Design of core/active-shell NaYF4:Ln3+@NaYF4:Yb3+ nanophosphors with enhanced red-green-blue upconversion luminescence for anti-counterfeiting printing

Gong, Guo; Ye, Song; Tan, Haihu; Xie, Songhai; Zhang, Changfan; Xu, Ling; Xu, Jianxiong; Zheng, Jie

doi:10.1016/j.compositesb.2019.107504

Cited by 59 publications

(20 citation statements)

References 70 publications

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“…In this case, the willingly studied pathway for generation a white light is related to the mixing of three primary colors-red, green and blue (RGB)-in optical materials. Such red-green-blue multicolor visible light can be achieved via up-conversion of near-infrared radiation (NIR) [3][4][5][6][7] or via the conversion of near-ultraviolet (NUV) photons [8][9][10]. Since rare-earth ions (RE 3+ ) exhibit a broad range of emission in the visible (VIS) spectral scope via interactions with NIR and NUV irradiation, they are considered as essential parts in the development of white-light-emitting RGB materials [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Since rare-earth ions (RE 3+ ) exhibit a broad range of emission in the visible (VIS) spectral scope via interactions with NIR and NUV irradiation, they are considered as essential parts in the development of white-light-emitting RGB materials [11,12]. The first of abovementioned ways of generating RGB emission can be realized via NIR up-conversion excitation in doubly (e.g., Yb 3+ /Er 3+ [3,4], Yb 3+ /Tm 3+ [4]) and triply doped (e.g., Yb 3+ /Er 3+ /Tm 3+ [5,6], Tb 3+ /Tm 3+ /Yb 3+ [7]) optical systems. For example, for Yb 3+ /Er 3+ /Tm 3+ triply doped β-NaYF 4 microrods, Er 3+ ions are responsible for the generation of red (the 4 F 9/2 → 4 I 15/2 transition) as well as green (the 2 H 11/2 → 4 I 15/2 and the 4 S 3/2 → 4 I 15/2 transitions) emissions through a two-photon absorption process involved in Yb 3+ → Er 3+ energy transfer.…”

Section: Introductionmentioning

confidence: 99%

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Energy Transfer Study on Tb3+/Eu3+ Co-Activated Sol-Gel Glass-Ceramic Materials Containing MF3 (M = Y, La) Nanocrystals for NUV Optoelectronic Devices

2020

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In the present work, the Tb3+/Eu3+ co-activated sol-gel glass-ceramic materials (GCs) containing MF3 (M = Y, La) nanocrystals were fabricated during controlled heat-treatment of silicate xerogels at 350 °C. The studies of Tb3+ → Eu3+ energy transfer process (ET) were performed by excitation and emission spectra along with luminescence decay analysis. The co-activated xerogels and GCs exhibit multicolor emission originated from 4fn–4fn optical transitions of Tb3+ (5D4 → 7FJ, J = 6–3) as well as Eu3+ ions (5D0 → 7FJ, J = 0–4). Based on recorded decay curves, it was found that there is a significant prolongation in luminescence lifetimes of the 5D4 (Tb3+) and the 5D0 (Eu3+) levels after the controlled heat-treatment of xerogels. Moreover, for both types of prepared GCs, an increase in ET efficiency was also observed (from ηET ≈ 16% for xerogels up to ηET = 37.3% for SiO2-YF3 GCs and ηET = 60.8% for SiO2-LaF3 GCs). The changes in photoluminescence behavior of rare-earth (RE3+) dopants clearly evidenced their partial segregation inside low-phonon energy fluoride environment. The obtained results suggest that prepared SiO2-MF3:Tb3+, Eu3+ GC materials could be considered for use as optical elements in RGB-lighting optoelectronic devices operating under near-ultraviolet (NUV) excitation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy Transfer Study on Tb3+/Eu3+ Co-Activated Sol-Gel Glass-Ceramic Materials Containing MF3 (M = Y, La) Nanocrystals for NUV Optoelectronic Devices

2020

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“…Anti-counterfeiting technology is of great importance in protecting valuable items including banknotes, tickets, diplomas, luxury products and certificates [32][33][34][35][36][37][38]. Comparing with the luminescent materials with a firm emission color, lanthanide-doped UC NCs featuring with excitation power-dependent multi-color variation is much more suitable to be exploited as anti-counterfeiting labels owing to the difficulty of duplication.…”

