Multi-Band Up-Converted Lasing Behavior in NaYF4:Yb/Er Nanocrystals

Peng, Ya-Pei; Lü, Wei; Ren, Pengpeng; Ni, Yiquan; Wang, Yunfeng; Yan, Peiguang; Zeng, Yu‐Jia; Zhang, Wenfei; Ruan, Shuangchen

doi:10.3390/nano8070497

Cited by 19 publications

(6 citation statements)

References 47 publications

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“…The radiative depopulation of those levels back to the ground state leads to appearance of green UC emission bands at 520 and 545 nm corresponding to 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions of Er 3+ ions, respectively (Fig. 6f) 15 . Additionally, the electrons from the 4 S 3/2 level of Er 3+ ions can be nonradiatively relaxed to the 4 Figure 6.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, the upconversion luminescence of rare-earth ions (RE 3+ ) doped fluoride nanomaterials has received much attention due to their potential applications in various fields such as bioimaging, biolabeling, photodynamic therapy, as drug carriers, optical temperature sensors, etc. [11][12][13][14][15][16][17][18] . In the case of the optical temperature sensing applications, researchers focused especially on the sodium yttrium fluoride nanoparticles doped or co-doped with rare earth ions (NaYF 4 :RE 3+ nanoparticles) [19][20][21][22][23][24] , among which the NaYF 4 :Er 3+ , Yb 3+ nanoparticles were regarded as one of the most efficient upconversion materials for temperature sensing due to their unique luminescence properties and the large energy gap between two thermally coupled 2 H 11/2 and 4 S 3/2 energy levels [25][26][27] .…”

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confidence: 99%

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Fabrication and characterization of up-converting β-NaYF4:Er3+,Yb3+@NaYF4 core–shell nanoparticles for temperature sensing applications

Giang

Trejgis

Marciniak

et al. 2020

Sci Rep

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this paper presents the use of soft template method to synthesize core and core-shell up-converting nanoparticles usefull for temperature sensing applications. Based on the stock solutions of core β-NaYF 4 :er 3+ ,Yb 3+ nanoparticles and involving soft template method without any additional process of surface functionalization, it is possible to directly design the core-shell β-NaYF 4 :er 3+ ,Yb 3+ @naYf 4 nanoparticles, which can be perfectly dispersed in cyclohexane and surfactants like oleic acid (oA), triethanolamine (teA) or cetyltrimethylammonium bromide (ctAB). the morphological, crystalline and elemental characteristics of samples were investigated by field emission Scanning electron Microscopy, X-Ray Diffraction, High Resolution Transmission Electron Microscopy, Selected Area Electron Diffraction patterns and Energy-Dispersive X-Ray Spectroscopy (EDX) measurements. The results showed that the synthesized naYf 4 :er 3+ ,Yb 3+ @naYf 4 core-shell nanoparticles have roughly spherical shape, pure hexagonal β phase with core size of about 35 ± 5 nm and shell thickness of about 40 ± 5 nm. It has been shown that the coating of the β-NaYF 4 :er 3+ ,Yb 3+ core with naYf 4 shell layer enables to enhance the green upconversion (Uc) emission intensities in respect to red one. Under 976 nm excitation, the synthesized β-NaYF 4 :2%Er 3+ ,19%Yb 3+ @naYf 4 core-shell nanoparticles revealed three strong emission bands at 520 nm, 545 nm and 650 nm corresponding to 2 H 11/2 , 4 S 3/2 and 4 f 9/2 to 4 i 15/2 transitions of er 3+ ions with the lifetimes of 215, 193 and 474 µs, respectively. The calculated cie chromaticity coordinates proved that the emission colour of core-shell nanoparticles was changed from red into yellowish green upon increasing the power density of the 976 nm laser from 0.73 to 9.95 W/cm 2. The calculated slopes indicated that in the β-NaYF 4 :2%Er 3+ ,19%Yb 3+ @naYf 4 core-shell nanoparticles, two-photon and three-photon Uc processes took place simultaneously. Although the former one is similar as in the case of β-NaYF 4 :er 3+ ,Yb 3+ bare core nanoparticles, the latter one, three-photon Uc process for green emission occurs, due to cross relaxation processes of two er 3+ ions only within nanoparticles with core-shell architecture. Moreover, the energy difference between the 2 H 11/2 and 4 S 3/2 levels and associated constant of naYf 4 @naYf 4 host lattice were determined and they reached ~ 813 cm −1 and 14.27 (r 2 = 0.998), respectively. In order to investigate the suitability of nanoparticles for optical temperature sensing, the emission spectra were measured in a wide temperature range from 158 to 298 K. An exceptionally high value of relative sensitivity was obtained at 158 K and it amounted to 4.25% K −1. further temperature increase resulted in gradual

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Fabrication and characterization of up-converting β-NaYF4:Er3+,Yb3+@NaYF4 core–shell nanoparticles for temperature sensing applications

Giang

Trejgis

Marciniak

et al. 2020

Sci Rep

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“…Theoretically, by simply optimizing the composition of Er 3+ and Yb 3+ dopants, the NIR lifetime of Er 3+ can be prolonged or shortened, achieving bidirectional and large-scale lifetime tuning . Specifically, the ET of Yb 3+ to Er 3+ is slower compared to the inherent decay of Er 3+ , which enables the extension of Er 3+ fluorescence lifetime. , On the other hand, excessive Yb 3+ may result in backward ET from Er 3+ to Yb 3+ , followed by the energy trapping of the quenching centers; the lifetime of Er 3+ can be shortened. , In addition, Er 3+ upconversion processes from its NIR emitting state will also decrease the lifetime …”

