Dataset Information

Diffusing Mn⁴⁺ into Dy³⁺ Doped SrAl₂O₄ for Full-Color Tunable Emissions.

ABSTRACT: Dy³⁺ and Mn⁴⁺ codoped SrAl₂O₄ (SrAl₂O₄:Dy³⁺,Mn⁴⁺) phosphors were obtained by diffusing Mn⁴⁺ ions into Dy³⁺-doped SrAl₂O₄ via the constant-source diffusion technique. The influences of diffusion temperature and diffusion time on the emissions of SrAl₂O₄:Dy³⁺,Mn⁴⁺ were investigated. It was found that: (i) efficient red emission peaking at 651 nm can be readily achieved for SrAl₂O₄:Dy³⁺ by simply diffusing Mn⁴⁺ into SrAl₂O₄:Dy³⁺ at 800 °C and above; (ii) the red emission of Mn⁴⁺ becomes dominant over the characteristic emissions of Dy³⁺ when the diffusion temperature is 900 °C or higher; and (iii) the intensity of the red emission of SrAl₂O₄:Dy³⁺,Mn⁴⁺ is far more sensitive to diffusion temperature than to diffusion time. Our results have demonstrated that full-color tunable emissions can be realized for SrAl₂O₄:Dy³⁺, Mn⁴⁺ by tuning the parameters of diffusion temperature and diffusion time, which opens up a space for realizing easy color control of Dy³⁺-doped inorganic materials.

SUBMITTER: Zhai BG

PROVIDER: S-EPMC9696492 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature

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Diffusing Mn4+ into Dy3+ Doped SrAl2O4 for Full-Color Tunable Emissions.

Zhai Bao-Gai BG Chen Meng Meng MM Huang Yuan Ming YM

Materials (Basel, Switzerland) 20221117 22

Dy3+ and Mn4+ codoped SrAl2O4 (SrAl2O4:Dy3+,Mn4+) phosphors were obtained by diffusing Mn4+ ions into Dy3+-doped SrAl2O4 via the constant-source diffusion technique. The influences of diffusion temperature and diffusion time on the emissions of SrAl2O4:Dy3+,Mn4+ were investigated. It was found that: (i) efficient red emiss ...[more]

PMID: 36431655

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Project description:Lanthanide (Ln3+)-doped upconversion (UC) phosphors converting near-infrared (NIR) light to visible light hold very high promise toward biomedical applications. The scientific findings on luminescent thermometers revealed their superiority for noninvasive thermal sensing. However, only few reports showcase their potential for applications in extreme conditions (temperatures below -70 °C) restricted by low thermal sensitivity. Here, we demonstrate the tailoring of luminescence properties via introducing Ho3+-Mn2+ energy transfer (ET) routes with judicious codoping of Mn2+ ions in ZnAl2O4/Ho3+,Yb3+ phosphor. Preferentially, a singular red UC emission is required to improve the bioimaging sensitivity and minimize tissue damage. We could attain UC emission with 94% red component by a two-photon UC process. Higher temperature annealing brings the color coordinates to the green domain, highlighting the potential for color-tunable luminescence switch. Moreover, this work investigates the thermometric properties of ZnAl2O4/Yb3+, Ho3+ in the range of 80-300 K and influence of inducing extra ET pathways by Mn2+ codoping. Interestingly, the luminescence intensities for nonthermally coupled (5F4,5S2) and the 5F5 radiative transitions of Ho3+ ions display opposite behavior at 80 and 300 K, which revealed competition between temperature-sensitive decay pathways. The codoping of Mn2+ ions is fruitful in causing a fourfold increase of absolute sensitivity. Notably, the color tunability from green through yellow to red is helpful in rough temperature estimation by naked eyes. The maximum relative (Sr) and absolute sensitivities (Sa) were estimated to be 1.89% K-1 (140 K) and 0.0734 K-1 (300 K), respectively. Even at 80 K, a Sa of 0.00447 K-1 and Sr of 0.6025% K-1 were achievable in our case, which are higher than most of the other Ln3+-based systems. The above-mentioned results demonstrate the potential of ZnAl2O4/Yb3+,Ho3+ for cryogenic optical thermometry and a strategy to design new Ln3+-based UC thermometers by taking advantage of ET routes.

Dataset Information

Diffusing Mn⁴⁺ into Dy³⁺ Doped SrAl₂O₄ for Full-Color Tunable Emissions.

Publications

Diffusing Mn<sup>4+</sup> into Dy<sup>3+</sup> Doped SrAl<sub>2</sub>O<sub>4</sub> for Full-Color Tunable Emissions.

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