Effect of heat treatment mechanism on upconversion luminescence in Er 3+ /Yb 3+ co-doped NaYF 4 oxyfluoride glass-ceramics

Gao, Yuan; Hu, Yuebo; Zhou, Dacheng; Qiu, Jianbei

doi:10.1016/j.jallcom.2016.12.437

Cited by 31 publications

(7 citation statements)

References 11 publications

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“… 15 NaYF 4 nanocrystals were also found to precipitate in glasses within the glass system SiO 2 –Al 2 O 3 –Na 2 O–NaF–YF 3 –ErF 3 –YbF 3 after heat-treatment. 16,17 However, it was found recently, that the crystal growth of NaYF 4 in this glass system is limited by the duration of the heat treatment. Crystal size was reported to be between 9 and 12 nm when heat treating the glass at 560 °C.…”

Section: Introductionmentioning

confidence: 96%

“…16,17 However, it was found recently, that the crystal growth of NaYF 4 in this glass system is limited by the duration of the heat treatment. Crystal size was reported to be between 9 and 12 nm when heat treating the glass at 560 C. 18 It is known that the structure of the glass has a signicant impact on the crystallization species, crystal size, crystal shapes and the distance among the particles.…”

Section: Introductionmentioning

confidence: 96%

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Upconversion from fluorophosphate glasses prepared with NaYF₄:Er³⁺,Yb³⁺ nanocrystals

et al. 2018

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The direct doping method was applied to fabricate upconverter fluorophosphate glasses in the system (90NaPO 3 -(10-x)Na 2 O-xNaF) (mol%) by adding ,Yb 3+ nanocrystals-containing glasses was observed using a 980 nm pumping, the intensity of which depends on the glass composition and on the direct doping parameters (T doping and dwell time). The strongest upconversion was obtained from the glass with x ¼ 10 prepared using a T doping of 550 C and a 3 min dwell time. Finally, we showed that the upconversion, the emission at 1.5 mm and of the transmittance spectra of the nanocrystals-containing glasses could be measured to verify if decomposition of the nanocrystals occurred in glass melts during the preparation of the glasses.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 96%

Upconversion from fluorophosphate glasses prepared with NaYF₄:Er³⁺,Yb³⁺ nanocrystals

et al. 2018

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“…Most semiconductor chip-based NIR pc-LEDs emit the NIR-I region, and their emission peaks are generally very narrow. The broadband NIR phosphor-based NIR pc-LED devices with ultraviolet/blue LED chips as the excitation light source emerge as the mainstream NIR devices due to their low cost, high luminous efficiency, and good spectrum turnability. − Rare earth ions (Pr 3+ , Nd 3+ , Ho 3+ , Er 3+ , and Tm 3+ ) and transition metal ions (Mn 5+ , Mn 6+ , Ni 2+ , and Cr 3+ ) are known to emit NIR above 1000 nm. − Ni 2+ has a 3d 8 electronic configuration, and its 3 T 2 (3F) → 3 A 2 (3F) leads to a broadband NIR-II (1000–1700 nm) emission with a large full width at half-maximum (fwhm) of ∼300 nm. Its emission is known to be sensitive to the microenvironment of the crystal field it occupies in the octahedron of the host material.…”

Section: Introductionmentioning

confidence: 99%

Strategy of Charge Compensation for High-Performance Ni²⁺-Activated MgAl₂O₄ Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

Deng,

Zhu,

Gao

et al. 2024

Inorg. Chem.

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Near-infrared (NIR) phosphor conversion light-emitting diodes (pc-LEDs) have great application potential as NIR light sources in many fields such as food analysis, night vision illumination, and bioimaging for noninvasive medical diagnosis. In general, phosphors synthesized by a high-temperature solidphase method have large particle sizes and have to be processed to fine powders by a grinding process, which may introduce surface defects and lower the luminous efficiency. Here, we report a sol−gel sintering method with ammonium nitrate and citric acid as the sacrificing agents to synthesize high purity, nanosized (less than 50 nm) Zr 4+ /Ni 2+ codoped MgAl 2 O 4 spinel NIR phosphors, in which MgAl 2 O 4 spinel is the matrix, Ni 2+ is the luminous center, and Zr 4+ acts as the charge compensator. We systematically characterized the crystal structures and NIR luminescence properties of the Ni 2+ -doped MgAl 2 O 4 and the Zr 4+ /Ni 2+ codoped MgAl 2 O 4 . Under 390 nm light excitation, the emission spectrum of the Ni 2+ -doped MgAl 2 O 4 phosphor covers 900−1600 nm, the half-peak width is 251 nm, and the peak position is located at 1230 nm. We demonstrated that by incorporating small amounts of Zr 4+ as the charge compensator, the NIR emission intensity of the Zr 4+ /Ni 2+ codoped MgAl 2 O 4 nanosized phosphor was doubled over that of the Ni 2+ -doped MgAl 2 O 4 phosphor. The optimal content of the charge compensator was 2 mol %. More importantly, the inclusion of Zr 4+ led to a NIR phosphor with improved thermal stability in luminous properties, and the luminous intensity measured at 100 °C was 33.83% of that measured at room temperature (20 °C). This study demonstrates that NIR phosphor nanomaterials with high-purity and enhanced optical properties can be designed and synthesized through the charge compensation strategy by a sol−gel sintering method.

