Radiative properties of Er3+ doped and Er3+/Yb3+co-doped Sr3Al2O6 phosphors: exploring the usefulness as a phosphor material

Singh, Vijay; Seshadri, M.; Singh, N.; Mohapatra, M.

doi:10.1007/s10854-018-00569-2

Cited by 11 publications

(10 citation statements)

References 30 publications

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“…The direct band gap has been evaluated as 3.43 and 3.62 eV for these optimized Er 3+ (6 mol %)-doped La 2 (WO 4 ) 3 and Yb 3+ (6 mol %)/Er 3+ (6 mol %)-doped La 2 (WO 4 ) 3 phosphors, respectively, as shown in Figure S4b,d. The band gap enhancement is observed in the co-doped sample, which is ascribed to the formation of defects in the prepared sample by introduction of Yb 3+ ions in the co-doped sample …”

Section: Results and Discussionmentioning

confidence: 94%

“…The band gap enhancement is observed in the co-doped sample, which is ascribed to the formation of defects in the prepared sample by introduction of Yb 3+ ions in the co-doped sample. 26 Upconversion and NIR Photoluminescence Investigation of Er 3+ -Doped La 2 (WO 4 ) 3 . To explore the upconversion emission performance, upconversion emission spectra were recorded using 980 nm diode laser excitation at different concentrations of Er 3+ ion-doped La 2 (WO 4 ) 3 nanophosphors in the visible light range, as depicted in Figure 2a.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Biocompatible Yb³⁺/Er³⁺ Co-activated La₂(WO₄)₃ Upconversion Nanophosphors for Optical Thermometry, Biofluorescent, and Anticancer Agents

Kang

Lim

et al. 2022

Inorg. Chem.

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Non-cytotoxic upconversion nanocrystals are preferred candidates because they offer exceptional advantages for numerous applications, ranging from optical thermometry to bioimaging/biomedical applications. In this report, we demonstrate the luminescence characteristics and practical utility of a multifunctional upconversion nanophosphor based on Yb3+/Er3+:La2(WO4)3 (LWO) flakes. Strong upconversion green emission was observed from 6-mol % Er3+-doped LWO nanophosphor flakes excited by a 980 nm laser. We further enhanced the upconversion emission considerably by co-doping LWO nanophosphors with Yb3+/Er3+ to exploit energy migration from Yb3+ to Er3+ ions. The exceptional improvement in upconversion green and near-infrared emission was achieved by Yb3+ ion co-doping up to 6 mol %; beyond 6 mol %, emission intensities remarkably dropped due to concentration quenching. Photometric parameters were evaluated with and without Yb3+ ion-doped LWO nanophosphors, which exhibited a high green color purity of 95.6%, to elucidate their energy transfer mechanism. In addition, temperature-dependent upconversion emission trends were evaluated by analyzing the fluorescence intensity ratio, exhibiting higher temperature sensitivity than that previously reported. This suggests the applicability of our proposed nanophosphors to optical thermometry. As for bioimaging applications, the non-cytotoxicity of the optimized nanophosphor was confirmed based on distinct fluorescence images of a normal fibroblast cell line (L929). Furthermore, we demonstrated the strong cytotoxicity of nanophosphors against human colon cancer (HCT-116) cells. Based on the results, non-cytotoxic Yb3+(6 mol %)/Er3+ (6 mol %):LWO upconversion nanophosphor flakes are expected to be exceptional candidates owing to their extensive suitability to the fields of upconversion lasers, optical thermometry, and biomedical and anticancer applications. The results indicate the potential of upconversion materials in the effective execution of multiple strategic applications.

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Section: Results and Discussionmentioning

confidence: 94%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Biocompatible Yb³⁺/Er³⁺ Co-activated La₂(WO₄)₃ Upconversion Nanophosphors for Optical Thermometry, Biofluorescent, and Anticancer Agents

Kang

Lim

et al. 2022

Inorg. Chem.

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“…Figure 2c depicts the absorption spectrum (inset) of the CaZnGe 2 O 6 host, and its band gap is calculated to be 4.72 eV based on the theory of Mott and Davis. 18,19 Figure 2d exhibits the XRD patterns of the typical CaZnGe 2 O 6 /xMn 2+ (x = 0, 0.3, and 0.6%) samples, and the XRD patterns of other ion-doped samples are exhibited in Figure S1. It suggests that all XRD patterns can be well indexed according to the standard card no.…”

Section: Methodsmentioning

confidence: 99%

Advanced Luminescence Anticounterfeiting Based on Dynamic Photoluminescence and Non-Pre-Irradiation Mechanoluminescence

Wang

Dong

et al. 2022

Inorg. Chem.

