scholarly journals Strong emission at 1000 nm from Pr3+/Yb3+-codoped multicomponent tellurite glass

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Bozena Burtan-Gwizdala ◽  
Manuela Reben ◽  
Jan Cisowski ◽  
El Sayed Yousef ◽  
Radoslaw Lisiecki ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Near Infrared ◽  
Tellurite Glass ◽  
Emission Spectra ◽  
Optimal Choice ◽  
Radiative Energy ◽  
Absorption Data ◽  
Strong Emission ◽  
Doped Glasses

Abstract We have investigated the spectroscopic properties of Pr3+-doped and Pr3+/Yb3+-codoped tellurite glass with the molar composition 78TeO2–10Nb2O5–5PbO–1PbF2–5Li2O–1La2O3. Analysis of the absorption data has allowed us to calculate the radiative lifetimes of 3P0 excited state of Pr3+ ions and 2F5/2 excited state of Yb3+ ions as being equal to 9.43 and 440 µs, respectively. These values appear to be much higher than those obtained from the lifetime measurements indicating the presence of various energy transfer mechanisms. This conclusion is supported by analysis of the emission spectra obtained for doped glasses under the 445 nm excitation; the visible spectra consist of only Pr3+ transitions, while the near infrared spectrum of Pr3+/Yb3+-codoped glass demonstrates a strong emission from the 2F5/2 excited state of Yb3+ ion around 1000 nm. This emission is a result of the Pr3+–Yb3+ down-conversion energy transfer and its efficiency for our Pr3+/Yb3+-codoped glass is estimated as 29%. For potential applications, it is important to increase this efficiency and further studies are desirable, in particular, an optimal choice of Pr3+ and Yb3+ concentrations to minimize non-radiative energy transfers among the ions through cross-relaxation and energy migration processes.

scholarly journals Upconversion Luminescence of Silica–Calcia Nanoparticles Co-doped with Tm3+ and Yb3+ Ions

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 937
Author(s):  
Katarzyna Halubek-Gluchowska ◽  
Damian Szymański ◽  
Thi Ngoc Lam Tran ◽  
Maurizio Ferrari ◽  
Anna Lukowiak
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Upconversion Luminescence ◽  
Sol Gel ◽  
Emission Spectra ◽  
Transmission Electron ◽  
Characteristic Emission ◽  
Diffraction Patterns ◽  
Size Of Particles ◽  
Average Size

Looking for upconverting biocompatible nanoparticles, we have prepared by the sol–gel method, silica–calcia glass nanopowders doped with different concentration of Tm3+ and Yb3+ ions (Tm3+ from 0.15 mol% up to 0.5 mol% and Yb3+ from 1 mol% up to 4 mol%) and characterized their structure, morphology, and optical properties. X-ray diffraction patterns indicated an amorphous phase of the silica-based glass with partial crystallization of samples with a higher content of lanthanides ions. Transmission electron microscopy images showed that the average size of particles decreased with increasing lanthanides content. The upconversion (UC) emission spectra and fluorescence lifetimes were registered under near infrared excitation (980 nm) at room temperature to study the energy transfer between Yb3+ and Tm3+ at various active ions concentrations. Characteristic emission bands of Tm3+ ions in the range of 350 nm to 850 nm were observed. To understand the mechanism of Yb3+–Tm3+ UC energy transfer in the SiO2–CaO powders, the kinetics of luminescence decays were studied.

Synthesis and properties of diads based on tetra-aryl porphyrins and ruthenium bis-terpyridine-type complexes

2001 ◽  
Vol 05 (07) ◽  
pp. 600-607 ◽  
Author(s):  
ISABELLE M. DIXON ◽  
JEAN-PAUL COLLIN
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Fluorescence Quenching ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Free Base ◽  
Strong Electron ◽  
Transfer Processes ◽  
C Complex

Four diads consisting of a free-base or zinc aryl-porphyrin associated with two ruthenium(II) bis(terdentate) complexes (non-cyclometallated Ru ( N 6) or cylometallated Ru ( N 5 C )) have been synthesized. The strong electron-withdrawing properties of the Ru ( N 6) as compared to the Ru ( N 5 C ) complex have been illustrated by their electrochemical and spectroscopic properties. Emission spectra of the diads and the reference compounds have shown that very efficient fluorescence quenching occurs, probably by energy transfer processes from the porphyrin to the 3MLCT excited state of the ruthenium unit.

Emission spectra of Cs2KTbCl6and Cs2KEuCl6, and Tb3+→Eu3+non-radiative energy transfer in Cs2KTb0.9Eu0.1Cl6

2001 ◽  
Vol 28 (3-4) ◽  
pp. 103-113 ◽  
Author(s):  
M. E. VILLAFUERTE-CASTREJON ◽  
M. E. ALVAREZ R ◽  
U. CALDINTO G. ◽  
JULIO GONZOLO
Keyword(s):  
Energy Transfer ◽  
Emission Spectra ◽  
Radiative Energy ◽  
Radiative Energy Transfer

Tunable near-infrared emission of binary nano- and mesoscale GUMBOS

RSC Advances ◽  
2014 ◽  
Vol 4 (54) ◽  
pp. 28471-28480 ◽  
Author(s):  
Atiya N. Jordan ◽  
Noureen Siraj ◽  
Susmita Das ◽  
Isiah M. Warner
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Emission Spectra ◽  
Infrared Emission ◽  
Förster Resonance Energy Transfer ◽  
Near Infrared Emission ◽  
Tunable Emission ◽  
Förster Resonance

Mixtures of GUMBOS were used to form binary nanomaterials with tunable emission spectra due to Förster resonance energy transfer (FRET).

