Perovskite tungstate Ba2La2ZnW2O12:Mn4+ phosphor: Synthesis, energy transfer and tunable emission

Cao, Renping; Zhang, Weijun; Chen, Ting; Zheng, Yunfei; Ao, Hui; Luo, Zhiyang; Xie, Shuai; Wan, Huijun

doi:10.1016/j.materresbull.2020.111200

Cited by 43 publications

(15 citation statements)

References 64 publications

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“…The spectral profiles match well with the features of the Mn 4+ transition. As shown in Figure a, under monitoring of 700 nm, the phosphors show a broad excitation band in the range of 250 to 600 nm with multibands centered at ∼350, 406, and 490 nm, corresponding to the 4 A 2g → 4 T 1g transition of Mn 4+ overlapping with O 2– → Mn 4+ charge transfer band (CTB), 4 A 2g → 2 T 2g , and 4 A 2g → 4 T 2g transitions, respectively. − The short-wavelength side of the first excitation band at the UV region, corresponding to CTB, shows a slight red shift first from x = 0.1 to 0.5, then converts to a blue shift afterward. The characteristic excitations from Mn 4+ show trivial variations.…”

Section: Results and Discussionmentioning

confidence: 99%

Site Preference-Driven Mn⁴⁺ Stabilization in Double Perovskite Phosphor Regulating Quantum Efficiency from Zero to Champion

Wang

Ding

et al. 2022

Inorg. Chem.

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The tetravalent-state stability of manganese is of primary importance for Mn4+ luminescence. Double perovskite-structured A2B′B″O6:Mn4+ has been recently prevalent, and the manganese ions are assumed to substitute for the B″(IV–VI)O6 site to stabilize at the tetravalent charge state to generate far-red emissions. However, some Mn-doped A2B′B″O6-type materials show no or weak luminescence such as typical Ca2MgWO6:Mn. In this work, a cation-pair co-substitution strategy is proposed to replace 2Ca2+ by Na+–La3+ to form Ca2–2x Na x La x MgWO6:Mn. The significant structural distortion appears in the solid solution lattices with the contraction of [MgO6] but enlargement of [WO6] octahedron. We hypothesize that the site occupancy preference of Mn migrates from Mg2+ to W6+ sites. As a result, the effective Mn4+/Mn2+ concentration enhances remarkably to regulate nonluminescence to highly efficient Mn4+-related far-red emission. The optimal CaNa0.5La0.5MgWO6:0.9%Mn4+ shows an internal quantum efficiency of 94% and external quantum efficiency of 82%, reaching up to the top values in Mn4+-doped oxide phosphors. This work may provide a new perspective for the rational design of Mn4+-activated red phosphors, primarily considering the site occupancy modification and tetravalent-state stability of Mn.

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Section: Results and Discussionmentioning

confidence: 99%

Site Preference-Driven Mn⁴⁺ Stabilization in Double Perovskite Phosphor Regulating Quantum Efficiency from Zero to Champion

Wang

Ding

et al. 2022

Inorg. Chem.

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“…To calculate the effects of a crystal field, one can use the crystal field parameter D q along with Racah’s parameters ( B ) and ( C ) , As a consequence, D q , B , and C of SIT:0.003Mn 4+ were evaluated as 1795, 817, and 2827 cm –1 . When D q / B ≥ 2.2, a crystal field is considered strong, so the present crystal field ( D q / B = 2.2) in SIT is strong, which is similar to those of Ba 2 La 2 ZnW 2 O 12 :Mn 4+ ( D q / B = 2.28), La 2 LiSbO 6 :Mn 4+ ( D q / B = 2.32), and Ca 2 LaSbO 6 :Mn 4+ ( D q / B = 2.3) . However, when Mn 4+ was excited, the electrons are excited to the 4 T 1g , 4 T 2g , and 2 T 2g states from the ground state of 2 A g .…”

Section: Resultsmentioning

confidence: 60%

Fluorescence Lifetime-Based Luminescent Thermometry Material with Lifetime Varying over a Factor of 50

Zhao

Zhang

et al. 2022

Inorg. Chem.

