Formation of Co2+-doped nanocrystals in La2O3–MgO–Al2O3–SiO2 glass-ceramics

Chen, Li; Yu, Chunlei; He, Deyan; Hu, Lili; Chen, Wei

doi:10.1016/j.jnoncrysol.2010.11.070

Cited by 7 publications

(8 citation statements)

References 18 publications

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“…Generally, the spectroscopic properties of Co ions depend on how and to whom they are coordinated according to the crystal field theory. Normally, Co ions in an oxygen-coordinated tetrahedral site show three absorption peaks at 590 nm ( 4 A 2 ( 4 F) → 4 T 1 ( 4 P)), 1.5 μm ( 4 A 2 ( 4 F) → 4 T 1 ( 4 F)), and 2.3 μm ( 4 A 2 ( 4 F) → 4 T 2 ( 4 F)) (Figure a), − while in the case of nitrogen-coordinated tetrahedral site (Figure a), in which the crystal field strength is stronger, these absorption peaks significantly shifted to around 570, 1100, and 3500 nm, respectively. − The absorption spectra of both C(ZIF-62: x Co 2+ ) and G(ZIF-62: x Co 2+ ) (Figure S11c,d) display peaks at 570 nm and 1.1 μm, confirming that the Co ions are in the nitrogen tetrahedral site. Moreover, the full width at half-maximum of the broad absorption peak (Figure c) at 1.1 μm slightly increases by Δλ = 35 nm as a result of the transformation of the prepared crystal into glass, while the absorption peak of Co doped glasses is usually much wider than those in crystalline materials .…”

Section: Resultsmentioning

confidence: 99%

Broad Mid-Infrared Luminescence in a Metal–Organic Framework Glass

et al. 2019

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Metal–organic framework (MOF) glasses are a newly discovered family of melt-quenched glasses. Despite considerable progress in understanding the nature of MOF glasses, their photonic functionalities have not been found so far. Here, we report on the first breakthrough regarding the photonic functionalities of MOF glasses, that is, finding of the luminescence in melt-quenched MOF glasses. The finding was achieved on a zeolitic imidazolate framework (ZIF) series, that is, the ZIF-62 series: Zn 1– x Co x (Im) 1.7 (bIm) 0.3 , x = 0, 0.1, and 0.5, where Co substitutes Zn in ZIF-62 forming single-phased solid solutions. Remarkably, we observed broadband mid-infrared (Mid-IR) luminescence (in the wavelength range of 1.5–4.8 μm) in both the crystalline and amorphous solid solutions. The intensity of the luminescence in ZIF glass is gradually enhanced by increasing the level of Co concentration. The observed Mid-IR emission originates from d–d transition of Co ions. The discovery of the luminescence in ZIF-62 glass may pave the way toward new photonic applications of bulk MOF glasses.

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Section: Resultsmentioning

confidence: 99%

Broad Mid-Infrared Luminescence in a Metal–Organic Framework Glass

et al. 2019

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“…Indeed, in the case of an oxygen-coordinated tetrahedral site, Co ions illustrate a broad absorption peak at 1500 nm. The unusual absorption peak at 1100 nm suggests that Co ions located at tetrahedral sites coordinated to N atoms (Figure c). − …”

Section: Results and Discussionmentioning

confidence: 99%

Nonlinear-Optical Response in Zeolitic Imidazolate Framework Glass

et al. 2020

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Recently, metal−organic frameworks (MOFs) have been confirmed to be stable in a vitreous state, thus stimulating growing interest in the discovery of the physicochemical properties of these newly explored types of glasses. Herein, we examine the nonlinearoptical (NLO) response of Zn-and Zn−Co-based zeolitic imidazolate framework-62 (ZIF-62) glasses using an open-aperture Z-scan technique. We reveal that the Zn-ZIF-62 glass does not characterize a saturable absorption feature (1030 nm femtosecond laser) owing to its low optical absorption in the near-infrared (NIR) spectral region. In contrast, a NIR absorption band (1100 nm) has been observed in Zn−Co-ZIF-62 glass, which exhibits a strong NLO response with a high modulation depth of 63.85%. We attribute the observed NLO response to transient saturation of the 4 T 1 ( 4 F) level of Co ions upon femtosecond laser excitation. The intriguing NLO properties of this MOF glass may enable potential applications in the photonics fields for sensing and optical modulation.

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“…3. For the LMAS glass, there was a broad band from 450 nm to 700 nm in visible range, while the absorption in NIR range was very weak, which indicated Co 2+ ions with a predominance of octahedral coordination [17]. The absorption spectra of GCs changed drastically from that of the glass.…”

Section: Absorption Spectramentioning

confidence: 95%

“…In our former studies, we reported that adding a certain amount of La 2 O 3 into MgO-Al 2 O 3 -SiO 2 glass can decrease the viscosity and improve the homogeneity of melt, while with little influence on thermal expansion coefficient [16,17]. In this work, the microstructure of La 2 O 3 -MgO-Al 2 O 3 -SiO 2 GCs was characterized.…”

Section: Introductionmentioning

confidence: 96%

Formation of Co2+-doped nanocrystals in La2O3–MgO–Al2O3–SiO2 glass-ceramics

Cited by 7 publications

References 18 publications

Broad Mid-Infrared Luminescence in a Metal–Organic Framework Glass

Broad Mid-Infrared Luminescence in a Metal–Organic Framework Glass

Nonlinear-Optical Response in Zeolitic Imidazolate Framework Glass

Spectroscopic properties of Co2+ ions in La2O3–MgO–Al2O3–SiO2 glass-ceramics

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