The role of fluorine in high quantum yield oxyfluoride glasses and glass-ceramics

Meyneng, Thomas; Thomas, Jyothis; Ledemi, Yannick; Allix, Mathieu; Véron, Emmanuel; Genevois, Cécile; Kashyap, Raman; Messaddeq, Younès

doi:10.1016/j.jallcom.2021.163512

Cited by 9 publications

(6 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, concentration quenching was evident in the quantum yield as well as lifetime measurements in the case of MCVD SiO 2 glass. The quantum yield of all glasses obtained through integrating sphere method 22 , 23 , 28 while exciting with 1029 nm laser are provided in Table 1 . A maximum quantum yield of ~ 99.4% was achieved for GAYY-3 glass.…”

Section: Resultsmentioning

confidence: 99%

“…Also is the resonant absorption coefficient and is the background absorption coefficient. The quantum efficiency can be approximated as 28 , 53 – 55 where and are radiative and quenching rate respectively. N is the density of ions and N c is the critical density of ions due to the quenching.…”

Section: Resultsmentioning

confidence: 99%

“…( 2) can be expanded as follows www.nature.com/scientificreports/ where the absorption efficiency can be expressed as Also α r is the resonant absorption coefficient and α b is the background absorption coefficient. The quantum efficiency can be approximated as 28,[53][54][55] where γ rad and γ q are radiative and quenching rate respectively. N is the density of ions and N c is the critical density of ions due to the quenching.…”

Section: Theoretical Model and Numerical Resultsmentioning

confidence: 99%

“…To counter these limitations, our previous work concentrated on artificially creating a low phonon environment for the rare earth in high phonon energy oxide glasses, by the use of fluoride nanocrystals [20][21][22][23][24][25][26][27][28] . While this technique showed enhanced quantum efficiency of emission and increased lifetimes, the fabrication route was limited by the purity of starting materials and the process by which the glasses were made 29 , requiring a radical change in the glass making process.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Demonstration of laser cooling in a novel all oxide GAYY silica glass

Thomas

Meyneng

Tehranchi

et al. 2023

Sci Rep

Self Cite

View full text Add to dashboard Cite

We demonstrate laser induced cooling in ytterbium doped silica (SiO2) glass with alumina, yttria co-doping (GAYY-Aluminum: Yttrium: Ytterbium Glass) fabricated using the modified chemical vapour deposition (MCVD) technique. A maximum temperature reduction by − 0.9 K from room temperature (296 K) at atmospheric pressure was achieved using only 6.5 W of 1029 nm laser radiation. The developed fabrication process allows us to incorporate ytterbium at concentration of 4 × 1026 ions/m3 which is the highest value reported for laser cooling without clustering or lifetime shortening, as well as to reach a very low background absorptive loss of 10 dB/km. The numerical simulation of temperature change versus pump power well agrees with the observation and predicts, for the same conditions, a temperature reduction of 4 K from room temperature in a vacuum. This novel silica glass has a high potential for a vast number of applications in laser cooling such as radiation-balanced amplifiers and high-power lasers including fiber lasers.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Theoretical Model and Numerical Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Demonstration of laser cooling in a novel all oxide GAYY silica glass

Thomas

Meyneng

Tehranchi

et al. 2023

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…al. [ 22 ]. The effect of germanium concentration on visible emission of Er 3+ in tellurite glasses was studied by O.B.…”

Section: Introductionmentioning

confidence: 99%

Examining the Spectroscopic and Thermographic Qualities of Er3+-doped Oxyfluoride Germanotellurite Glasses

2022

View full text Add to dashboard Cite

Novel ternary fluoro-germano-tellurite (GTS) glasses doped with Er3+ ions with 0.5 mol% and 1.0 mol% were fabricated by a conventional melt and quenching method and investigated using methods of optical spectroscopy. The room-temperature absorption spectrum was recorded and analyzed to determine radiative transition rates, radiative lifetimes, and branching ratios of Er3+ luminescence. Decay curves of Er3+ luminesccence were recorded and analyzed. Temperature dependences of emission spectra and absorption spectra in the region from RT (room-temperature) up to 675 K were studied in detail. The contribution of competing radiative and nonradiative processes to the relaxation of luminescent levels of Er3+ was assessed. Absolute and relative sensitivity were established utilizing the comprehensive model based on thermally coupled 2H11/2/4S3/2 excited states of erbium. The high quantum efficiency of the first erbium-excited state and value of gain coefficient indicate that GTS:Er glass system can be considered as conceivable NIR (near infrared) laser material as well.

show abstract

Blue‐Emitting 2‐Fluoroaryl‐1,2,3‐Triazole Fluorophores: Synthesis, Theoretical Calculations, and Optical Properties

et al. 2023

View full text Add to dashboard Cite

A convenient multistep synthetic methodology to afford prospective push‐pull fluorophores based on the N(2)‐fluoroaryl‐1,2,3‐triazole scaffold as valuable functional blocks in the design of blue‐emitting organic materials is reported. The strategy includes five synthetic steps with yields of 60–99% at each stage. The obtained photoactive molecules, 2‐fluoroaryl‐5‐aryl‐4‐methyl‐1,2,3‐triazoles, were found to possess a blue‐violet emission in the range of λ=330–440 nm and the absolute quantum yield of >99% in solvents of different polarities. The electron transfer mechanistic features in the excited states for the developed N(2)‐fluoroaryl‐1,2,3‐triazoles compared to the 1,2,3‐triazoles‐1‐oxide analogues were also studied by using DFT and CIS calculations.

show abstract

The role of fluorine in high quantum yield oxyfluoride glasses and glass-ceramics

Cited by 9 publications

References 35 publications

Demonstration of laser cooling in a novel all oxide GAYY silica glass

Demonstration of laser cooling in a novel all oxide GAYY silica glass

Examining the Spectroscopic and Thermographic Qualities of Er3+-doped Oxyfluoride Germanotellurite Glasses

Blue‐Emitting 2‐Fluoroaryl‐1,2,3‐Triazole Fluorophores: Synthesis, Theoretical Calculations, and Optical Properties

Contact Info

Product

Resources

About