Luminescence, energy transfer and optical thermometry of a novel narrow red emitting phosphor: Cs2WO2F4:Mn4+

Cai, Peiqing; Qin, Lin; Chen, Cuili; Wang, Jing; Seo, Hyo Jin

doi:10.1039/c7dt02751f

Cited by 90 publications

(62 citation statements)

References 43 publications

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“…MEG:Mn 4+ phosphor is more suitable for optical thermometry sensors materials. In addition, as seen in Table S3 in the Supporting Information, the as‐prepared MEG:0.01Mn 4+ sample even presents a much higher sensitivity than the previously reported Mn 4+ doped temperature sensing phosphors . This result indicates that as‐prepared MEG:0.01Mn 4+ sample could also be a promising candidate in the application of low‐temperature thermometry sensors.…”

Section: Resultsmentioning

confidence: 68%

Strategies for Designing Antithermal‐Quenching Red Phosphors

et al. 2020

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efficiency,low-energy consumption, long lifetime, and environmental compatibility, and so on. [1][2][3] The common w-LEDs devices are fabricated via two combination strategies: 1) blue LED chip and yellow phosphor; 2) nearultraviolet (n-UV) LED chip and tricolor phosphors. [4,5] No matter for which fabrication methods, the development of red phosphor is crucial to improve the lighting quality and tune corrected color temperature of w-LEDs. [6,7] To date, many researchers have focused on exploring highly efficient red phosphors. Although Eu 2+ -doped nitride phosphors such as CaAlSiN 3 :Eu 2+ and Sr 2 Si 5 N 8 :Eu 2+[8-10] show high quantum yield (QY > 90%) and high thermal quenching temperature (>600 K), the harsh preparation conditions (high pressure ≥ 0.9-2.5 MPa; high temperature ≥1700-200 °C) and deepred emission position (beyond 650 nm) limit the large-scale application in indoor lighting. Eu 3+ -doped inorganic compounds are typical red-emitting phosphors due to the (4f 6 ) 5 D 0 → (4f 6 ) 7 F J spin-and parity-forbidden transition, [11,12] but it is hardly utilized in w-LEDs applications owing to the linearly narrow excitation and emission. [13,14] Mn 4+ has been considered as the promising red-emitting activator Nowadays, red phosphor plays a key role in improving the lighting quality and color rendering index of phosphor-converted white light emitting diodes (w-LEDs). However, the development of thermally stable and highly efficient red phosphor is still a pivotal challenge. Herein, a new strategy to design antithermal-quenching red emission in Eu 3+ , Mn 4+ -codoped phosphors is proposed.

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Section: Resultsmentioning

confidence: 68%

Strategies for Designing Antithermal‐Quenching Red Phosphors

et al. 2020

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“…In addition, the probe can be used for several engineering applications, such as for the preparation of temperature‐sensitive luminescent paints and coatings for aerodynamic testing, for thermal mapping of electronic circuits, and for temperature measurements in microfluidic devices . From the well‐known behavior of lanthanide and transition metal ion activated phosphors one can assume that the probe's operating range can be extended much below RT since Mn 4+ emission gains on intensity with the decrease in temperature; however, with the available experimental equipment this assumption could not be tested in this work. On the other hand, due to strong quenching of Mn 4+ emission the upper temperature operating bound could be extended only slightly by using equipment with large signal‐to‐noise ratio and/or using the probe with larger content of Mn 4+ ‐doped phosphor (to enhance Mn 4+ emission).…”

Section: Resultsmentioning

confidence: 99%

Highly Sensitive Dual Self‐Referencing Temperature Readout from the Mn⁴⁺/Ho³⁺ Binary Luminescence Thermometry Probe

Sekulić

Đorđević

Ristić

et al. 2018

Advanced Optical Materials

122

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of luminescence signal in comparison to other methods, relatively fast response, and a good spatial resolution. Temperature can be determined from different features of luminescence, such as excitation and emission band positions and bandwidths, emission band intensities, luminescence intensity ratio (LIR; the ratio of intensities of two emission bands), anisotropy, emission decay-or rise-times, etc. [2] Temperature readouts from LIR and emission lifetime are by far the most exploited luminescence thermometry methods. Both readouts are self-referencing and are not affected by fluctuations in the excitation and signal detection. Luminescence of any substance is strongly affected by temperature, and, thus, variety of materials may be utilized as a luminescence thermometry probe. The choice is commonly made on quantum dots, organic dyes, metal-organic complexes and frameworks, and lanthanide or transition metal ion based phosphors, the last of which are the most exploited ones. When screening materials for the suitable luminescence thermometry probe for the specific application, attention is given to material's structural, chemical, luminescent, and thermographic properties. Most of all, luminescence of material should notably change with temperature to provide sensitive measurement with adequate temperature resolution. Also, a probe should provide repeatable and reproducible temperature determination. Furthermore, for the practical realization of thermometer, some other materials properties are of interest, such as excitation and emission wavelengths and bandwidths, which should facilitate production of cost-effective and simple measurement devices.Regarding structural and chemical properties, lanthanide and transition metal ion based materials and material's systems meet most of above mentioned conditions. They are thermally and chemically stable, provide sufficient brightness, and exceptional photostability. They also facilitate thermometry with excellent repeatability and reproducibility. However, they generally lack sensitivity and, consequently, temperature resolution. LIR readout scheme with trivalent lanthanide ion activated phosphors exploits emissions from two closely separated and thermally coupled excited states (either in the upconversion or downshifting processes). [3] In such case, the relative sensitivity is limited by the energy difference between these excitedThe binary luminescence thermometry probe is prepared from Y 2 O 3 :Ho 3+ and Mg 2 TiO 4 :Mn 4+ powders. This probe facilitates self-referencing temperature readouts with excellent repeatability from both emission intensity ratio and excited state lifetimes. The ratio of intensities of Mn 4+ deep red emission from 2 E, 4 T 2 → 4 A 2 electronic transitions, and Ho 3+ green emission from 5 F 4 , 5 S 2 → 5 I 8 electronic transitions provides temperature measurements over the room temperature to 100 °C temperature range with a superior relative sensitivity of 4.6% °C −1 and temperature resolution of 0.1 °C. Over the same temperature range, the tem...

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“…By examining the emission spectrum, it becomes evident that Mo 6+ seems to exhibit a coordination sphere consisting solely of fluorine atoms, as it is blue‐shifted in comparison to known fluoride phosphors, like K 2 SiF 6 :Mn 4+ . The coordination of solely fluoride around Mn 4+ is also postulated for other oxyfluoride materials like Cs 2 WO 2 F 4 or Na 2 WO 2 F 4 , . Therefore, it is reasonable to assume that an octahedral coordinated [MoOF 5 ] – unit is substituted for an [MnF 6 ] 2– unit.…”

Section: Resultsmentioning

confidence: 99%

“…Hexafluoridosilicates were and are still investigated extensively . Recently, Seo and co‐workers started to study not only hexafluoridosilicates but also oxyfluorides like Cs 2 WO 2 F 4 as a host material for the doping with Mn 4+ . Since then, several new oxyfluoride phosphors (BaNbOF 5 :Mn 4+ , Cs 2 NbOF 5 :Mn 4+ , Na 2 WO 2 F 4 :Mn 4+ , Rb 2 NbOF 5 :Mn 4+ , BaTiOF 4 :Mn 4+ , Rb 5 Nb 3 OF 18 :Mn 4+ , K 3 TaO 2 F 4 :Mn 4+ , K 3 HF 2 WO 2 F 4 :Mn 4+ ) were discovered .…”

Section: Introductionmentioning

confidence: 99%

HF‐Free Solid‐State Synthesis of the Oxyfluoride Phosphor K₃MoOF₇:Mn⁴⁺

et al. 2019

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K 3 MoOF 7 :Mn 4+ was synthesized through a facile twostep solid-state synthesis route without using HF. The first step was carried out in copper ampules, which were shut by welding, followed by the second step, a ball milling experiment. The sample was characterized by single-crystal and powder X-ray diffraction, EDX, and luminescence spectroscopy. K 3 MoOF 7 crystallizes in the triclinic space group P1 (no. 2). It features [a]

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Luminescence, energy transfer and optical thermometry of a novel narrow red emitting phosphor: Cs₂WO₂F₄:Mn⁴⁺

Cited by 90 publications

References 43 publications

Strategies for Designing Antithermal‐Quenching Red Phosphors

Strategies for Designing Antithermal‐Quenching Red Phosphors

Highly Sensitive Dual Self‐Referencing Temperature Readout from the Mn⁴⁺/Ho³⁺ Binary Luminescence Thermometry Probe

HF‐Free Solid‐State Synthesis of the Oxyfluoride Phosphor K₃MoOF₇:Mn⁴⁺

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Luminescence, energy transfer and optical thermometry of a novel narrow red emitting phosphor: Cs2WO2F4:Mn4+

Cited by 90 publications

References 43 publications

Strategies for Designing Antithermal‐Quenching Red Phosphors

Strategies for Designing Antithermal‐Quenching Red Phosphors

Highly Sensitive Dual Self‐Referencing Temperature Readout from the Mn4+/Ho3+ Binary Luminescence Thermometry Probe

HF‐Free Solid‐State Synthesis of the Oxyfluoride Phosphor K3MoOF7:Mn4+

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Luminescence, energy transfer and optical thermometry of a novel narrow red emitting phosphor: Cs₂WO₂F₄:Mn⁴⁺

Highly Sensitive Dual Self‐Referencing Temperature Readout from the Mn⁴⁺/Ho³⁺ Binary Luminescence Thermometry Probe

HF‐Free Solid‐State Synthesis of the Oxyfluoride Phosphor K₃MoOF₇:Mn⁴⁺