Luminescence Spectra of Erbium Doped Zinc Tellurite Glass Embedded with Gold Nanoparticles

2014 ◽  
Vol 895 ◽  
pp. 231-235
Author(s):  
Md Rahim Sahar ◽  
E. Jaafar ◽  
Sib Krishna Ghoshal
Keyword(s):  
Metallic Nanoparticles ◽  
Tellurite Glass ◽  
Luminescence Spectra ◽  
Excitation Wavelength ◽  
Pl Spectra ◽  
Visible Luminescence ◽  
Erbium Doped ◽  
Doped Glasses ◽  
Gold Nps ◽  
Quenching Method

Understanding the mechanism of visible luminescence enhancement from rare earth doped glasses containing metallic nanoparticles (NPs) is the challenging issue. The photoluminescence (PL) spectra of Er3+: Au-doped tellurite glass is investigated for different concentration of gold NPs. A series of glasses with composition (70-x) TeO2-30 ZnO-0.5 Er2O3x Au where x = (0.1, 0.3, 0.5 mol%) are prepared by melt-quenching method. The thermal parameters such as the glass transition (Tg), crystallization temperature (Tc) and melting temperature (Tm) are determined using DTA thermogram. PL spectra exhibit two distinct peaks at 493nm and 550nm which are assigned to the2H11/2-4I15/2and4S3/2-4I15/2transition respectively. The influence of gold NPs in enhancing the luminescence intensity under the 360nm excitation wavelength is observed understood.

Absorption Features and Luminescence Enhancement of Tellurite Glass Embedded with Metallic Nanoparticles

2016 ◽  
Vol 846 ◽  
pp. 149-153
Author(s):  
M.R. Sahar ◽  
Ezza Syuhada Sazali ◽  
Nurulhuda Mohammad Yusoff
Keyword(s):  
Metallic Nanoparticles ◽  
Tellurite Glass ◽  
Materials Science ◽  
Visible Region ◽  
Emission Spectra ◽  
Large Area ◽  
Color Displays ◽  
Silver Nps ◽  
Doped Glasses ◽  
Quenching Method

This presentation provides a panoramic overview of the recent progress in nanoglass plasmonics, challenges, excitement, applied interests and the future promises. Enhanced optical properties of rare earth (RE) doped glasses for sundry applications are current challenges in materials science and technology. Nanoparticles (NPs) dispersed up-converted (UC) glasses seem to be the ideal candidates in terms of both efficiency and large area coverage provided the absorption cross-section be enhanced. The glasses containing gold NPs (AuNPs) and silver NPs (AgNPs) doped with optimum concentration of RE ions are of particular interest to us. We report the influence of embedded NPs on the luminescence and absorbance characteristics of RE ions doped tellurite glass prepared by melt-quenching method. The absorption and emission spectra displays several prominent peaks corresponding to the transitions from the ground state to the excited states of RE ion. The observed efficient enhancement of up-conversion emissions and absorbance in the entire visible region is attributed to strong localized electric field in vicinity of NPs. Improvements of radiative emissions suggests that the proposed glasses are potential for the development of solid state lasers, color displays and nanophotonic devices.

scholarly journals Spectroscopic Properties of Erbium-Doped Oxyfluoride Phospho-Tellurite Glass and Transparent Glass-Ceramic Containing BaF2 Nanocrystals

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3429 ◽  
Author(s):  
Magdalena Lesniak ◽  
Jacek Zmojda ◽  
Marcin Kochanowicz ◽  
Piotr Miluski ◽  
Agata Baranowska ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Tellurite Glass ◽  
Thermal Structure ◽  
Spectroscopic Properties ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Erbium Doped ◽  
Quenching Method ◽  
Erbium Trifluoride ◽  
Precursor Glass

The ErF3-doped oxyfluoride phospho-tellurite glasses in the (40-x) TeO2-10P2O5-45 (BaF2-ZnF2) -5Na2O-xErF3 system (where x = 0.25, 0.50, 0.75, 1.00, and 1.25 mol%) have been prepared by the conventional melt-quenching method. The effect of erbium trifluoride addition on thermal, structure, and spectroscopic properties of oxyfluoride phospho-tellurite precursor glass was studied by differential scanning calorimetry (DSC), Fourier-transform infrared (FTIR), and Raman spectroscopy as well as emission measurements, respectively. The DSC curves were used to investigate characteristic temperatures and thermal stability of the precursor glass doped with varying content of ErF3. FTIR and Raman spectra were introduced to characterize the evolution of structure and phonon energy of the glasses. It was found that the addition of ErF3 up to 1.25 mol% into the chemical composition of phospho-tellurite precursor glass enhanced 2.7 µm emission and upconversion. By controlled heat-treatment process of the host glass doped with the highest content of erbium trifluoride (1.25 mol%), transparent erbium-doped phospho-tellurite glass-ceramic (GC) was obtained. X-ray diffraction analysis confirmed the presence of BaF2 nanocrystals with the average 16 nm diameter in a glass matrix. Moreover, MIR, NIR, and UC emissions of the glass-ceramic were discussed in detail and compared to the spectroscopic properties of the glass doped with 1.25 mol% of ErF3 (the base glass).

