Study on the color tunability and energy transfer mechanism in Tb3+, Sm3+ co-doped LiLaSiO4 phosphors

Wu, Xiulan; Du, Liang; Ren, Qiang

doi:10.1016/j.cap.2021.04.002

Cited by 23 publications

(5 citation statements)

References 52 publications

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“…It was worth noting that the QY of LZOT:NH 4 Cl (4 wt. %) NPs was greater than some other green-emitting phosphors, such as Sr 3 Gd 1.9 (Si 3 O 9 ) 2 :0.1 Tb 3+ (26.6%) 99 , LiLaSiO 4 :0.08 Tb 3+ ,0.04Sm 3+ (22.34%) 100 . In addition, the temperature-dependent emission spectra of LZOT:NH 4 Cl (4 wt.…”

Section: Resultsmentioning

confidence: 80%

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

Lavanya

Darshan

Malleshappa

et al. 2022

Sci Rep

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Engineering a single material with multidirectional applications is crucial for improving productivity, low cost, flexibility, least power consumption, etc. To achieve these requirements, novel design structures and high-performance materials are in urgent need. Lanthanide-doped nanophosphors have the greatest strengths and ability in order to tune their applications in various dimensions. However, applications of nanophosphor in latent fingerprints visualization, anti-counterfeiting, and luminescent gels/films are still in their infancy. This study demonstrated a simple strategy to enhance the luminescence of Tb3+ (1–11 mol %) doped La2Zr2O7 nanophosphors by conjugating various fluxes via a simple solution combustion route. The photoluminescence emission spectra reveal intense peaks at ~ 491, 546, 587, and 622 nm, which arises from 5D4 → 7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ions, respectively. The highest emission intensity was achieved in the NH4Cl flux assisted nanophosphor as compared to NaBr and NH4F assisted samples. The colorimetric images of fingerprints visualized using the optimized nanophosphor on forensic related surfaces exhibit level –III ridge details, including sweat pores, the width of the ridges, bifurcation angle, and the successive distance between sweat pores, etc. These results are decisive parameters that clearly support the statement “no two persons have ever been found to have the same fingerprints”. The anti-counterfeiting security ink was formulated using optimized nanophosphor and various patterns were designed by simple screen printing and dip pen technologies. The encoded information was decrypted only under ultraviolet 254 nm light. All the designed patterns are exhibit not just what it looks/feel like and how better it works. As a synergetic contribution of enhanced luminescence of the prepared nanophosphor, the green-emissive films were fabricated, which display excellent flexibility, uniformity, and transparency in the normal and ultraviolet 254 nm light illumination. The aforementioned results revealed that the prepared NH4Cl flux-assisted La2Zr2O7: Tb3+(7 mol %) NPs are considered to be the best candidate for multi-dimensional applications.

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Section: Resultsmentioning

confidence: 80%

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

Lavanya

Darshan

Malleshappa

et al. 2022

Sci Rep

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“…Besides, the QY values of the Ca 2 Sb 2 O 7 , Ca 1.6 Sr 0.4 Sb 2 O 7 , Ca 1.2 Sr 0.8 Sb 2 O 7 , Ca 0.8 Sr 1.2 Sb 2 O 7 , Ca 0.4 Sr 1.6 Sb 2 O 7 , and Sr 2 Sb 2 O 7 phosphors were measured to be 60.04%, 49.94%, 37.68%, 27.20%, 16.38%, and 20.52%, respectively, as shown in Figure S11(a‐f). Particularly, the QY value of the self‐host emitting Ca 2 Sb 2 O 7 material could reach 60.04%, which is more excellent compared to some reported luminescent activators‐doped phosphors, such as Sr 2 LuTaO 6 :Mn 4+ (37%), 47 Li 4 AlSbO 6 :Mn 4+ (54.8%), 48 Ca 2 LaTaO 6 :Bi 3+ /Dy 3+ (36.51%), 49 Ca 2 Ga 2 GeO 7 :Eu 3+ (26.47%), 50 LiLaSiO 4 :Tb 3+ /Sm 3+ (22.34%), 51 LiLaSiO 4 :Tm 3+ /Tb 3+ (39.8%), 52 NaMgBO 3 :Ce 3+ /Tb 3+ (54.28%), 53 Na 2 BaCa(PO 4 ) 2 :Ce 3+ /Tb 3+ (41.6%), 54 and Y 2 Mo 3 O 12 :Yb 3+ /Er 3+ (13.6%) 55 …”