Section: Introductionmentioning

confidence: 99%

Bidirectional Lifetime Tuning of Er 1530 nm Emission Induced by Yb

Li,

Wang,

Ehtesham

et al. 2024

ACS Omega

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Wide-range NIR lifetimes of lanthanide ion-doped nanocrystals are highly desired for numerous bioapplications. As one of the most promising NIR emission bands, the lifetime of Er 3+ at 1.5 μm can be as long as ∼10 ms and be greatly shortened by increasing the doping level of either activator Er 3+ or sensitizer Yb 3+ . However, the shortened lifetime is mostly accompanied by the quenching effects, highly restraining the light signal intensity. Alternatively, prolonging the lifetime of Er 3+ NIR lifetime without luminescence quenching is of vital significance as it raises the upper limit of the lifetime range and maintains the effective signal intensity. In this work, we revealed that Yb 3+ can bidirectionally tune the NIR lifetime of Er 3+ . By introducing Yb 3+ , in addition to the substantially improved luminescence intensities, the prolonged NIR lifetime can be generated in low-Er 3+ -doped NaYF 4 nanocrystals, while monotonously decreased lifetime appears in Er 3+ heavily doped nanocrystals. To investigate the mechanisms of this bidirectional lifetime tuning and meanwhile avoid additional structural influences, the size and morphology of nanocrystals with different doping compositions were controlled to be similar. The decay dynamics of Er 3+ NIR emissions of different nanocrystals were simulated to explain the effects of Yb 3+ . This work provides insights into the manipulation of the NIR lifetime in Er 3+ /Yb 3+ -codoped nanocrystals.

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“…As of late one can find increasing interest in the lasers, which instead of monocrystals, use transparent ceramic nanopowders received by sintering at high temperatures and under high pressure. The rare earth doped YAG nanopowders are the active medium of random lasers [45][46][47][48][49], where the feedback of the emitted radiation is obtained not owing to the optical resonator, but due to multiple reflection from the individual crystal grain surfaces forming the nanopowders. Very bright radiation emitted by random-type laser does not exhibit spatial coherence and thus can be used to illuminate objects in optical microscopy, because it does not produce interference bands.…”

Section: Introductionmentioning

confidence: 99%

Structural, optical and magnetic properties of Y_3−0.02−xEr_0.02Yb _x Al₅O₁₂ (0 < x < 0.20) nanocrystals: effect of Yb content

Kamińska

Jankowski²,

Sikora

et al. 2020

Nanotechnology

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The paramagnetic Y3−0.02−x Er0.02Yb x Al5O12 (x = 0.02, 0.06, 0.10, 0.12, 0.18, 0.20) nanocrystals (NCs) were synthesized by the microwave-induced solution combustion method. The XRD, TEM and SEM techniques were applied to determine the NCs’ structures and sizes. The XRD patterns confirmed that the NCs have for the most part a regular structure of the Y3Al5O12 (YAG) phase. The changes of the distance between donor Yb3+ (sensitizer) and acceptor Er3+ (activator) were realized by changing the donor’s concentration with a constant amount of acceptor. Under 980 nm excitation, at room temperature, the NCs exhibited strong red emission near 660 and 675 nm, and green upconversion emission at 550 nm, corresponding to the intra 4f transitions of Er3+ (4F9/2, 2H11/2, 4S3/2) → Er3+ (4I15/2). The strongest emission was observed in a sample containing 18% Yb3+ ions. The red and green emission intensities are respectively about 5 and 12 times higher as compared to NCs doped with 2% of Yb3+. In order to prove that the main factor responsible for the increase of the upconversion luminescence efficiency is reduction of the distance between Yb3+ and Er3+, we examined, for the first time the influence of hydrostatic pressure on luminescence and luminescence decay time of the radiative transitions inside donor ion. The decrease of both luminescence intensity and luminescence decay times, with increasing hydrostatic pressure was observed. After applying hydrostatic pressure to samples with e.g. 2% and 6% Yb3+, the distance between the donor and acceptor decreases. However, for higher concentrations of the donor, this distance is smaller, and this leads to the effective energy transfer to Er3+ ions. With increasing pressure, the maximum intensity of near infrared emission is observed at 1029, 1038 and 1047 nm, what corresponds to 2F5/2 → 2F7/2 transition of Yb3+.

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Multi-Band Up-Converted Lasing Behavior in NaYF4:Yb/Er Nanocrystals

Cited by 19 publications

References 47 publications

Fabrication and characterization of up-converting β-NaYF4:Er3+,Yb3+@NaYF4 core–shell nanoparticles for temperature sensing applications

Fabrication and characterization of up-converting β-NaYF4:Er3+,Yb3+@NaYF4 core–shell nanoparticles for temperature sensing applications

Bidirectional Lifetime Tuning of Er 1530 nm Emission Induced by Yb

Structural, optical and magnetic properties of Y_3−0.02−xEr_0.02Yb _x Al₅O₁₂ (0 < x < 0.20) nanocrystals: effect of Yb content

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Multi-Band Up-Converted Lasing Behavior in NaYF4:Yb/Er Nanocrystals

Cited by 19 publications

References 47 publications

Fabrication and characterization of up-converting β-NaYF4:Er3+,Yb3+@NaYF4 core–shell nanoparticles for temperature sensing applications

Fabrication and characterization of up-converting β-NaYF4:Er3+,Yb3+@NaYF4 core–shell nanoparticles for temperature sensing applications

Bidirectional Lifetime Tuning of Er 1530 nm Emission Induced by Yb

Structural, optical and magnetic properties of Y3−0.02−xEr0.02Yb x Al5O12 (0 < x < 0.20) nanocrystals: effect of Yb content

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Product

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Structural, optical and magnetic properties of Y_3−0.02−xEr_0.02Yb _x Al₅O₁₂ (0 < x < 0.20) nanocrystals: effect of Yb content