Enhanced green upconversion emission in NaYF4:Er3+/Yb3+/Li+ phosphors for optical thermometry

Dubey, Abhishek; Soni, Abhishek Kumar; Kumari, Ankita; Dey, Riya; Kumar, Vineet

doi:10.1016/j.jallcom.2016.09.154

Cited by 106 publications

(32 citation statements)

References 39 publications

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“…Presence of the Li ions during the reaction process may distort the crystal structure and lead to increase in the formation of substitutional defects, which may facilitate the incorporation of dopant ions into the system. [36][37][38][39] As an example, luminescent red Y(OH)3:Eu 3+ phosphors were fabricated via employing this method. Doping process and complete crystallization were achieved in 60 min.…”

Section: Introductionmentioning

confidence: 99%

Green fabrication of lanthanide-doped hydroxide-based phosphors: Y(OH)₃:Eu³⁺ nanoparticles for white light generation

Güner¹,

Kus²,

Özcan³

et al. 2019

Beilstein J. Nanotechnol.

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Phosphors can serve as color conversion layers to generate white light with varying optical features, including color rendering index (CRI), high correlated color temperature (CCT), and luminous efficacy. However, they are typically produced under harsh synthesis conditions such as high temperature, high pressure, and/or by employing a large amount of solvent. In this work, a facile, water-based, rapid method has been proposed to fabricate lanthanide-doped hydroxide-based phosphors. In this sense, sub-micrometer-sized Y(OH)3:Eu3+ particles (as red phosphor) were synthesized in water at ambient conditions in ≤60 min reaction time. The doping ratio was controlled from 2.5–20 mol %. Additionally, first principle calculations were performed on Y(OH)3:Eu3+ to understand the preferable doping scenario and its optoelectronic properties. As an application, these fabricated red phosphors were integrated into a PDMS/YAG:Ce3+ composite and used to generate white light. The resulting white light showed a remarkable improvement (≈24%) in terms of luminous efficiency, a slight reduction of CCT (from 3900 to 3600 K), and an unchanged CRI (≈60) as the amount of Y(OH)3:Eu3+ was increased.

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Section: Introductionmentioning

confidence: 99%

Green fabrication of lanthanide-doped hydroxide-based phosphors: Y(OH)₃:Eu³⁺ nanoparticles for white light generation

Güner¹,

Kus²,

Özcan³

et al. 2019

Beilstein J. Nanotechnol.

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“…In recent years, lanthanide (Ln 3+ ) and transition metal (TM) ions doped glass‐ceramics (GC) have gained much importance in the field of optical thermometric study . The Ln 3+ ‐doped based optical thermometers are primarily based on temperature correlated fluorescence intensity ratio (FIR) of thermally coupled energy levels, such as 2 H 11/2 and 4 S 3/2 of Er 3+ ions .…”

Section: Introductionmentioning

confidence: 99%

Multi‐phase glass‐ceramics containing CaF₂: Er³⁺ and ZnAl₂O₄:Cr³⁺ nanocrystals for optical temperature sensing

Wadhwa

Wang

et al. 2018

J Am Ceram Soc

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Oxyfluoride transparent glass-ceramics (GC) containing CaF 2 and ZnAl 2 O 4 nanocrystals have been fabricated with melt-quenching method. By carrying out the heat treatment of the precursor glass (PG), Er 3+ and Cr 3+ were selectively partitioned into CaF 2 and ZnAl 2 O 4 nanocrystals, respectively. The obtained multiphase GC exhibited strong upconversion (UC) fluorescence of Er 3+ as well as intense down-conversion (DC) fluorescence of Cr 3+ . Under 980 nm excitation, the green UC fluorescence of Er 3+ due to 2 H 11/2 , 4 S 3/2 → 4 I 15/2 transition and the red DC fluorescence lifetime of Cr 3+ due to 2 E, 4 T 2 → 4 A 2 transition were found to be highly dependent on the temperature and makes them possibly suitable for Optical Thermometry. With least-square fitting methods, the FIR of Er 3+ from thermally coupled energy states ( 2 H 11/2 and 4 S 3/2 ) produced maximum temperature sensing sensitivity values of 0.33% K −1 at 437 K and 0.36% K −1 at 267 K, respectively. Similarly, fluorescence lifetime of Cr 3+ attributed to the parity forbidden ( 2 E → 4 A 2 ) and spin allowed ( 4 T 2 → 4 A 2 ) produced the maximum temperature sensor sensitivity value equal to 0.67% K −1 at 535 K. K E Y W O R D Sfluorescence, multi-phase glass-ceramics, optical temperature sensing, rare earths, transition metals, upconversion

