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Hughes-Currie, Rosa B.; Senanayake, Pubudu S.; Wells, Jon‐Paul R.; Reid, Michael F.; Berden, Giel; Reeves, Roger J.; Meijerink, Andries

doi:10.1103/physrevb.88.104304

Cited by 16 publications

(23 citation statements)

References 16 publications

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“…The analysis is similar to our analysis for NaMgF 3 :Yb 2þ in Ref. 13. While for NaMgF 3 :Yb 2þ trap liberation by the IR pulse was found to be crucial to modeling the transients, it is different for SrF 2 :Yb 2þ where trap liberations only play a role for the sharp low-energy transitions (Sec.…”

Section: Exciton Dynamicssupporting

confidence: 70%

“…As shown in Fig. 3(b), when the G 3 (fs) parameter is set to zero, the 2 F 7=2 multiplet of 4f 13 is split into E 00 ; U 0 , and E 0 irreducible representations of the octahedral group by the cubic crystal-field. 21 As G 3 (fs) is increased, these states couple with 2 S (from the delocalized s-like electron).…”

Section: (Fs) ¼ 7278 CMmentioning

confidence: 99%

“…Our previous work has illustrated this technique. 12,13 In this paper, we utilize the transient photoluminescence enhancement to experimentally determine the energy level structure of the ITE in SrF 2 crystals doped with Yb 2þ . The dynamics of the induced enhancement are described and modeled in detail.…”

Section: Introductionmentioning

confidence: 99%

“…We also attribute the sharp lines to intra-excitonic transitions. Since they are sharp, they cannot involve a change in bonding, thus they must be a result of excitations in the localized 4f 13 core (or "hole state"). Following Ref.…”

mentioning

confidence: 99%

“…Following Ref. 12, we use the following Hamiltonian for a 4f 13 configuration coupled to an s electron in a cubic crystal field:…”

mentioning

confidence: 99%

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Frequency non-degenerate sequential excitation of the impurity trapped exciton in strontium fluoride crystals doped with ytterbium

Senanayake

Wells

Reid

et al. 2015

Journal of Applied Physics

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We model the dynamic behaviour observed for impurity-trapped excitons in SrF 2 :Yb 2þ using transient photoluminescence enhancement induced via a two-frequency, sequential excitation process employing an UV optical parametric amplifier synchronized to an IR free electron laser (FEL). We observe sharp transitions interpreted as a change of state of the localized hole and broad bands interpreted as a change of state of the delocalized electron. Our modeling indicates that the 4f crystal-field interaction is 25% smaller than in CaF 2 . The photoluminescence enhancement transients are analyzed across a range of excitation frequencies using a system of rate equations. The temporal behavior is explained in terms of intra-excitonic relaxation, local lattice heating by the FEL, and liberation of electrons from trap states. V C 2015 AIP Publishing LLC. [http://dx

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Section: Exciton Dynamicssupporting

confidence: 70%

Section: (Fs) ¼ 7278 CMmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

“…Following Ref. 12, we use the following Hamiltonian for a 4f 13 configuration coupled to an s electron in a cubic crystal field:…”

mentioning

confidence: 99%

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Frequency non-degenerate sequential excitation of the impurity trapped exciton in strontium fluoride crystals doped with ytterbium

Senanayake

Wells

Reid

et al. 2015

Journal of Applied Physics

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Tailoring of White Luminescence in a NaLi₃SiO₄:Eu²⁺ Phosphor Containing Broad‐Band Defect‐Induced Charge‐Transfer Emission

