Energy transfer and cross-relaxation induced multicolor upconversion emissions in Er3+/Tm3+/Yb3+ doped double perovskite La2ZnTiO6 phosphors

Wu, Youfusheng; Lai, Fengqin; Liu, Bin; Li, Zhibiao; Liang, Tongxiang; Qiang, Yaochun; Huang, Jingyu; Ye, Xinyu; You, Weixiong

doi:10.1016/j.jre.2019.02.013

Cited by 29 publications

(5 citation statements)

References 49 publications

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“…Until recently, RE doped double perovskite materials are reported with UC phenomenon. [ 49,50 ] In our work, it is noted that the Yb 3+ /Er 3+ co‐doped samples RE‐1, RE‐2, and RE‐3 emit UC PL of Yb 3+ /Er 3+ ions (Figure 2g). Under the excitation of NIR laser (980 nm), the three Yb 3+ /Er 3+ co‐doped samples all emit three characteristic peaks of Er 3+ at 527 nm, 555 nm, and 660 nm, and the corresponding energy level transitions are 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 , and 4 F 9/2 → 4 I 15/2 , respectively.…”

Section: Figurementioning

confidence: 58%

Multimodal Luminescent Yb³⁺/Er³⁺/Bi³⁺‐Doped Perovskite Single Crystals for X‐ray Detection and Anti‐Counterfeiting

et al. 2020

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luminescence, and also the recent hologram technique. [1-3] Compared to other conventional techniques, the fluorescence printing patterns supply promising high security to the key information valuable documents due to the tunable emission properties. [4,5] As counterfeiting technology has also been quickly developed, the traditional mono-mode anti-counterfeiting is far from the requirement of practical applications to guarantee a high level of data and information safety. The traditional anti-counterfeiting luminescence is achieved by the mono-mode downshifting (DS) luminescence, which converts the high energy photon into lower energy luminescence. To address such concern, developing more complicated anti-counterfeiting techniques by increasing the luminescent modes becomes the most challenging topic. Presently, the realization of concurrent upconversion (UC) and DS have been successfully utilized in anti-counterfeiting based on the lanthanide-based dopants. [6-9] The Eu-doped down-shift luminescent materials have been applied in the Euro banknotes, which enables the visible photoluminescence (PL) based on UV lamp excitation. Meanwhile, the Bank of China also introduced the Yb/Er-doped UC phosphors in the banknotes as the counterfeiting technique, which emits the Anti-counterfeiting techniques have become a global topic since they is correlated to the information and data safety, in which multimodal luminescence is one of the most desirable candidates for practical applications. However, it is a long-standing challenge to actualize robust multimodal luminescence with high thermal stability and humid resistance. Conventionally, the multimodal luminescence is usually achieved by the combination of upconversion and downshifting luminescence, which only responds to the electromagnetic waves in a limited range. Herein, the Yb 3+ /Er 3+ /Bi 3+ co-doped Cs 2 Ag 0.6 Na 0.4 InCl 6 perovskite material is reported as an efficient multimodal luminescence material. Beyond the excitation of ultraviolet light and nearinfrared laser (980 nm), this work extends multimodal luminescence to the excitation of X-ray. Besides the flexible excitation sources, this material also shows the exceptional luminescence performance, in which the X-ray detection limit reaches the level of nGy s −1 , indicating a great potential for further application as a colorless pigment in the anti-counterfeiting field. More importantly, the obtained double perovskite features high stability against both humidity and temperature up to 400 °C. This integrated multifunctional luminescent material provides a new directional solution for the development of multifunctional optical materials and devices.

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Section: Figurementioning

confidence: 58%

Multimodal Luminescent Yb³⁺/Er³⁺/Bi³⁺‐Doped Perovskite Single Crystals for X‐ray Detection and Anti‐Counterfeiting

et al. 2020

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“…Figure 3(c) shows the pump‐power dependence of the UC intensity measured by varying the 980 nm laser diode power. In general, the relationship between UC emission intensity ( I f ) and pump power ( P ) is expressed by the following equation [ 24,25 ] :

I_{f} \propto P^{n}

where, I f is the UC emission intensity, P is the laser power intensity, and n is the number of pumping photons required to excite the upper emitting state. The n value is obtained from the slope of the linear fit from typical double‐logarithmic plots of UC intensities ( I f ) versus laser power intensity ( P ).…”

Section: Resultsmentioning

confidence: 99%

“…[ 20,27,28 ] Therefore, photon energy was increased to the 4 S 3/2 energy level, resulting in strong UC green emission. [ 24,29 ] As the Ho 3+ ion concentration increased, the total UC intensity decreased, and the characteristics of Er 3+ ion fluorescence also decreased. Sample f (NaYF 4 :Yb 3+ 0.18 /Er 3+ 0.02 /Ho 3+ 0.03 ) gave a result that matched the NaYF 4 :Yb 3+ /Ho 3+ spectrum characteristics.…”

Section: Resultsmentioning

confidence: 99%

Improvement of luminescence properties of NaYF₄:Yb³⁺/Er³⁺ upconversion materials by a cross‐relaxation mechanism based on co‐doped Ho³⁺ ion concentrations

2021

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NaYF4:Yb3+/Er3+/Ho3+ nanophosphors were successfully synthesized using a solvothermal method and with various concentrations of Ho3+ ions. The crystal structure, grain size, morphology, and luminescence properties were analyzed by X‐ray diffraction, field‐emission scanning electron microscopy, and photoluminescence measurements. All samples were crystallized as a cubic structure; it was confirmed that all samples exhibited strong green emission and weak red emission generated at a particular level of the activated ions. The strongest upconversion fluorescence intensity was observed in the Ho3+ and Er3+ ions co‐doped NaYF4 materials with a Ho3+ ion concentration of 0.005 mol. Only the green fluorescence intensity at the 542 nm centre increased strongly due to the 4S3/2→4I15/2 energy transfer. This increase in upconversion fluorescence intensity at a selected wavelength was described as a cross‐relaxation mechanism due to the addition of Ho3+ ions.

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“…20%Yb 3+ /2%Er 3+ @NaYbF 4 核-壳-壳微米核壳结构的(101)衍射峰强度强于(110)衍射峰强度, 表明包覆多层壳层后微米晶体优先沿a轴方向生长 (如图2插图所示) [24] . 传递 [26] .…”

Section: Nayf 4 :20%ybunclassified

Energy transfer characteristics of single-particle NaYF4 core-shell structure

Gao¹,

Zhang²,

Han³

et al. 2022

Acta Phys. Sin.

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The construction of rare-earth doped micro/nano core-shell structure is not only beneficial to enhance the upconversion emission intensity, but also can realize the fine control of luminescence color through the spatial separation of ions. In this work, a series of NaYF4@NaYF4 core-shell (CS) microcrystals doped with different ion concentrations were constructed by means of epitaxial growth technology. The structure and morphology of the prepared microcrystals were characterized by X-ray diffractometer (XRD) and scanning electron microscope (SEM). The experimental results show that the prepared CS structures had a pure hexagonal-phase crystal structure, and exhibited a disk-like shape. Under the excitation of 980 nm laser, the energy transfer characteristics of doped ions in single CS microcrystals were carefully studied by using a confocal microscope spectroscopy test system and changing the excitation position. The study shows that the ions doped in different regions of the CS microdisks exhibit different spectral characteristics when the excitation position is changed, which is mainly due to the different directions of excitation energy transfer in the CS structure. Based on the emission spectra of different positions and power variation spectra, it is proved that the excitation energy of the micron CS is mainly transmitted from outside to inside. Meanwhile, the colorful emission pattern of the CS microdisk is revealed by the corresponding optical waveguide model, which is mainly due to the Optical waveguide effect. Therefore, by constructing different micron core-shell structures, the luminescence characteristics of microcrystals can be controlled and adjusted, and the application of microcrystals in optoelectronic devices, optical coding and multicolor display can be provided with important experimental reference.

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Energy transfer and cross-relaxation induced multicolor upconversion emissions in Er3+/Tm3+/Yb3+ doped double perovskite La2ZnTiO6 phosphors

Cited by 29 publications

References 49 publications

Multimodal Luminescent Yb³⁺/Er³⁺/Bi³⁺‐Doped Perovskite Single Crystals for X‐ray Detection and Anti‐Counterfeiting

Multimodal Luminescent Yb³⁺/Er³⁺/Bi³⁺‐Doped Perovskite Single Crystals for X‐ray Detection and Anti‐Counterfeiting

Improvement of luminescence properties of NaYF₄:Yb³⁺/Er³⁺ upconversion materials by a cross‐relaxation mechanism based on co‐doped Ho³⁺ ion concentrations

Energy transfer characteristics of single-particle NaYF<sub>4</sub> core-shell structure

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Energy transfer and cross-relaxation induced multicolor upconversion emissions in Er3+/Tm3+/Yb3+ doped double perovskite La2ZnTiO6 phosphors

Cited by 29 publications

References 49 publications

Multimodal Luminescent Yb3+/Er3+/Bi3+‐Doped Perovskite Single Crystals for X‐ray Detection and Anti‐Counterfeiting

Multimodal Luminescent Yb3+/Er3+/Bi3+‐Doped Perovskite Single Crystals for X‐ray Detection and Anti‐Counterfeiting

Improvement of luminescence properties of NaYF4:Yb3+/Er3+ upconversion materials by a cross‐relaxation mechanism based on co‐doped Ho3+ ion concentrations

Energy transfer characteristics of single-particle NaYF<sub>4</sub> core-shell structure

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Multimodal Luminescent Yb³⁺/Er³⁺/Bi³⁺‐Doped Perovskite Single Crystals for X‐ray Detection and Anti‐Counterfeiting

Multimodal Luminescent Yb³⁺/Er³⁺/Bi³⁺‐Doped Perovskite Single Crystals for X‐ray Detection and Anti‐Counterfeiting

Improvement of luminescence properties of NaYF₄:Yb³⁺/Er³⁺ upconversion materials by a cross‐relaxation mechanism based on co‐doped Ho³⁺ ion concentrations