Section: Resultsmentioning

confidence: 81%

Effects of activated Sr ²⁺ ion content on strong blue‐emitting Ca ₂ Sb ₂ O ₇ materials for high‐quality WLED devices

Hua

Dang

Wang

et al. 2022

Intl J of Energy Research

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Summary In this report, the luminescent performances of the self‐host blue‐emitting Ca2Sb2O7 materials were investigated in terms of the sintering temperature and the dopant Sr2+ ion content. The emission intensity was enhanced with an increase of the sintering temperature as well as the lattice parameters. After doping the Sr2+ ions (>1.2 mol%), the emission spectra of Ca2Sb2O7 materials would be redshifted. The blue‐emitting color (Ca2Sb2O7) turned into greenish‐blue (Sr2+@1.6 mol%) and green (Sr2+@2 mol%) colors in sequence. In light of these interesting findings, the crystal structure, elemental composition, morphology, thermal stability, luminescent dynamics, luminescent efficiency, etc were investigated and compared. Finally, the mini‐white lighting‐emitting diodes (WLEDs) based on the blue‐emitting Ca2Sb2O7, greenish‐blue‐emitting Ca0.4Sr1.6Sb2O7, and green‐emitting Sr2Sb2O7 phosphors were fabricated by mixing commercial phosphors (CP). Especially, the Ca2Sb2O7‐CP‐WLED and Sr2Sb2O7‐CP‐WLED devices exhibited a warm white light with good correlated color temperature (<3200 K) and excellent color‐rendering index (>88). All the above results suggested that the self‐host emitting materials of Sr2+ activated Ca2Sb2O7 with color‐tunable properties could be very promising for solid‐state lighting applications.

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“…Simultaneously, part of electrons at the excited level (4f 7 5d 1 ) are transferred to the 7 G 7/2 energy level of Sm 3+ ions, and then released to the ground state for the contribution of 595 nm emission. According to the Dexter energy level transfer of multilevel interaction, which can be explained through the following formula: [28][29][30]…”

Section: Resultsmentioning

confidence: 99%

Stable Multimode Luminescence Performances of SrGa₁₂O₁₉: Sm³⁺, Tb³⁺ Phosphor for Anti-Counterfeiting Application

Gu¹,

Wang²,

Ma³

et al. 2022

ECS J. Solid State Sci. Technol.

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Fluorescence materials have been widely employed for anti-counterfeiting techniques owing to their high-throughput, facile identification, and simplicity of production. However, the stability of the materials is a prerequisite for their subsequent application. Here, a series of SrGa12O19: Sm3+, Tb3+ phosphors with multi-color luminescence are obtained successfully by the traditional solid-state method. These Sm3+/Tb3+ co-doped phosphors emit green, orange, and yellow-green under the excitation of 254, 365, and 254 nm+365 nm ultraviolet (UV) lamps, respectively. After removal of the UV lamp, the green long persistent luminescence (LPL) phenomenon is exhibited and then vanishes 15 s later. The dynamic PL and LPL are associated with the interaction between PL and trapping centers. Notably, as-obtained phosphors show excellent stability against both air, water, and high temperature, which makes the as-obtained phosphors a great application potential in high-level anti-counterfeiting with high stability.

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Study on the color tunability and energy transfer mechanism in Tb3+, Sm3+ co-doped LiLaSiO4 phosphors

Cited by 23 publications

References 52 publications

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

Effects of activated Sr ²⁺ ion content on strong blue‐emitting Ca ₂ Sb ₂ O ₇ materials for high‐quality WLED devices

Stable Multimode Luminescence Performances of SrGa₁₂O₁₉: Sm³⁺, Tb³⁺ Phosphor for Anti-Counterfeiting Application

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Study on the color tunability and energy transfer mechanism in Tb3+, Sm3+ co-doped LiLaSiO4 phosphors

Cited by 23 publications

References 52 publications

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

One material, many possibilities via enrichment of luminescence in La2Zr2O7:Tb3+ nanophosphors for forensic stimuli aided applications

Effects of activated Sr 2+ ion content on strong blue‐emitting Ca 2 Sb 2 O 7 materials for high‐quality WLED devices

Stable Multimode Luminescence Performances of SrGa12O19: Sm3+, Tb3+ Phosphor for Anti-Counterfeiting Application

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Product

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Effects of activated Sr ²⁺ ion content on strong blue‐emitting Ca ₂ Sb ₂ O ₇ materials for high‐quality WLED devices

Stable Multimode Luminescence Performances of SrGa₁₂O₁₉: Sm³⁺, Tb³⁺ Phosphor for Anti-Counterfeiting Application