et al. 2021

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overcome reabsorption and different degradation rates during the long-term operation of mixed multicolor phosphors, and significant efforts have been made to design such single-phased white light emitters. [1] Several activators can be codoped into a single system to introduce multiple luminescence centers with complementary emission colors. [2] White light can also be realized through broadband emission from self-trapped excitons (STEs) that exist in metal halides with localized carriers and a soft lattice. [3] In rare earth phosphors, the doping of several rare-earth ions often results in poor luminescence efficiency. [2] Another feasible method is to modify the chemical composition to induce diverse local environments for a given type of activator. [4] Nevertheless, a new design principle for white emission is urgently needed for lighting applications. Recently, divalent europium (Eu 2+ )-doped UCr 4 C 4 -type phosphors have emerged as a new class of promising narrowband emitters which demonstrate exceptional performance for lighting and backlit display applications. [5] The emission colors cover a wide spectral range from blue to red, with various compositions and structures of host lattices. Blue, cyan, and green emissions have been observed in various oxide-based UCr 4 C 4type phosphors, [6] and red emission has been detected in nitride and oxynitride phosphors. [5c,7] Most of these phosphors exhibit one narrow-band emission, while some exhibit several emission peaks or overlapping broad bands due to multiple cation sites, such as KLi 3 SiO 4 :Eu 2+ with K1 and K2 sites (λ em = 457 and 580 nm) and RbNa 2 K(Li 3 SiO 4 ) 4 :Eu 2+ with Rb, K1, and Na2 sites (λ em = 480 and 530 nm). [6d,e] Nevertheless, it is still a challenge to achieve multiple emission peaks in a single-phase UCr 4 C 4type phosphor to cover the entire visible region, for example, to achieve longer-wavelength emissions in oxide-based phosphors. The luminescence spectra can be tuned by modifying the cuboid size and/or the coordination environment to generate a stronger crystal field strength and/or nephelauxetic effect around the activator Eu 2+ ions. [8] However, these strategies are generally difficult because of the highly condensed structure of the rigid UCr 4 C 4 host.In principle, when a defect is present in the vicinity of Eu 2+ with its electronic levels lower than the emitting Eu 2+ 5d level, an excited 5d electron can jump to lower defect levels, forming a charge-transfer (CT) state. [9] This state is not stable and can Single-component materials with white-light emission are ideal for lighting applications. However, it is very challenging to achieve white luminescence in single-dopant activated solid phosphors. Herein, white NaLi 3 Si 1−x O 4 :Eu 2+ materials are designed via defect engineering and synthesized by reducing the Si content (0.15 ≤ x ≤ 0.25). Stochiometric NaLi 3 SiO 4 :Eu 2+ exhibits a narrow-band blue emission at 469 nm, ascribed to the 5d → 4f transition of Eu 2+ at highly symmetric cuboid Na sites, while sam...

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Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃

Singh¹,

Belsare²,

Moharil

2021

Luminescence

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NaMgF3‐based phosphors have been described frequently in the literature. Their synthesis faces difficulties typical of fluoride materials. A simple precipitation synthesis for NaMgF3‐based phosphors is described in this paper. This consisted of mixing aq. NaF and MgCl2/MgSO4 solutions. Various activators could be incorporated by adding the required salts during this process. Characteristic emission of the activators was observed in the prepared phosphors. As‐prepared samples exhibited predominantly trivalent lanthanide emission. After thermal treatment in a reductive atmosphere, europium‐doped samples showed the intense emission of Eu2+. By virtue of the intense nature of the emission, lifetime measurements could be made for this sample. Notably, intense thermoluminescence and optically stimulated luminescence were observed in NaMgF3:Eu. A simple, fast method for the synthesis of NaMgF3 was therefore developed.

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Site-selective transient photoluminescence enhancement of impurity-trapped excitons in NaMgF3:Yb2+

Cited by 16 publications

References 16 publications

Frequency non-degenerate sequential excitation of the impurity trapped exciton in strontium fluoride crystals doped with ytterbium

Frequency non-degenerate sequential excitation of the impurity trapped exciton in strontium fluoride crystals doped with ytterbium

Tailoring of White Luminescence in a NaLi₃SiO₄:Eu²⁺ Phosphor Containing Broad‐Band Defect‐Induced Charge‐Transfer Emission

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃

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Site-selective transient photoluminescence enhancement of impurity-trapped excitons in NaMgF3:Yb2+

Cited by 16 publications

References 16 publications

Frequency non-degenerate sequential excitation of the impurity trapped exciton in strontium fluoride crystals doped with ytterbium

Frequency non-degenerate sequential excitation of the impurity trapped exciton in strontium fluoride crystals doped with ytterbium

Tailoring of White Luminescence in a NaLi3SiO4:Eu2+ Phosphor Containing Broad‐Band Defect‐Induced Charge‐Transfer Emission

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF3

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Product

Resources

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Tailoring of White Luminescence in a NaLi₃SiO₄:Eu²⁺ Phosphor Containing Broad‐Band Defect‐Induced Charge‐Transfer Emission

Synthesis, characterization, and luminescence studies of rare‐earth‐activated NaMgF₃