Section: Characterizationsmentioning

confidence: 99%

Pumping-controlled multicolor modulation of upconversion emission for dual-mode dynamic anti-counterfeiting

et al. 2020

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Lanthanide up-conversion features stepwise multi-photon processes, where the difference in photon number that is required for specific up-conversion process usually leads to significant variance in pumping-related processes/properties. In this work, a pumping-controlled dual-mode anti-counterfeiting strategy is conceived by taking advantage of the combination of up-conversion processes with different photon numbers. The combination of Er3+ and Tm3+, which are spatially separated within a designed core/triple-shell nano-architecture, is taken as an example to illustrate such idea. Upon infrared excitation, the emission color of a designed pattern can be switched from red to purple by increasing the excitation power density from 5 to 11 W/cm2, while a bright luminescent trajectory including red, white and blue-green color with different length is observed when rotating the pattern above 600 rpm. In addition, the relative up-conversion emission intensities of the Er3+ and Tm3+ ions can be manipulated through tailoring interfacial or inner defects in the core/triple-shell nano-crystals, which enable an ultrahigh sensitivity for the pumping-controlled emission color variation to be observed under excitation power well below 11 W/cm2.

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“…Moreover, the high-resolution XPS spectrum at the range of 111 eV to 96 eV showed an obvious Si 2p (Figure 4d) peak at 104.18 eV, demonstrating that the THMS/15WO 3 film contains Si element. X-ray photoelectron spectroscopy (XPS) measurements [47] were performed to analyze the surface elemental composition and the valence state of the main elements in the THMS/WO3 films. The XPS survey spectrum of THMS/15WO3 film showed that the hybrid film contains C, W, O, elements since the peaks at specific binding energy of 285.00 eV, 36.12 eV, and 531.00 eV were successfully detected, as shown in Figure 4a.…”

Section: Fabrication Of Thms/wo 3 Hybrid Filmsmentioning

confidence: 99%

Electrodeposition of Ti-Doped Hierarchically Mesoporous Silica Microspheres/Tungsten Oxide Nanocrystallines Hybrid Films and Their Electrochromic Performance

Zhang

et al. 2019

Nanomaterials

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In this paper, a novel Ti-doped hierarchically mesoporous silica microspheres/tungsten oxide (THMS/WO3) hybrid film was prepared by simultaneous electrodeposition of Ti-doped hierarchically mesoporous silica microspheres (THMSs) and WO3 nanocrystallines onto the fluoride doped tin dioxide (FTO) coated glass substrate. It is demonstrated that the incorporation of THMSs resulted in the hybrid film with improved electrochromic property. Besides, the content of THMSs plays an important role on the electrochromic property of the hybrid film. An excellent electrochromic THMS/WO3 hybrid film with good optical modulation (52.00% at 700 nm), high coloration efficiency (88.84 cm2 C−1 at 700 nm), and superior cycling stability can be prepared by keeping the weight ratio of Na2WO4·2H2O (precursor of WO3):THMSs at 15:1. The outstanding electrochromic performances of the THMS/WO3 hybrid film were mainly attributed to the porous structure, which facilitates the charge-transfer, promotes the electrolyte infiltration and alleviates the expansion of the film during Li+ insertion. This kind of porous THMS/WO3 hybrid film is promising for a wide range of applications in smart homes, green buildings, airplanes, and automobiles.

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Design of core/active-shell NaYF4:Ln3+@NaYF4:Yb3+ nanophosphors with enhanced red-green-blue upconversion luminescence for anti-counterfeiting printing

Cited by 59 publications

References 70 publications

Energy Transfer Study on Tb3+/Eu3+ Co-Activated Sol-Gel Glass-Ceramic Materials Containing MF3 (M = Y, La) Nanocrystals for NUV Optoelectronic Devices

Energy Transfer Study on Tb3+/Eu3+ Co-Activated Sol-Gel Glass-Ceramic Materials Containing MF3 (M = Y, La) Nanocrystals for NUV Optoelectronic Devices

Pumping-controlled multicolor modulation of upconversion emission for dual-mode dynamic anti-counterfeiting

Electrodeposition of Ti-Doped Hierarchically Mesoporous Silica Microspheres/Tungsten Oxide Nanocrystallines Hybrid Films and Their Electrochromic Performance

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