Luminescence Features of Silver Nanoparticles Sensitized Samarium Doped Boro-Zinc Tellurite Glasses

2016 ◽  
Vol 846 ◽  
pp. 96-101
Author(s):  
Sib Krishna Ghoshal ◽  
Masni Shafie@Haron ◽  
M.R. Sahar
Keyword(s):  
Metallic Nanoparticles ◽  
Tellurite Glass ◽  
Emission Cross Section ◽  
Localized Surface Plasmon ◽  
Spectral Features ◽  
Tellurite Glasses ◽  
Ag Nps ◽  
Co Doping ◽  
Quenching Method ◽  
Average Size

Spectral features modification of rare earth (RE) doped tellurite glasses via controlled manipulation of metallic nanoparticles (NPs) is the current challenge in achieving enhanced lasing action. Triggering the localized surface plasmon resonance (SPR) of NPs in the glass generates tremendous applied interests especially in solid state lasers and nanophotonics. Despite several promising features of RE doped zinc-boro-tellurite glass, the low absorption and emission cross-section of RE ions prohibit them from fabricating efficient lasers. This drawback needed to overcome and significant enhancement of spectral features is required. Co-doping by rare earths and/or embedding metallic NPs (acts as sensitizer) are demonstrated to be the alternative route to surmount such shortcomings. Series of glass samples with composition 74TeO2–15B2O3–10ZnO– 1Sm2O3 – (x)Ag, where 0 ≤ x ≤ 0.1 mol% (in excess) are prepared using melt quenching method and the impacts of silver (Ag) NPs concentrations in altering their photoluminescence properties are inspected. The XRD spectra confirmed the amorphous nature of prepared glasses and the presence of Ag NPs are evidenced in EDX spectra. TEM micrographs revealed the distribution of Ag NPs with average size 7.2 nm. Absorption spectra revealed eight bands which most intense between 6F11/2 and 6F1/2. Photoluminescence spectra exhibited three prominent peaks corresponding to the transition from the excited state 4G5/2 to 6H5/2, 6H7/2, and 6H9/2 states, respectively. Our observation may be useful for the development of tellurite glass based nanophotonic devices.

Emission Spectra of Zinc Oxychloride Tellurite Glass: Effects of Eu3+/Sm3+ Co-Doping

2011 ◽  
Vol 181-182 ◽  
pp. 451-454
Author(s):  
M.R. Sahar ◽  
R. Arifin ◽  
S.K. Ghoshal
Keyword(s):  
Tellurite Glass ◽  
Emission Spectra ◽  
Excitation Wavelength ◽  
Co Doping ◽  
Absorption Energy ◽  
Doped Glasses ◽  
Doped Glass ◽  
Co Doped ◽  
Resonance Transfer ◽  
The Eu

Eu3+or/and Sm3+co-doped glasses based on TeO2-ZnO-ZnCl2-Li2O are prepared using the melt quenching technique and the effects of co-doping on the emission spectra of these glasses are examined. The Sm3+doped glass under 403 nm excitations show emission bands around 561, 598 and 642 nm corresponding to the transitions of4G5/2→6H5/2,4G5/2→6H7/2and4G5/2→6H9/2respectively. Whereas, in Eu3+doped glass under 397 nm excitation emission bands appear around 553, 586, 613, 650 and 699 nm that corresponds to the transitions of5D1→7F2,5D0→7F1,5D0→7F2,5D0→7F3and5D0→7F4. In addition, the emission spectra of the Eu3+/Sm3+co-doped glass under 482 nm excitation consists of five bands in which three are contributed by Sm3+at 561, 598 and 642 nm and two by Eu3+at 613 nm and 699 nm respectively. Surprisingly, the emission bands of Eu3+are still observed in the emission spectra of Sm3+for the Eu3+/Sm3+co-doped glasses despite the absence of the excitation wavelength 482 nm in the absorption and excitation domain of Eu3+. This observation is attributed to the partial resonance transfer of the absorption energy from Sm3+to the Eu3+ions.

