Solid state reaction preparation of an efficient rare-earth free deep-red Ca2YNbO6:Mn4+ phosphor

Cao, Ziye; Dong, Shengjuan; Shi, Shikao; Wang, Jiye; Fu, Lianshe

doi:10.1016/j.jssc.2021.122840

Cited by 31 publications

(11 citation statements)

References 45 publications

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“…Furthermore, SIT:0.003Mn 4+ ′s internal (IQE) and external quantum efficiencies (EQE) at room temperature were 11 and 8%, respectively (Figure d). When compared with other Mn 4+ -phosphors, such as Mg 2 La 2 SnO 7 :Mn 4+ (IQE = 28.55%), Ca 2 YNbO 6 :Mn 4+ (IQE = 23.1%), and Ca 2 InSbO 6 :Mn 4+ ,Li + (IQE = 9.69%), this value is relatively low …”

Section: Resultsmentioning

confidence: 88%

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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Section: Resultsmentioning

confidence: 88%

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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“…From the published literature, it can be concluded that Ca 2 YNbO 6 shows a direct band gap. [24] We let phosphor emitted at 612 nm at room temperature. The CTB is located at 250-350 nm, and the 4f-4f transition of Eu 3+ ions produces multiple absorption peaks between 350 nm and 500 nm, which are produced by the 4f-4f transition of Eu 3+ ions.…”

Section: Absorption Spectramentioning

confidence: 99%

A novel red phosphor Ca₂YNbO₆:Eu³⁺ for WLEDs

et al. 2022

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Due to the advantages of good physicochemical properties, thermal stability, and optical properties, double perovskite compounds have received extensive attention. On this basis, a new type of red phosphor, Ca2YNbO6:xEu3+, was synthesized using a high‐temperature solid‐phase method. Its phase purity, morphology, elemental composition, absorption spectrum, photoluminescence, thermal stability, and Commission Internationale de l'éclairage (CIE) chromaticity coordinates were thoroughly investigated. The results display that there is no impurity phase in the samples and the convergence factor Rwp = 14.2%; the microscopic particles are uniform and full, and the distribution of each element is uniform. The energy band gap ΔE is between 3.71 eV and 3.65 eV. The luminescence intensity is the best when the doped Eu3+ concentration x reaches 0.4, and emits 612 nm red light (5D0→7F2) under 465 nm excitation, and the concentration quenching is attributed to a d–d interaction. The luminescence intensity at 425 K was still 75% of the room temperature luminescence intensity, which indicates that the thermal stability is extremely superior. The CIE chromaticity coordinates (0.6534, 0.3455) of the Ca2YNbO6:0.4Eu3+ phosphors are very close to National Television Standards Committee (0.670, 0.330), and the samples have low correlated colour temperature (2656 K) and high colour purity (99.90%). All findings suggest that Ca2YNbO6:Eu3+ can serve as a substitute for red phosphor in WLEDs.

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“…In the existing research on multifunctional phosphors, rare-earth luminescent centers (such as Eu 2+ and Ce 3+ ) with characteristic f - d transitions have received significant attention, as their d orbitals are easily influenced by the crystal field, enabling flexible adjustment to different applications. Examples include multifunctional phosphors Ca 9 NaZn(PO 4 ) 7 :Eu 2+ , Mg 2 Al 4 Si 5 O 18 :Eu 2+ , Gd 3 Al 4 GaO 12 :Ce 3+ , etc. − However, the use of such rare earths as luminescent centers in phosphors often requires preparation in a reducing atmosphere, which involves a complex process, coupled with the high cost of rare earths, resulting in a higher cost of the final product. , Additionally, the nanosecond-level lifetime associated with f-d transitions for thermometry requires precise detection equipment and advanced techniques, which could pose challenges in practical applications. , Moreover, despite the fact that f-d transition centers can achieve high sensitivity in pressure sensing, their reliability is often compromised by the broad emission features of f-d transitions in practical measurements …”

Section: Introductionmentioning

confidence: 99%

“…7−9 However, the use of such rare earths as luminescent centers in phosphors often requires preparation in a reducing atmosphere, which involves a complex process, coupled with the high cost of rare earths, resulting in a higher cost of the final product. 10,11 Additionally, the nanosecond-level lifetime associated with f-d transitions for thermometry requires precise detection equipment and advanced techniques, which could pose challenges in practical applications. 12,13 Moreover, despite the fact that f-d transition centers can achieve high sensitivity in pressure sensing, their reliability is often compromised by the broad emission features of f-d transitions in practical measurements.…”

Section: Introductionmentioning

confidence: 99%

Mn⁴⁺-Activated Double-Perovskite-Type Sr₂LuNbO₆ Multifunctional Phosphor for Optical Probing and Lighting

Chen

Zhu

et al. 2023

ACS Appl. Mater. Interfaces

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Multifunctional phosphors have significant application and scientific value and are becoming a research hotspot in the field of luminescent materials. Herein, we report Mn 4+ -activated double-perovskite-type Sr 2 LuNbO 6 multifunctional phosphors with excellent comprehensive properties in the fields of optical temperature/pressure sensing and w-LED lighting. The crystalline structure, elemental composition, optimal doping concentration, crystal-field strength, and optical bandgap of the phosphors are investigated in detail, and the mechanisms of concentration and thermal quenching are discussed. From the optimal Sr 2 LuNb 0.998 O 6 :0.2%Mn 4+ phosphor, a LED lamp for indoor warm-white lighting is successfully fabricated. Further, the thermometric properties of the phosphors are explored for applications as FIR-and lifetime-based thermometers, showing a maximum relative sensitivity of 1.55% K −1 at 519 K. Upon pressure loading, a significant red-shift of the peak centroid is observed, and the pressure sensitivity is determined to be 0.82 nm/ GPa. These results suggest that the Mn 4+ -activated Sr 2 LuNbO 6 multifunctional phosphors have great potential to be utilized in the fields of optical thermometry, manometry, and lighting.

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Solid state reaction preparation of an efficient rare-earth free deep-red Ca2YNbO6:Mn4+ phosphor

Cited by 31 publications

References 45 publications

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

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

A novel red phosphor Ca₂YNbO₆:Eu³⁺ for WLEDs

Mn⁴⁺-Activated Double-Perovskite-Type Sr₂LuNbO₆ Multifunctional Phosphor for Optical Probing and Lighting

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Solid state reaction preparation of an efficient rare-earth free deep-red Ca2YNbO6:Mn4+ phosphor

Cited by 31 publications

References 45 publications

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

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

A novel red phosphor Ca2YNbO6:Eu3+ for WLEDs

Mn4+-Activated Double-Perovskite-Type Sr2LuNbO6 Multifunctional Phosphor for Optical Probing and Lighting

Contact Info

Product

Resources

About

A novel red phosphor Ca₂YNbO₆:Eu³⁺ for WLEDs

Mn⁴⁺-Activated Double-Perovskite-Type Sr₂LuNbO₆ Multifunctional Phosphor for Optical Probing and Lighting