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“…Spectroscopy parameters, such as emission intensity, emission peak position, emission band width, and fluorescent lifetime, are usually adopted to evaluate the temperature change in samples and understand the thermal effects induced by laser diode (LD). The temperature sensors based on fluorescence intensity ratio (FIR) of 2 H 11/2 / 4 S 3/2 → 4 I 15/2 of Er 3+ ions are currently the hot temperature probe . However, the indirect measurement system uses multiple fitting calculations to calibrate the temperature, which inevitably results in inaccurate measurement of the temperature.…”

Section: Introductionmentioning

confidence: 99%

“…4 I 15/2 of Er 3+ ions are currently the hot temperature probe. 8,9 However, the indirect measurement system uses multiple fitting calculations to calibrate the temperature, which inevitably results in inaccurate measurement of the temperature. In this work, the thermal effects of Er/Yb-doped NaYF 4 phosphor induced by 980/1510 nm LD irradiation were investigated using an infrared thermal imaging technology with real-time online monitoring.…”

Section: Introductionmentioning

confidence: 99%

Thermal effects of Er³⁺/Yb³⁺‐doped NaYF₄ phosphor induced by 980/1510 nm laser diode irradiation

et al. 2017

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The thermal effects of Er/Yb‐doped NaYF4 phosphor induced by 980/1510 nm laser diode irradiation were intuitively and contrastively investigated using an infrared thermal imaging technology with real‐time online monitoring. The Yb3+/Er3+ codoped materials have strong thermal effects and high‐temperature elevation under 980 nm irradiation. However, the severe thermal effects of materials with higher Er3+ ion doping concentration are remarkably attributed to the cross relaxation between the Er3+ ions under 980 nm irradiation. The energy transfer between Er3+ and Yb3+ ions in Er3+/Yb3+‐codoped materials also contributes to the thermal effects under 1510 nm laser diode irradiation. Under the same testing conditions, the temperature elevation ∆T of samples induced by 1510 nm laser diode irradiation is lower than that induced by 980 nm laser diode irradiation. The temperature rising rate and elevation ∆T value of samples depend on the ion doping concentration and power density of the laser diode excitation. The internal temperature of the samples exhibits deep temperature gradient under 980/1510 nm laser diode irradiation. By comparing the two kinds of thermometry methods, the temperature value calculated by fluorescence intensity ratio is almost similar to that obtained through infrared thermal imaging technology under higher excitation power pumping.

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Enhanced green upconversion emission in NaYF4:Er3+/Yb3+/Li+ phosphors for optical thermometry

Cited by 106 publications

References 39 publications

Green fabrication of lanthanide-doped hydroxide-based phosphors: Y(OH)₃:Eu³⁺ nanoparticles for white light generation

Green fabrication of lanthanide-doped hydroxide-based phosphors: Y(OH)₃:Eu³⁺ nanoparticles for white light generation

Multi‐phase glass‐ceramics containing CaF₂: Er³⁺ and ZnAl₂O₄:Cr³⁺ nanocrystals for optical temperature sensing

Thermal effects of Er³⁺/Yb³⁺‐doped NaYF₄ phosphor induced by 980/1510 nm laser diode irradiation

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Enhanced green upconversion emission in NaYF4:Er3+/Yb3+/Li+ phosphors for optical thermometry

Cited by 106 publications

References 39 publications

Green fabrication of lanthanide-doped hydroxide-based phosphors: Y(OH)3:Eu3+ nanoparticles for white light generation

Green fabrication of lanthanide-doped hydroxide-based phosphors: Y(OH)3:Eu3+ nanoparticles for white light generation

Multi‐phase glass‐ceramics containing CaF2: Er3+ and ZnAl2O4:Cr3+ nanocrystals for optical temperature sensing

Thermal effects of Er3+/Yb3+‐doped NaYF4 phosphor induced by 980/1510 nm laser diode irradiation

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Green fabrication of lanthanide-doped hydroxide-based phosphors: Y(OH)₃:Eu³⁺ nanoparticles for white light generation

Green fabrication of lanthanide-doped hydroxide-based phosphors: Y(OH)₃:Eu³⁺ nanoparticles for white light generation

Multi‐phase glass‐ceramics containing CaF₂: Er³⁺ and ZnAl₂O₄:Cr³⁺ nanocrystals for optical temperature sensing

Thermal effects of Er³⁺/Yb³⁺‐doped NaYF₄ phosphor induced by 980/1510 nm laser diode irradiation