Enhanced Photoluminescence at λ = 1.54 μm in the Cu-Doped Er:SiO 2 System

2018

ChemPhysChem

This paper reports on the effects of temperature on light absorption and emission in Cu + and Dy 3 + co-doped phosphate glass, which is of interest for photonic applications. First, the temperature dependence of the absorption edge of the glass in connection with Cu + ions absorption was assessed. A thermally-induced red shift attributed to Cu + ion-lattice interactions was observed and analyzed through optical band gap determinations in the context of indirect-allowed transitions. Application of the Varshni model for the dependence of the energy gaps with temperature allowed to estimate the 0 K energy gap at 2.87 (� 0.01) eV. Furthermore, Dy 3 + photoluminescence (PL) along with Cu nanoparticles (NPs) absorption was monitored in real-time during an isothermal treatment by the in situ concurrent PL and absorption microspectroscopy technique. Periods of enhancement and quenching of Dy 3 + emission linked to bidirectional energy transfer processes involving nonplasmonic Cu clusters and plasmonic Cu NPs were revealed. The formation of Cu NPs was promoted by tin(II) used as reductant. It is the first time to the author's knowledge that the 0 K energy gap is estimated for a highly Cu + -doped glass and that the enhancement of Dy 3 + PL by Cu clusters is exposed.[a] Dr.

“…Eventually, the appearance of the plasmonic Cu NPs lead to the Eu 3+ PL quenching effect . Reports by Cattaruzza et al . and Trave et al .…”

Section: Resultsmentioning

confidence: 92%

Temperature Dependent Spectroscopic Properties of Cu⁺ and Dy³⁺ Co‐Doped Phosphate Glass: Band Gap Analysis and Cu Nanocluster‐Enhanced Dy³⁺ Luminescence

2018

ChemPhysChem

“…Copper nanoclusters have generated considerable interest in various fields of research such as catalysis, surface-enhanced Raman scattering, nonlinear materials in optical media, and photonic applications as luminescent sensitizers . With respect to the latter, the presence of nonplasmonic clusters (nPCs) of the noble metal is realized in a robust transparent inorganic material together with a rare-earth (RE) metal of practical interest for optical applications such as Er 3+ . However, material preparation presents a challenge given that copper can acquire various oxidation states (Cu 2+ , Cu + , Cu 0 ), where the predominant stability is for the Cu 2+ ion especially for syntheses carried out under ambient atmosphere. , Hence, studies concerning the influence of Cu nPCs on other RE ions of interest coembedded in a durable dielectric matrix such as glass are currently lacking in the literature.…”

Section: Introductionmentioning

confidence: 99%

Carbon-Promoted in Situ Evolution of Cu Nanoclusters Influencing Eu³⁺ Photoluminescence in Glass: Bidirectional Energy Transfer

2016

J. Phys. Chem. C

The present work explores the use of carbon powder, recently proposed for producing plasmonic metal nanocomposites, as a means to obtain Eu3+ photoluminescence (PL) enhancements via Cu nanoclusters in glass. Phosphate glasses containing Eu2O3 and CuO were prepared by melting in ambient atmosphere with graphite powder added to the batch materials for the chemical reduction of copper(II). Optical absorption and PL spectroscopy characterizations, including emission decay dynamics, were performed. The data show consistently the effective reduction of Cu2+ ions via carbon during melting which ultimately leads to thermally induced copper particle precipitation. Further, the novel in situ concurrent PL and absorption microspectroscopy technique was employed for the real-time monitoring of the optical properties of the codoped glasses during thermal processing from 470 to 490 °C. Bidirectional energy transfer between europium ions and copper nanoclusters has been manifested through enhancement and quenching regimes of Eu3+ PL. These periods were observed well separated in time, favorable for the optical tuning of the solid-state luminescent material. Relating simultaneously the luminescence with the time evolution in optical absorption allowed for discriminating the effects of Cu preplasmonic clusters as energy donors and Cu nanoparticles as acceptors, to and from Eu3+ ions, respectively.

“…4 I 15/2 ) Er 3þ emission, for instance, by co-doping with another rare-earth, 3,8 semiconductor nanoparticles, 5 and noble metals in different oxidation and aggregation states. 1,2, 4,6,7 With respect to the noble metals, reports on the influence of copper species on Er-containing dielectrics are scarce. Cataruza et al 6 and Trave et al 10 have investigated on the sensitizing effects of copper aggregates on the near-IR Er 3þ emission in sputtered glass silica films.…”

Section: Introductionmentioning

confidence: 99%

“…1,2, 4,6,7 With respect to the noble metals, reports on the influence of copper species on Er-containing dielectrics are scarce. Cataruza et al 6 and Trave et al 10 have investigated on the sensitizing effects of copper aggregates on the near-IR Er 3þ emission in sputtered glass silica films. However, the effects of various copper species such as the single Cu þ ions on Er 3þ ions in phosphate-based glasses remains unexplored.…”

Section: Introductionmentioning

confidence: 99%

Enhanced 1.53 μm emission of Er3+ ions in phosphate glass via energy transfer from Cu+ ions

Journal of Applied Physics

Sendova

2014

Enhanced effect of Ce3+ ions on 2 μm emission and energy transfer properties in Yb3+/Ho3+ doped fluorophosphate glasses J. Appl. Phys. 109, 083535 (2011); 10.1063/1.3569855 Demonstration of enhanced population feeding of the 1.53 μ m emitting level of Er 3 + in Te O 2 -W O 3 -Li 2 O -P 2 O 5 glasses using upconversion luminescence spectroscopy J. Appl. Phys. 103, 063107 (2008); 10.1063/1.2891788 2.8 and 1.55 μ m emission from diode-pumped Er 3 + -doped and Yb 3 + co-doped lead lanthanum zirconate titanate transparent ferroelectric ceramicOptimizing the efficiency of Er 3þ emission in the near-infrared telecommunication window in glass matrices is currently a subject of great interest in photonics research. In this work, Cu þ ions are shown to be successfully stabilized at a high concentration in Er-containing phosphate glass by a single-step melt-quench method, and demonstrated to transfer energy to Er 3þ thereby enhancing the near-infrared emission about 15 times. The spectroscopic data indicate an energy conversion process where Cu þ ions first absorb photons broadly around 360 nm and subsequently transfer energy from the Stokes-shifted emitting states to resonant Er 3þ absorption transitions in the visible. Consequently, the Er 3þ electronic excited states decay and the 4 I 3/2 metastable state is populated, leading to the enhanced emission at 1.53 lm. Monovalent copper ions are thus recognized as sensitizers of Er 3þ ions, suggesting the potential of Cu þ co-doping for applications in the telecommunications, solar cells, and solid-state lasing realizable under broad band near-ultraviolet optical pumping. V C 2014 AIP Publishing LLC. [http://dx.[This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 136.165.238.131 On: Mon, 22 Dec 2014 17:48:53 033518-3 J. A. Jim enez and M. Sendova J. Appl. Phys. 116, 033518 (2014) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 136.165.238.131 On: Mon, 22 Dec 2014 17:48:53 033518-4 J. A. Jim enez and M. Sendova J. Appl. Phys. 116, 033518 (2014) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 136.165.238.131 On: Mon, 22 Dec 2014 17:48:53 033518-5 J. A. Jim enez and M. Sendova J. Appl. Phys. 116, 033518 (2014) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 136.165.238.131 On: Mon, 22 Dec 2014 17:48:53 033518-6 J. A. Jim enez and M. Sendova J. Appl. Phys. 116, 033518 (2014) [This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to ] IP: 136.165.238.131 On: Mon, 22 Dec 2014 17:48:53