Ground state depletion – A step towards mid-IR lasing of doped silver halides

Tsur, Yuval; Goldring, Sharone; Galun, Ehud; Katzir, Abraham

doi:10.1016/j.jlumin.2016.02.030

Cited by 5 publications

(1 citation statement)

References 15 publications

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“…The observed high structural ordering around Co ions ZIF-62 glass as well as the coupling with rotational and other low energy vibration modes of the organic linkers may strongly suppress the rate of nonradiative relaxation process, allowing ZIF-62 glass containing Co ions to emit Mid-IR luminescence. − This may explain the detection of Mid-IR emission of ZIF-62 glass containing Co ions compared to any other glasses. In comparison with other Mid-IR luminescent Co-doped materials, there are many crystals doped with Co that demonstrate Mid-IR emission such as mixed halides (AgCl x Br 1– x :Co (3.5–5.2 μm)), fluorides (MgF 2 :Co (1.6–2.1 μm)), and sulfides (ZnS:Co (2.5–4 μm)). ,− These Mid-IR luminescent crystals illustrate broad emission bands especially in case of Co-doped mixed halides and sulfides, which cover only about 1.7 μm or less of the Mid-IR range. However, the melt-quenched ZIF-62 glass containing Co ions is characterized by broad Mid-IR luminescence, which covers about 3.3 μm (i.e.…”

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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