Size effect in luminescent properties of LiNdP4O12 nanocrystals

Marciniak, Ł.; Stefański, M.; Tomala, Robert; Hreniak, D.; Stręk, W.

doi:10.1016/j.optmat.2014.09.023

Cited by 15 publications

(12 citation statements)

References 21 publications

(29 reference statements)

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“…5). The increase in decay lifetime with grain size has also been found for other systems (e.g., in the study of LiNdP 4 O 12 25 and references therein) and various explanations have been put forward. It is also documented that an increase in particle size and crystallite size (up to a saturation limit of ~500 nm)…”

Section: The Role Mgmentioning

confidence: 63%

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn⁴⁺ Red Luminescence in Sr₄Al₁₄O₂₅: Mn⁴⁺ for Warm WLEDs

et al. 2015

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Red phosphors play an indispensable role in phosphor-based warm white light emitting diodes (WLEDs). We demonstrated recently that the non-rare-earth phosphor Sr 4 Al 14 O 25 :Mn 4+ exhibits red luminescence even more intensely than the commercial Mn 4+ phosphor 3.5MgO.0.5MgF 2 .GeO 2 :Mn 4+ upon blue excitation. Herein, on the basis of crystal field calculations employing the exchange charge model, we identify the energy levels of three types of Mn 4+ ions situated at Al 3+ sites in the Sr 4 Al 14 O 25 crystal lattice and find that the doped manganese ions occupy preferentially the Al4 and Al5 more highly covalent sites rather than the Al6 site. We report that the Mn 4+ luminescence can be enhanced upon the inclusion of Mg 2+ in the synthesis reaction.The mechanisms for this effect comprise the lower nonradiative decay rate from the 2 E g state due to the reduction in energy migration along Mn 4+ ions to killer sites and also the morphology evolution from orderly layered smooth nanosheets to irregular nanoparticles disorderly compacted in porous bundles. Interestingly, various other phases are formed upon the addition of Mg 2+ . The resistance of Mn 4+ photoluminescence in the phosphor to thermal impact has also been studied and no obvious thermal degradation after a cycle experiment by heating and cooling the sample between 25 o C and 300 o C was found. As proof of concept, a warm perception WLED has been made when the phosphor was applied to the package of a blue LED chip and YAG:Ce.

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Section: The Role Mgmentioning

confidence: 63%

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn⁴⁺ Red Luminescence in Sr₄Al₁₄O₂₅: Mn⁴⁺ for Warm WLEDs

et al. 2015

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“…We have recently reported Stokes and anti-Stokes properties of nanocrystalline LiNdP 4 O 12 [19][20][21][22][23] , with emphasis on the influence of Nd 3+ concentration 17 and grain size of the crystals 22 on their luminescent…”

mentioning

confidence: 99%

Synthesis and Nd³⁺ Luminescence Properties of ALa_1–xNd_xP₄O₁₂ (A = Li, Na, K, Rb) Tetraphosphate Nanocrystals

et al. 2015

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The nanocrystalline alkali tetraphosphates doped with Nd 3+ ions were synthesized using co-precipitation method. The structural and spectroscopic properties of ALa 1-x Nd x P 4 O 12 (A=Li, Na, K, Rb) nanocrystals were shown. The impact of the dopant concentration on the emission spectra and the kinetics of the 4 F 3/2 excited state was analyzed. The exponential decay profile for each of the Nd 3+ concentrations was discussed in terms of fast energy diffusion with reduced cross-relaxation processes. The comparison of luminescent properties for different alkali cations was presented.

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“…However, the optical properties of the corresponding nanocrystals and the influence of the size effect on their luminescent properties are not yet well understood. As was already shown, the shape of the emission spectra as well as the luminescent decay times are strongly affected by the size of the nanocrystals [26]. Moreover, the concentration of the optically active ions can significantly influence their spectroscopic properties [27][28][29][30].…”

Section: Introductionmentioning

confidence: 86%

The impact of Eu 3+ concentration on charge transfer and f–f transitions in KLa 1−x Eu x P 4 O 12 nanocrystals

Marciniak

Guyot

Hreniak

et al. 2016

Journal of Luminescence

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Size effect in luminescent properties of LiNdP4O12 nanocrystals

Cited by 15 publications

References 21 publications

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn⁴⁺ Red Luminescence in Sr₄Al₁₄O₂₅: Mn⁴⁺ for Warm WLEDs

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn⁴⁺ Red Luminescence in Sr₄Al₁₄O₂₅: Mn⁴⁺ for Warm WLEDs

Synthesis and Nd³⁺ Luminescence Properties of ALa_1–xNd_xP₄O₁₂ (A = Li, Na, K, Rb) Tetraphosphate Nanocrystals

The impact of Eu 3+ concentration on charge transfer and f–f transitions in KLa 1−x Eu x P 4 O 12 nanocrystals

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Size effect in luminescent properties of LiNdP4O12 nanocrystals

Cited by 15 publications

References 21 publications

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn4+ Red Luminescence in Sr4Al14O25: Mn4+ for Warm WLEDs

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn4+ Red Luminescence in Sr4Al14O25: Mn4+ for Warm WLEDs

Synthesis and Nd3+ Luminescence Properties of ALa1–xNdxP4O12 (A = Li, Na, K, Rb) Tetraphosphate Nanocrystals

The impact of Eu 3+ concentration on charge transfer and f–f transitions in KLa 1−x Eu x P 4 O 12 nanocrystals

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Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn⁴⁺ Red Luminescence in Sr₄Al₁₄O₂₅: Mn⁴⁺ for Warm WLEDs

Site Occupancy Preference, Enhancement Mechanism, and Thermal Resistance of Mn⁴⁺ Red Luminescence in Sr₄Al₁₄O₂₅: Mn⁴⁺ for Warm WLEDs

Synthesis and Nd³⁺ Luminescence Properties of ALa_1–xNd_xP₄O₁₂ (A = Li, Na, K, Rb) Tetraphosphate Nanocrystals