Single-band red upconversion luminescence of Yb <sup>3+</sup> -Er <sup>3+</sup> via nonequivalent substitution in perovskite KMgF <inf>3</inf> nanocrystals

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Journal Article
Journal of Materials Chemistry C, 2016, 4 (8), pp. 1675 - 1684
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© The Royal Society of Chemistry 2016. Single-band red upconversion (UC) emission of Er 3+ has been successfully achieved in Yb 3+ /Er 3+ codoped KMgF 3 nanocrystals via a nonequivalent substitution strategy, in which lanthanide ions probably aggregate, as evidenced by density functional theory calculations and upconversion dynamic processes. The aggregation of Yb 3+ /Er 3+ would cause large cross-relaxation probabilities among the lanthanide ions when photo-excited, resulting in the disappearance of the green emission and the population of the red emitting level of Er 3+ . Interestingly, the single-band feature is independent of the dopant concentration and pump power. The possible UC mechanism is discussed in detail according to nanocrystal morphology, ion radii, lattice parameters and decay lifetime studies of the Yb 3+ -Er 3+ doped analogous compounds (KMgF 3 , KZnF 3 and KCdF 3 ). It could be concluded that Yb 3+ /Er 3+ ions tend to aggregate in KMgF 3 , resulting in the largest ratio of red to green UC emission. This research may give a perspective toward tuning the UC emission of lanthanide ions.
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