Optical Properties of Undoped and Dy3+-Doped Boro-Tellurite Glass

2014 ◽  
Vol 895 ◽  
pp. 194-199 ◽  
Author(s):  
Atiqah Ab Rasid ◽  
Husin Wagiran ◽  
Suhairul Hashim ◽  
Rosli Hussin ◽  
Zuhairi Ibrahim
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Tellurite Glass ◽  
Optical Band Gap ◽  
Band Gap Energy ◽  
Excitation Wavelength ◽  
Absorption Bands ◽  
Gap Energy ◽  
Vis Spectroscopy ◽  
Doped Glasses

A series of undoped and Dy3+-doped boro-tellurite glasses were prepared, and their optical properties have been studied through XRD, absorption, optical band gap energy and photoluminescence. The XRD pattern has been used to confirm the amorphous nature of the prepared glass. The optical absorption spectra showed eight absorption bands which corresponded to 4I15/2, 4F9/2, 6F3/2, 6F5/2, 6F7/2, 6F9/2, 6F11/2 and 6H11/2 transitions from the ground state, 6H15/2. The optical band gap energy, Eopt for undoped glass was 3.08 eV and the Dy3+-doped glasses Eopt values varied from 3.16 3.24 eV. The emission spectra from photoluminescence spectroscopy showed two dominant emission peaks at 483 nm and 574 nm with an excitation wavelength of 325 nm (3.82 eV). Keywords: X-ray diffraction, boro-tellurite glass, photoluminescence, absorption spectrum, UV-Vis spectroscopy, energy band gap.

Visible Luminescence Properties of Sm3+ Doped Magnesium Bismuth Phosphate Glasses

2016 ◽  
Vol 675-676 ◽  
pp. 405-408 ◽  
Author(s):  
Narong Sangwaranatee ◽  
Jakrapong Kaewkhao ◽  
Natthakridta Chanthima
Keyword(s):  
Absorption Spectra ◽  
Near Infrared ◽  
Infrared Region ◽  
Phosphate Glasses ◽  
Excitation Wavelength ◽  
Absorption Bands ◽  
Visible Luminescence ◽  
Yellow Color ◽  
Bismuth Phosphate ◽  
Quenching Method

In this research, the magnesium bismuth phosphate glasses doped with different concentration of Sm2O3 have been prepared using the melt quenching method at 1200 °C. Magnesium bismuth phosphate glasses are clear, homogenous and increased yellow color with increasing the concentration of Sm2O3. Physical and optical properties of glass samples were investigated. The results show that, the density and molar volumes were increased with increasing the concentration of Sm2O3. The absorption spectra in the wavelength range at 200 - 2500 nm was observed. It was found that the absorption bands have nine peaks with corresponding to 401, 439, 472, 945, 1081, 1231, 1378, 1480 and 1533 nm. Absorption bands at 401 and 1231 nm are highest absorption spectra in visible and near infrared region, respectively. For the luminescence spectrum of glass samples has shown four emission transitions at 562 (green), 598 (orange), 664 (red) and 705 nm with excitation wavelength at 401 nm. The wavelength at 401 and 598 nm has shown highest intensity of excitation and emission wavelength, respectively.

Improved Self-Cleaning and Spectral Features of Erbium Doped Tellurite Glass with Titania Nanoparticles Sensitization

2017 ◽  
Vol 268 ◽  
pp. 48-53 ◽  
Author(s):  
N.N. Yusof ◽  
Sib Krishna Ghoshal ◽  
Ramli Arifin
Keyword(s):  
Tellurite Glass ◽  
Titania Nanoparticles ◽  
Absorption Bands ◽  
Water Contact ◽  
Display Devices ◽  
Erbium Doped ◽  
Nir Absorption ◽  
Self Cleaning ◽  
Quenching Method ◽  
Average Size

The effects of Titania nanoparticles (TiNPs) sensitization on the self-cleaning, spectral, and physical properties of erbium-doped tellurite glass were determined. Five glass samples with composition (69-x)TeO2-20ZnO-10Na2O-1Er2O3-(x)TiO2, where x = 0.0, 0.1, 0.2, 0.3 and 0.4 mol% were synthesized using melt quenching method. XRD pattern confirmed the amorphous nature of prepared samples and TEM images manifested the growth of nearly spherical TiNPs of average size ≈14 ± 1 nm inside the glass matrix. The observed decrease in the water contact angle from 68o to 43o with increasing TiNPs contents was ascribed to the increase of glass surface hydrophilicity. Meanwhile, enhanced degradation rate of methylene blue (MB) with increasing TiNPs contents up to 0.2 mol% indicated an improved photocatalytic activity of the glass sample. The UV-Vis-NIR absorption spectra exhibited ten significant bands of Er3+ ions. Two plasmon absorption bands were evidenced at 552 and 580 nm. The green band in the photoluminescence spectra of sample containing 0.2 mol% of TiNPs showed highest enhancement factor of 30 times. It is established that the present glass composition is prospective for making self-cleaning surfaces and other display devices.