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Recently, the growing demand for temperature detection is pushing forward the flourishing development of noncontact optical thermometry. Herein, a new red phosphor Sr 2 InTa 1−x O 6 :xMn 4+ (SIT:xMn 4+ ) was first constructed and systematically investigated. Based on the fairly rapid decline of the lifetime from 0.403 to 0.008 ms by increasing the temperature from 25 to 450 K, a noncontact optical thermometer can be made from phosphor SIT:0.003Mn 4+ with S r = 1.396% K −1 at 375 K and S a = 0.0012 K −1 at 300 K. Because the luminescence is based on the outermost 3d orbits of Mn 4+ , the lifetime of SIT:xMn 4+ is quite sensitive to the temperature, leading to a rapid decline of the lifetime with the increase in temperature. Moreover, multiple rounds of variable-temperature studies were performed to demonstrate the stability and reversibility of SIT:0.003Mn 4+ . This work suggests that Mn 4+phosphors are promising candidates for application as optical thermometric material.

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“…Figure 9(D) shows the luminescence decay of the Mn 4+ ‐doped phosphors under the excitation at 365 nm and monitored at 698 nm at RM. All of the decay curves are accurately fitted by the following equation: 39,40

τ_{m} = \frac{\int_{0}^{\infty} t \times I_{((), t)} d t}{\int_{0}^{\infty} I_{((), t)} d t},

where I(t) is the luminescence intensity, and

τ_{m}

is the average decay times. The average lifetimes of the SISO: x Mn 4+ phosphors are 0.154, 0.143, 0.130, 0.121, 0.114, 0.104, and 0.077 ms corresponding to x = 0.002, 0.003, 0.004, 0.005, 0.006, 0.008, and 0.010 mol, respectively.…”

Section: Resultsmentioning

confidence: 99%

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

et al. 2021

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High‐efficiency and far‐red light phosphors based on Mn4+‐doped inorganic luminescence materials are beneficial to plant cultivation. However, Mn4+‐doped oxide phosphors have a common problem of low quantum efficiency. Alkali metal ion codoping can effectively improve the luminescence properties of Mn4+‐activated oxide phosphors. Herein, a series of Sr2InSbO6:Mn4+, M (SISO:Mn4+, M) (M = Li+, Na+, and K+) far‐red‐emitting phosphors codoped alkali metal ions were first synthesized. Density functional theory calculation indicated that SISO is a kind of indirect bandgap material with a bandgap of ∼1.60 eV. The SISO:Mn4+ samples showed a far‐red light at 698 nm upon 365 nm, which perfectly matched the absorption spectrum of the far‐red‐phytochrome (Pfr) of plants. The doping concentration of the SISO:Mn4+ samples was optimized to be 0.006 mol. The concentration quenching mechanism was defined as dipole–dipole interaction by combining the Dexter theory and the Inokuti–Hirayama model. Optimizing the sintering temperature and codoped with alkali metal ions (Li+, Na+, and K+) could improve the luminescent intensity of SISO:Mn4+. The optimum sintering temperature was 1300°C. The internal quantum efficiencies of SISO:0.006Mn4+ and SISO:0.006Mn4+, 0.006Li+ phosphors are 22.67% and 60.56%, respectively. SISO:Mn4+, Li+ phosphors‐based plant growth light‐emitting diodes (LEDs) demonstrate excellent optical stability and long lifetime. Thus, these phosphors are promising candidates for plant cultivation LEDs.

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Perovskite tungstate Ba2La2ZnW2O12:Mn4+ phosphor: Synthesis, energy transfer and tunable emission

Cited by 43 publications

References 64 publications

Site Preference-Driven Mn⁴⁺ Stabilization in Double Perovskite Phosphor Regulating Quantum Efficiency from Zero to Champion

Site Preference-Driven Mn⁴⁺ Stabilization in Double Perovskite Phosphor Regulating Quantum Efficiency from Zero to Champion

Fluorescence Lifetime-Based Luminescent Thermometry Material with Lifetime Varying over a Factor of 50

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

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Perovskite tungstate Ba2La2ZnW2O12:Mn4+ phosphor: Synthesis, energy transfer and tunable emission

Cited by 43 publications

References 64 publications

Site Preference-Driven Mn4+ Stabilization in Double Perovskite Phosphor Regulating Quantum Efficiency from Zero to Champion

Site Preference-Driven Mn4+ Stabilization in Double Perovskite Phosphor Regulating Quantum Efficiency from Zero to Champion

Fluorescence Lifetime-Based Luminescent Thermometry Material with Lifetime Varying over a Factor of 50

An efficient far‐red emission Sr2InSbO6:Mn4+, M (M = Li+, Na+, and K+) phosphors for plant cultivation LEDs

Contact Info

Product

Resources

About

Site Preference-Driven Mn⁴⁺ Stabilization in Double Perovskite Phosphor Regulating Quantum Efficiency from Zero to Champion

Site Preference-Driven Mn⁴⁺ Stabilization in Double Perovskite Phosphor Regulating Quantum Efficiency from Zero to Champion

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs