Spectroscopic properties of Mn4+ ions in SrLaAlO4

Zhydachevskii, Ya.; Suchocki, A.; Pajączkowska, A.; Kłos, A.; Szysiak, A.; Reszka, A.

doi:10.1016/j.optmat.2013.04.028

Cited by 20 publications

(14 citation statements)

References 11 publications

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“…Mn 4+ -doped oxides have lower O 2− → Mn 4+ CT transition energies of 30,000–35,000 cm −1 and are therefore expected to have lower T ½ values than fluorides if quenching occurs by the mechanism in Fig. 4a 26,27,53,54 . Some Mn 4+ -doped oxides, however, have much higher quenching temperatures than Mn 4+ -doped fluorides.…”

Section: Resultsmentioning

confidence: 99%

Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

2018

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Red-emitting Mn4+-doped fluorides are a promising class of materials to improve the color rendering and luminous efficacy of white light-emitting diodes (w-LEDs). For w-LEDs, the luminescence quenching temperature is very important, but surprisingly no systematic research has been conducted to understand the mechanism for thermal quenching in Mn4+-doped fluorides. Furthermore, concentration quenching of the Mn4+ luminescence can be an issue but detailed investigations are lacking. In this work, we study thermal quenching and concentration quenching in Mn4+-doped fluorides by measuring luminescence spectra and decay curves of K2TiF6:Mn4+ between 4 and 600 K and for Mn4+ concentrations from 0.01% to 15.7%. Temperature-dependent measurements on K2TiF6:Mn4+ and other Mn4+-doped phosphors show that quenching occurs through thermally activated crossover between the 4T2 excited state and 4A2 ground state. The quenching temperature can be optimized by designing host lattices in which Mn4+ has a high 4T2 state energy. Concentration-dependent studies reveal that concentration quenching effects are limited in K2TiF6:Mn4+ up to 5% Mn4+. This is important, as high Mn4+ concentrations are required for sufficient absorption of blue LED light in the parity-forbidden Mn4+ d–d transitions. At even higher Mn4+ concentrations (>10%), the quantum efficiency decreases, mostly due to direct energy transfer to quenching sites (defects and impurity ions). Optimization of the synthesis to reduce quenchers is crucial for developing more efficient highly absorbing Mn4+ phosphors. The present systematic study provides detailed insights into temperature and concentration quenching of Mn4+ emission and can be used to realize superior narrow-band red Mn4+ phosphors for w-LEDs.

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Section: Resultsmentioning

confidence: 99%

Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

2018

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“…[ 12–27 ] LaSrGaO 4 (LSG), as a typical of perovskite‐like matrix, is selected here to be the host for Er 3+ . The characteristics and causes of luminescence of the host LSG have been described in detail in previous work [ 28–32 ] and are only briefly described here. The matrix LSG emits 722 nm deep red light at 354 nm and 527 nm excitation, and the crystal structure analysis of LSG reveals narrow band width and the structure is of a perovskite structure, prone to characteristic point defects and prone to self‐luminescence.…”

Section: Introductionmentioning

confidence: 99%

Down‐conversion luminescence and temperature sensing characteristics of LaSrGaO₄:Er³⁺

Liu

et al. 2021

Luminescence

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Erbium(III) ion (Er3+) has abundant energy levels that can emit light covering a quite broad wavelength range in many hosts. Here we synthesized LaSrGaO4:Er3+ phosphors by a high‐temperature solid‐state method. Upon excitation at the ultraviolet (UV) band, LaSrGaO4:Er3+ phosphors could emit green, red and near‐infrared emission simultaneously. The temperature dependent emission characteristics of the as‐prepared samples was then studied and two kinds of luminescent ratiometric thermometry were constructed. The first one is on the basis of two green emission bands that stems from the 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions of Er3+. The intensity ratio between these two emission bands was found to follow well with the Boltzmann distribution, and its maximum relative sensitivity was calculated to be 0.84% K−1 at 299 K. The other one depends on the 4F9/2 → 4I15/2 transition of Er3+ and self‐luminescence of the host LaSrGaO4, considering that these two emission lines have different temperature response. The relative sensitivity of this type of luminescence intensity ratio (LIR) thermometry could reach 1.86% K−1 at 299 K, we have successfully developed materials with one of the largest relative sensitivities to date, which provides some basis for the subsequent development of a new type of non‐contact temperature sensor.