Luminescence Spectra of TeO2-PbO-Li2O Doped Nd2O3 Glass

2012 ◽  
Vol 501 ◽  
pp. 121-125 ◽  
Author(s):  
K. Azman ◽  
W.A.W. Razali ◽  
H. Azhan ◽  
M.R. Sahar
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Tellurite Glass ◽  
Emission Spectra ◽  
Infrared Emission ◽  
Luminescence Spectra ◽  
Excitation Wavelength ◽  
Wavelength Emission ◽  
Absorption And Emission Spectroscopy ◽  
Near Infrared Emission

A tellurite glass of TeO2-PbO-Li2O doped with Nd2O3 has been successfully fabricated by using the conventional melt-quenched technique. The absorption and emission spectroscopy have been identified using UV-VIS-NIR and photoluminescence spectrometer, respectively. From the spectroscopy, ten significant spectra have been observed in the region of 400-900 nm. The absorption wavelength centered at 585 nm attributed to 4I9/2 → 4G5/2 transition is the predominant wavelength to be used as the excitation wavelength. Emission spectra have been determined by using 585 nm excitation wavelength at room temperature. From the emission spectra, seven distinctive upconversion bands contributed from Nd3+ were observed in the region of 400-1500 nm. It was found that the bands were centered at 450 nm (4G11/2 → 4I9/2), 485 nm (4G11/2 → 4I11/2), 605 nm (4G11/2 → 4I15/2), 665 nm (4G7/2 → 4I13/2), 880 nm (4F3/2 → 4I9/2), 1062 nm (4F3/2 → 4I11/2) and 1340 nm (4F3/2 → 4I11/2), respectively. Tthese emission bands showed the possibility of visible and near infrared emission spectra.

Optical Properties of Oxy-Chloride Tellurite Glass: Role of Samarium Ions

2015 ◽  
Vol 1107 ◽  
pp. 437-442
Author(s):  
Sib Krishna Ghoshal ◽  
Nurul Syuhada Mohamad Zake ◽  
Ramli Arifin ◽  
Md Rahim Sahar ◽  
Md Supar Rohani ◽  
...  
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Metallic Nanoparticles ◽  
Tellurite Glass ◽  
Experimental Studies ◽  
Rare Earth Ions ◽  
Ion Concentrations ◽  
Co Doping ◽  
Quenching Method ◽  
Alternative Routes

. Achieving tunable optical properties of inorganic glasses via optimized doping of rare earth ions is ever-demanding in photonics. Control and inhibition of luminescence quenching, nonradiative decay and multi-phonon relaxation responsible of reduction of optical performance remains challenging. Doping/co-doping of different rare earth ions, variation of modifiers and embedding metallic nanoparticles (NPs) are thought as alternative routes to enhance optical response are still underway. We examine the influence of samarium ion concentrations on the optical properties of oxy-chlorite tellurite glasses of the form (70-x)TeO2-15MgO-5Li2O-10LiCl-xSm2O3 with 0.0 x 2.5 mol% prepared using melt-quenching method. The structural and optical characterizations are performed via X-ray diffraction (XRD), Ultraviolet-Visible (UV-Vis) absorption and photoluminescence (PL) spectroscopy. The glass density increased from 4.509 - 4.770 with the increase of Sm2O3 contents from 0.0 2.5 mol %. The XRD spectra confirm the amorphous nature of the glass. The absorption spectra exhibit nine prominent peaks corresponding to the transitions from the ground to excited states and the PL spectra reveal four peaks. The optical energy band gap for direct and indirect transitions are increased and Urbach energy decreased from 3.448 - 3.497, 3.165 - 3.232 and 0.217 - 0.175, respectively with the increase of Sm3+ ion concentrations. Furthermore, the significant enhancement in UV-Vis and PL response display the strong influence of samarium ion on optical and structural properties. The mechanism responsible for enhanced optical properties are analyzed and discussed. The results suggest that our careful experimental studies may contribute towards the development of tellurite glass based solid state lasers.

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