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Luminescence anticounterfeiting is one of the most significant technologies to protect information security. However, the luminescence of the present anticounterfeiting logo is static, which is easily counterfeited by substitutes, and it always requires an ultraviolet lamp in use, which is inconvenient in application. In this work, according to the present deficiencies of luminescence anticounterfeiting, an interesting phosphor CaZnGe2O6/Mn2+ with unique features of dynamic photoluminescence and non-pre-irradiation mechanoluminescence is developed for the first time. The photoluminescence color of the phosphor can dynamically change from green to red during irradiation, and the non-pre-irradiation mechanoluminescence of the phosphor-based elastomer can be easily stimulated by mechanics such as stretching, bending, or scratching with a finger. By combining the two features of the CaZnGe2O6/Mn2+ phosphor, an advanced dual-mode luminescence anticounterfeiting is designed, and a luminescence logo is fabricated for the anticounterfeiting test. The result demonstrates that this advanced luminescence anticounterfeiting based on the phosphor is not only safer but also more convenient in application.

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“…Field emission scanning electron microscopy was used to observe the microstructures of the BaMgSiO 4 :Yb 3+ ,Tb 3+ ceramics. The absorption spectra of the ceramics were measured by diffuse reflectance mode using a 4100 spectrophotometer equipped with an integrating sphere, and the BaSO 4 was as a reference sample. The UCL spectra of the BaMgSiO 4 :Yb 3+ ,Tb 3+ ceramics were measured under 980 nm excitation (HITACHIU‐F‐7000).…”

Section: Methodsmentioning

confidence: 99%

Reversible Upconversion Luminescence Modification Based on Photochromism in BaMgSiO₄:Yb³⁺,Tb³⁺ Ceramics for Anti‐Counterfeiting Applications

Ren

Yang

et al. 2019

Advanced Optical Materials

141

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Reversible upconversion luminescence modification based on photochromism has received considerable interest due to its potential applications in optical storage and high‐sensitivity optical switches. However, stimulation‐induced bleaching by an external thermal field is generally used for photochromism‐induced reversible upconversion luminescence modification, which limits its practical application. In this work, a gray BaMgSiO4:Yb3+,Tb3+ ceramic is prepared, exhibiting the photochromism from gray to pink color when stimulated by 254 nm light. Interestingly, the pink BaMgSiO4:Yb3+,Tb3+ ceramic can be bleached by either a 473 nm laser or thermal stimulation. The reversible change between gray and pink color exhibits excellent reproducibility over several cycles by alternating between 254 and 473 nm (or thermal) light stimulation. The influence of the reversible photochromism of the BaMgSiO4:Yb3+,Tb3+ ceramic on its upconversion luminescence is investigated. Reversible modification of the upconversion luminescence is demonstrated by alternating between 254 and 473 nm (or thermal) light stimulation. For reversible modulation of the upconversion luminescence, excellent reproducibility is realized after several cycles. As an example, the application of the BaMgSiO4:Yb3+,Tb3+ photochromic ceramic as an anti‐counterfeiting agent is described.

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Radiative properties of Er3+ doped and Er3+/Yb3+co-doped Sr3Al2O6 phosphors: exploring the usefulness as a phosphor material

Cited by 11 publications

References 30 publications

Biocompatible Yb³⁺/Er³⁺ Co-activated La₂(WO₄)₃ Upconversion Nanophosphors for Optical Thermometry, Biofluorescent, and Anticancer Agents

Biocompatible Yb³⁺/Er³⁺ Co-activated La₂(WO₄)₃ Upconversion Nanophosphors for Optical Thermometry, Biofluorescent, and Anticancer Agents

Advanced Luminescence Anticounterfeiting Based on Dynamic Photoluminescence and Non-Pre-Irradiation Mechanoluminescence

Reversible Upconversion Luminescence Modification Based on Photochromism in BaMgSiO₄:Yb³⁺,Tb³⁺ Ceramics for Anti‐Counterfeiting Applications

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Radiative properties of Er3+ doped and Er3+/Yb3+co-doped Sr3Al2O6 phosphors: exploring the usefulness as a phosphor material

Cited by 11 publications

References 30 publications

Biocompatible Yb3+/Er3+ Co-activated La2(WO4)3 Upconversion Nanophosphors for Optical Thermometry, Biofluorescent, and Anticancer Agents

Biocompatible Yb3+/Er3+ Co-activated La2(WO4)3 Upconversion Nanophosphors for Optical Thermometry, Biofluorescent, and Anticancer Agents

Advanced Luminescence Anticounterfeiting Based on Dynamic Photoluminescence and Non-Pre-Irradiation Mechanoluminescence

Reversible Upconversion Luminescence Modification Based on Photochromism in BaMgSiO4:Yb3+,Tb3+ Ceramics for Anti‐Counterfeiting Applications

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Biocompatible Yb³⁺/Er³⁺ Co-activated La₂(WO₄)₃ Upconversion Nanophosphors for Optical Thermometry, Biofluorescent, and Anticancer Agents

Biocompatible Yb³⁺/Er³⁺ Co-activated La₂(WO₄)₃ Upconversion Nanophosphors for Optical Thermometry, Biofluorescent, and Anticancer Agents

Reversible Upconversion Luminescence Modification Based on Photochromism in BaMgSiO₄:Yb³⁺,Tb³⁺ Ceramics for Anti‐Counterfeiting Applications