and upconversion emission) and laser induced heating effect

Dwivedi¹,

Mishra²,

B³

2016

J. Phys. D: Appl. Phys.

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“…From the absorption curve, it clearly can be seen that the intensive absorption occurs in the range of 250-390 nm. In this study, the fundamental absorption edge of the samples is assumed to be the direct transition [29]. From the plot of ( ℎV) 2 against ℎV, the value of optical band gap energy, , is obtained by extrapolating the linear fitted regions to ( ℎV) 2 = 0.…”

Section: Resultsmentioning

confidence: 99%

Investigation on Structural and Optical Properties of Willemite Doped Mn²⁺Based Glass-Ceramics Prepared by Conventional Solid-State Method

Samsudin

Матори

Liew

et al. 2015

Journal of Spectroscopy

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Mn-doped willemite (Zn 2 SiO 4 :Mn 2+ ) glass-ceramics derived from ZnO-SLS glass system were prepared by a conventional meltquenching technique followed by a controlled crystallization step employing the heat treatment process. Soda lime silica (SLS) glass waste, ZnO, and MnO were used as sources of silicon, zinc, and manganese, respectively. The obtained glass-ceramic samples were characterized using the X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared (FTIR), UV-Visible (UV-Vis), and photoluminescence (PL) spectroscopy. The results of XRD revealed that ZnO crystal and willemite ( -Zn 2 SiO 4 ) were presented as major embedded crystalline phases. This observation was consistent with the result of FESEM which showed the presence of irregularity in shape and size of willemite crystallites. FTIR spectroscopy exhibits the structural evolution of willemite based glass-ceramics. The optical band gap shows a decreasing trend as the Mn-doping content increased. Photoluminescent technique was applied to characterize the role of Mn 2+ ions when entering the willemite glass-ceramic structure. By measuring the excitation and emission spectra, the main emission peak of the glass-ceramic samples located at a wavelength of 585 nm after subjecting to 260 nm excitations. The following results indicate that the obtained glass-ceramics can be applied as phosphor materials.

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“…In general, a glass with ∆T greater than 100 • C can be used as a feedstock for the production of optical fibers [20,25]. As can be seen from Table 1 the addition of Ag increased the stability in about 70 • C. Such effect is significantly higher than the observed in other similar glasses [23].…”

Section: Thermal Analysismentioning

confidence: 86%

On the prospects of enhance glass based devices with silver nanoparticles: The case of Pr3+ doped tellurite-tungstate glasses

Taniguchi

Marconi

Herculano

et al. 2018

Journal of Alloys and Compounds

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Effect of heat treatment on structural, thermal and optical properties of Eu3+ doped tellurite glass: Formation of glass-ceramic and ceramics

Cited by 40 publications

References 33 publications

Tm³⁺, Yb³⁺activated ANbO₄(A = Y, Gd, La) phosphors: a comparative study of optical properties (downshifting and upconversion emission) and laser induced heating effect

Tm³⁺, Yb³⁺activated ANbO₄(A = Y, Gd, La) phosphors: a comparative study of optical properties (downshifting and upconversion emission) and laser induced heating effect

Investigation on Structural and Optical Properties of Willemite Doped Mn²⁺Based Glass-Ceramics Prepared by Conventional Solid-State Method

On the prospects of enhance glass based devices with silver nanoparticles: The case of Pr3+ doped tellurite-tungstate glasses

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Effect of heat treatment on structural, thermal and optical properties of Eu3+ doped tellurite glass: Formation of glass-ceramic and ceramics

Cited by 40 publications

References 33 publications

Tm3+, Yb3+activated ANbO4(A = Y, Gd, La) phosphors: a comparative study of optical properties (downshifting and upconversion emission) and laser induced heating effect

Tm3+, Yb3+activated ANbO4(A = Y, Gd, La) phosphors: a comparative study of optical properties (downshifting and upconversion emission) and laser induced heating effect

Investigation on Structural and Optical Properties of Willemite Doped Mn2+Based Glass-Ceramics Prepared by Conventional Solid-State Method

On the prospects of enhance glass based devices with silver nanoparticles: The case of Pr3+ doped tellurite-tungstate glasses

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Tm³⁺, Yb³⁺activated ANbO₄(A = Y, Gd, La) phosphors: a comparative study of optical properties (downshifting and upconversion emission) and laser induced heating effect

Tm³⁺, Yb³⁺activated ANbO₄(A = Y, Gd, La) phosphors: a comparative study of optical properties (downshifting and upconversion emission) and laser induced heating effect

Investigation on Structural and Optical Properties of Willemite Doped Mn²⁺Based Glass-Ceramics Prepared by Conventional Solid-State Method