Optical Absorption of Er3+/Nd3+ Codoped Lithium Niobate Tellurite Glass

2015 ◽  
Vol 1107 ◽  
pp. 415-419
Author(s):  
Nurhafizah Hasim ◽  
Md Supar Rohani ◽  
Md Rahim Sahar ◽  
Sib Krishna Ghoshal
Keyword(s):  
Excited State ◽  
Lithium Niobate ◽  
Near Infrared ◽  
Tellurite Glass ◽  
Urbach Energy ◽  
Nir Spectroscopy ◽  
Band Gaps ◽  
Content Increase ◽  
Phonon Interaction ◽  
Nir Absorption

Keywords: Tellurite Glass, UV-Vis-NIR, absorption, Urbach energy. Abstract: To improve the optical behaviour of Lithium Niobate Tellurite glass with rare- earth dopant are the important issue from application and device perspectives. Er3+ and Nd3+ doped tellurite glasses of molar composition (70-x-y)TeO2 – 15Li2CO3 – 15Nb2O5 – xEr2O3 – yNd2O3 system (x = 0 mol % and 1.0 mol %) (0 mol % ≤ y ≤ 1.0 mol %) have successfully been made by using melt quenching technique. The physical properties of the glass sample are obtained. From Ultraviolet- Visible- Near Infrared (UV-Vis-NIR) Spectroscopy, it is observed that the spectrum consists absorption peaks which corresponded to transitions from both ground state of Erbium, 4I15/2 to the excited state of 4I15/2, 4I13/2, 4I3/2, 4I11/2, 2H9/2, 4I9/2, 2H11/2, 4S3/2, 2H11/2 and 4F7/2 respectively and Neodymium, 4I9/2 to the excited state of 4I15/2, 4I15/2, 4I3/2, 4F9/2, 2G7/2, 2G9/2 and 2G11/2 respectively. The indirect band gaps obtained from the above dependence are the interband transitions, but later it involves the phonon interaction where the values of indirect optical band gaps lie between 2.84 eV to 3.12 eV as the Nd2O3 content increase. The Urbach energy for the glass system decreases from 0.31 eV to 0.21 eV as the Nd2O3 content increase.

Downconversion for Solar Cells in Sr3Gd(PO4)3:Tb, Yb Phosphors

2012 ◽  
Vol 502 ◽  
pp. 136-139 ◽  
Author(s):  
Jia Yue Sun ◽  
Yi Ning Sun ◽  
Ji Cheng Zhu ◽  
Jun Hui Zeng ◽  
Hai Yan Du
Keyword(s):  
Energy Transfer ◽  
Solar Cell ◽  
Near Infrared ◽  
Emission Spectra ◽  
Fluorescence Decay ◽  
Quantum Cutting ◽  
Silicon Based ◽  
Visible Photon ◽  
Co Doped ◽  
Cooperative Energy

An efficient near-infrared (NIR) quantum cutting (QC) Tb3+ and Yb3+ co-doped phosphor Sr3Gd(PO4)3 has been synthesized by conventional high temperature solid technique. Upon excitation of Tb3+ with a visible photon at 485 nm, two NIR photons could be emitted by Yb3+ through cooperative energy transfer (CTE) from Tb3+ to two Yb3+ ions. Excitation and emission spectra as well as fluorescence decay measurements have been carried out to examine the occurrence of cooperative energy transfer (CET ) from Tb3+ to Yb3+ ions. The result indicates Tb3+ and Yb3+ co-doped Sr3Gd(PO4)3 is potentially used as down-converter layer in silicon-based solar cell.

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 Efficient near-infrared quantum cutting by cooperative energy transfer in Bi3TeBO9:Nd3+ phosphors

2022 ◽  
Author(s):  
T. Zhezhera ◽  
P. Gluchowski ◽  
M. Nowicki ◽  
M. Chrunik ◽  
A. Majchrowski ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Spectral Range ◽  
Near Infrared ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Infrared Emission ◽  
Fluorescence Decay ◽  
Visible Spectral Range ◽  
Visible Radiation ◽  
Quantum Cutting

Abstract An efficient near-infrared quantum cutting process by cooperative down-conversion of active Bi3+ and Nd3+ ions was demonstrated in Bi3TeBO9:Nd3+ phosphors. In particular, the near-infrared emission of Nd3+ ions enhanced by Bi3+ ions of a series of novel Bi3TeBO9:Nd3+ microcrystalline powders doped with Nd3+ ions in various concentrations was investigated. In order to investigate the luminescent properties of BTBO:Nd3+ powders, the excitation and emission spectra and the fluorescence decay time were measured and analyzed. In particular, the emission of Bi3TeBO9:Nd3+ at 890 and 1064 nm was excited at 327 nm (via energy transfer from Bi3+ ions) and at 586.4 nm (directly by Nd3+ ions). The highest intensity emission bands in near-infrared were detected in the spectra of Bi3TeBO9:Nd3+ doped with 5.0 and 0.5 at.% of Nd3+ ions upon excitation in ultraviolet and visible spectral range, respectively. The fluorescence decay lifetime monitored at 1064 nm for Bi3TeBO9:Nd3+ powders shows the single- or double-exponential character depending on the concentrations of Nd3+ ions. The possible mechanisms of energy relaxation after excitation Bi3TeBO9:Nd3+ powders in ultraviolet or visible spectral range were discussed. The investigated Bi3TeBO9:Nd3+ phosphors efficiently concentrate the ultraviolet/visible radiation in the near-infrared spectral range and can be potentially used as effective spectral converters. Graphical abstract

Sign in / Sign up

Export Citation Format

Share Document