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“…Crystal lattice, especially when the crystalline phase is fluoride, prevents them from luminescence concentration quenching due to clusters of RE 3+ ions forming [ 17 , 18 , 19 ]. Furthermore, if there are heavy atoms in the structure of the nanocrystals, an additional factor appears in the amorphous matrix that reduces the phonon energy of the matrix what consequently promotes RE 3+ radiative transitions, keeping all the benefits of the glass matrix at the same time [ 17 , 20 , 21 , 22 , 23 ]. Much research has been related to the existence of PbF 2 nanocrystals in the borate matrix [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

From Structure to Luminescent Properties of B2O3-Bi2O3-SrF2 Glass and Glass-Ceramics Doped with Eu3+ Ions

et al. 2021

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Glass-ceramics with the composition B2O3-Bi2O3-SrF2 were synthesized by the conventional melt-quenching technique and subsequent crystallization of the parental glasses. The temperature at which the ceramization was carried out was selected based on differential scanning calorimetry (DSC) analysis. The structure of the studied materials and the formation of SrF2 nanocrystals were confirmed by the Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. It was found that the amount of strontium fluoride introduced into the parental borate-bismuth glass has a significant impact on the growth of SrF2 nanocrystals. In particular, the influence of the crystalline SrF2 phase on luminescence intensity and kinetics was studied using Eu2O3-doped samples. An increase in luminescence intensity was observed in the samples in which SrF2 nanocrystals were formed. This is most likely related to the fact that some of the Eu3+ ions were (after annealing of the glass) located in the crystalline structure of strontium fluoride. This was confirmed both by the luminescence lifetime obtained based on the luminescence decay curves and the calculated Judd–Ofelt parameters, Ω2 and Ω4. The results achieved confirm that the glasses and glass-ceramics described in this work could be considered as a new phosphor for light-emitting diodes (LEDs).

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Effect of heat treatment mechanism on upconversion luminescence in Er 3+ /Yb 3+ co-doped NaYF 4 oxyfluoride glass-ceramics

Cited by 31 publications

References 11 publications

Upconversion from fluorophosphate glasses prepared with NaYF₄:Er³⁺,Yb³⁺ nanocrystals

Upconversion from fluorophosphate glasses prepared with NaYF₄:Er³⁺,Yb³⁺ nanocrystals

Strategy of Charge Compensation for High-Performance Ni²⁺-Activated MgAl₂O₄ Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

From Structure to Luminescent Properties of B2O3-Bi2O3-SrF2 Glass and Glass-Ceramics Doped with Eu3+ Ions

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Effect of heat treatment mechanism on upconversion luminescence in Er 3+ /Yb 3+ co-doped NaYF 4 oxyfluoride glass-ceramics

Cited by 31 publications

References 11 publications

Upconversion from fluorophosphate glasses prepared with NaYF4:Er3+,Yb3+ nanocrystals

Upconversion from fluorophosphate glasses prepared with NaYF4:Er3+,Yb3+ nanocrystals

Strategy of Charge Compensation for High-Performance Ni2+-Activated MgAl2O4 Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

From Structure to Luminescent Properties of B2O3-Bi2O3-SrF2 Glass and Glass-Ceramics Doped with Eu3+ Ions

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Resources

About

Upconversion from fluorophosphate glasses prepared with NaYF₄:Er³⁺,Yb³⁺ nanocrystals

Upconversion from fluorophosphate glasses prepared with NaYF₄:Er³⁺,Yb³⁺ nanocrystals

Strategy of Charge Compensation for High-Performance Ni²⁺-Activated MgAl₂O₄ Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method