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Insight into emission-tuning and luminescence thermal quenching investigations in NaLa1−xGdxCa4W2O12:Mn4+ phosphors via the ionic couple substitution of Na+ + Ln3+ (Ln = La, Gd) for 2Ca2+ in Ca6W2O12:Mn4+ for plant-cultivation LED applications

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Abstract

In this work, a series of novel NaLa1−xGdxCa4W2O12:Mn4+ (NL1−xGxCWO:Mn4+, x = 0–1) phosphors were synthesized using a high-temperature solid-state reaction approach. Unexpected intense red-far-red emissions were clearly observed after the ionic couple substitution of 2Ca2+ by Na+ + Ln3+ (Ln = La, Gd) in negligible-luminescence Ca6W2O12:Mn4+ upon ultraviolet (UV) excitation. Moreover, a maximal emission-tuning of Δλ = 28 nm (Δν = 582 cm−1) can be found by changing x from 0 to 1, which is ascribed to the different crystal field and covalence among them. In addition, the luminescence thermal quenching behaviors and thermal quenching mechanisms were investigated in detail in representative NLCWO:0.01Mn4+ and NGCWO:0.01Mn4+ phosphors. The results were used to initiate an ionic couple substitution strategy to enrich novel oxide hosts for Mn4+ luminescence and select an appropriate host with better thermal stability for plant-cultivation LED applications.

Graphical abstract: Insight into emission-tuning and luminescence thermal quenching investigations in NaLa1−xGdxCa4W2O12:Mn4+ phosphors via the ionic couple substitution of Na+ + Ln3+ (Ln = La, Gd) for 2Ca2+ in Ca6W2O12:Mn4+ for plant-cultivation LED applications

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Publication details

The article was received on 05 Jul 2019, accepted on 03 Sep 2019 and first published on 03 Sep 2019


Article type: Paper
DOI: 10.1039/C9DT02796C
Dalton Trans., 2019, Advance Article

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    Insight into emission-tuning and luminescence thermal quenching investigations in NaLa1−xGdxCa4W2O12:Mn4+ phosphors via the ionic couple substitution of Na+ + Ln3+ (Ln = La, Gd) for 2Ca2+ in Ca6W2O12:Mn4+ for plant-cultivation LED applications

    K. Li and R. Van Deun, Dalton Trans., 2019, Advance Article , DOI: 10.1039/C9DT02796C

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