Multi-site occupancies and photoluminescence characteristics in developed Eu2+-activated Ba5SiO4Cl6 bifunctional platform: Towards manufacturable optical thermometer and indoor illumination

Du, Peng; Luo, Laihui; Li, Weiping; Yan, Feng; Xing, Guozhong

doi:10.1016/j.jallcom.2020.154233

Cited by 26 publications

(6 citation statements)

References 58 publications

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“…Therefore, the kinetic process of the 2 E g → 4 A 2g emission was complicated in the whole measured temperature range, and it is difficult to establish a simple non-radiative transition theoretical model to describe the temperature-dependent decay behavior of Mn 4+ doped phosphors. In this case, the average lifetime was adopted to evaluate the values, which can be calculated by the equation [ 43 ]:

where I(t) is the intensity at time t , A 1 and A 2 represent the pre-exponential factors, τ 1 and τ 2 stand for the fast decay lifetime and slow decay lifetime, respectively, and τ ave is the average lifetime. The calculated lifetime values at various temperatures are listed in Figure 9 b.…”

Section: Resultsmentioning

confidence: 99%

Luminescence of Mn4+ in a Zero-Dimensional Organic–Inorganic Hybrid Phosphor [N(CH3)4]2ZrF6 for Dual-Mode Temperature Sensing

Wang

Lü

et al. 2022

Materials

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Searching for new low-dimensional organic–inorganic hybrid phosphors is of great significance due to their unique optical properties and wide applications in the optoelectronic field. In this work, we report a Mn4+ doped zero-dimensional organic–inorganic hybrid phosphor [N(CH3)4]2ZrF6, which was synthesized by a wet chemical method. The crystal structure, thermal stability, and optical properties were systemically investigated by means of XRD, SEM, TG-DTA, FTIR, DRS, emission spectra, excitation spectra, as well as decay curves. Narrow red emission with high color purity can be observed from [N(CH3)4]2ZrF6:Mn4+ phosphor, which maintains effective emission intensity even at room temperature, indicating its potential practical application in WLEDs. In the temperature range of 13–295 K, anti-Stokes and Stokes sidebands of Mn4+ ions exhibit different temperature responses. By applying the emission intensity ratio of anti-Stokes vs. Stokes sidebands as temperature readout, an optical thermometer with a maximum absolute sensitivity of 2.13% K−1 and relative sensitivity of 2.47% K−1 can be obtained. Meanwhile, the lifetime Mn4+ ions can also be used for temperature sensing with a maximum relative sensitivity of 0.41% K−1, demonstrating its potential application in optical thermometry.

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Section: Resultsmentioning

confidence: 99%

Luminescence of Mn4+ in a Zero-Dimensional Organic–Inorganic Hybrid Phosphor [N(CH3)4]2ZrF6 for Dual-Mode Temperature Sensing

Wang

Lü

et al. 2022

Materials

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“…4b,c, respectively. As is known to all, the thermal quenching effect can be realized by three diverse pathways of energy transfer from the luminescent states, cascade multiphonon relaxation and crossover process at high temperature 36,37 . Notably, these three different channels are able to be discriminated by utilizing the temperature-dependent lifetime.…”

Section: Resultsmentioning

confidence: 99%

Facile modulation the sensitivity of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors through adjusting spatial mode and doping concentration

Zhou

2020

Sci Rep

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Series of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors were prepared by solid-state reaction technique. All the samples emitted the unique emissions of Eu2+ and Eu3+ ions when excited by 395 nm, while the strongest emission intensity was received when x = 0.03. On the basis of theoretical discussion, it is evident that crossover relaxation should be responsible for the thermal quenching mechanism which was further proved by the unchanged lifetime at elevated temperature. Besides, through analyzing the inconsistent responses of the emission intensities of the Eu2+ and Eu3+ ions to the temperature, the optical thermometric properties of the designed phosphors were studied. By selecting different emissions of Eu3+ ions and combining with that of the Eu2+ ions, adjustable sensitivities were realized in the resultant phosphors. Furthermore, the sensitivities of the studied compound were also found to be greatly affected by the doping concentration. The maximum absolute and relative sensitivities of the synthesized compounds were 0.0025 K−1 and 0.289% K−1, respectively. These achieved results implied that the Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors were promising candidates for optical thermometry. Additionally, this work also provided promising methods to modulate the sensitivities of the luminescent compounds by adjusting spatial mode and doping concentration.

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“…Based on the temperature measurement related to the fluorescence intensity ratios (FIR), temperature-dependent absolute sensitivity (S a ) and relative sensitivity (S r ) can represent the optical thermometric property of the phosphors [ 35 , 98 ]. The measurement methods and calculation formula will not be repeated here, as they can easily be found in several papers [ 104 ]. The temperature-dependent sensitivity can exhibit the applicable temperature range and potential.…”

Section: Regulation Of Multi-site Luminescencementioning

confidence: 99%

Recent Advances in Multi-Site Luminescent Materials: Design, Identification and Regulation

2023

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The development of novel phosphor materials with excellent performance and modification of their photoluminescence to meet the higher requirements for applications are the essential research subjects for luminescent materials. Multi-site luminescent materials with crystallographic sites for the activator ions that broaden the tunable range of luminescent spectra and even enhance the luminescent performance have attracted significant attention in the pursuit of high-quality luminescence for white light-emitting diodes. Here, we summarize multi-site luminescence characteristics based on the different kinds of host and activator ions, introduce the identifications of multi-site activator ions via optical analysis, provide a structural analysis and theoretical calculation methods, and introduce the regulation strategies and advance applications of multi-site phosphors. The review reveals the relationship between crystal structure and luminescent properties and discusses future opportunities for multi-site phosphors. This will provide guidance for the design and development of luminescent materials or other materials science.

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Multi-site occupancies and photoluminescence characteristics in developed Eu2+-activated Ba5SiO4Cl6 bifunctional platform: Towards manufacturable optical thermometer and indoor illumination

Cited by 26 publications

References 58 publications

Luminescence of Mn4+ in a Zero-Dimensional Organic–Inorganic Hybrid Phosphor [N(CH3)4]2ZrF6 for Dual-Mode Temperature Sensing

Luminescence of Mn4+ in a Zero-Dimensional Organic–Inorganic Hybrid Phosphor [N(CH3)4]2ZrF6 for Dual-Mode Temperature Sensing

Facile modulation the sensitivity of Eu2+/Eu3+-coactivated Li2CaSiO4 phosphors through adjusting spatial mode and doping concentration

Recent Advances in Multi-Site Luminescent Materials: Design, Identification and Regulation

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