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“…In recent years, many researchers investigated the Mn 4+ activated oxide-based phosphors due to their chemical stability and eco-friendly synthesis process. [33][34][35][36][37][38][39][40][41][42][43][44][45][46] In this work, we reported on novel deep red emitting Mn 4+activated SrLaAlO 4 phosphors prepared by using conventional high-temperature solid-state reaction method. The crystal structure, morphology, and luminescence properties of SrLaAlO 4 :-Mn 4+ phosphors were investigated in detail.…”

Section: Introductionmentioning

confidence: 99%

Novel SrLaAlO₄:Mn⁴⁺deep-red emitting phosphors with excellent responsiveness to phytochrome P_FRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

et al. 2018

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Herein, novel rare-earth-free Mn 4+ -doped SrLaAlO 4 deep-red emitting phosphors were successfully synthesized via a traditional solid-state reaction method. The crystal structure and phase purity of the asprepared samples were confirmed by XRD Rietveld refinement. Photoluminescence properties of SrLaAlO 4 :Mn 4+ phosphors were examined in detail using photoluminescence spectra, decay lifetimes, temperature-dependent emission spectra and internal quantum efficiency measurements. The excitation spectrum obtained by monitoring at 730 nm contained two excitation bands centered at 364 and 520 nm within the range of 200-550 nm due to the Mn 4+ -O 2À charge-transfer band and the 4 A 2g / 4 T 1g , 4 T 2g transitions of the Mn 4+ ions. Under the 364 nm excitation, the SrLaAlO 4 :Mn 4+ phosphors exhibited an intense deep-red emission band in 610-790 nm wavelength range peaking at 730 nm,which was assigned to the 2 E g / 4 A 2g transition of Mn 4+ ions. The deep red emission showed excellent responsiveness to phytochrome P FR , revealing that the SrLaAlO 4 :0.4% Mn 4+ phosphors possessed a possible application in deep-red light-emitting diodes (LEDs) for plant cultivation. The optimal doping concentration of Mn 4+ ions was found to be 0.4 mol%. The critical distance R c for energy transfer among Mn 4+ ions was determined to be 5.86Å and the concentration quenching mechanism was confirmed to be the electric dipole-dipole interaction. In addition, the Commission International de I'Eclairage (CIE) colour coordinates of the SrLaAlO 4 :0.4% Mn 4+ phosphors (0.734, 0.266) were located in the deep red region and the corresponding internal quantum efficiency was measured to be about 29%.The above results confirmed that the as-prepared SrLaAlO 4 :0.4% Mn 4+ deep red emitting phosphors might be a potential candidate for plant cultivation LEDs.

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Spectroscopic properties of Mn4+ ions in SrLaAlO4

Cited by 20 publications

References 11 publications

Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

Down‐conversion luminescence and temperature sensing characteristics of LaSrGaO₄:Er³⁺

Novel SrLaAlO₄:Mn⁴⁺deep-red emitting phosphors with excellent responsiveness to phytochrome P_FRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

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Spectroscopic properties of Mn4+ ions in SrLaAlO4

Cited by 20 publications

References 11 publications

Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

Down‐conversion luminescence and temperature sensing characteristics of LaSrGaO4:Er3+

Novel SrLaAlO4:Mn4+deep-red emitting phosphors with excellent responsiveness to phytochrome PFRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability

Contact Info

Product

Resources

About

Down‐conversion luminescence and temperature sensing characteristics of LaSrGaO₄:Er³⁺

Novel SrLaAlO₄:Mn⁴⁺deep-red emitting phosphors with excellent responsiveness to phytochrome P_FRfor plant cultivation LEDs: synthesis, photoluminescence properties, and thermal stability