Crystal Structure, Characterization, and Luminescence Properties of Mn4+-Doped K3Nb2O4F5

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Luminescent properties of Mn4+ in an oxyfluoride complex with ultra-high thermal stability

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Summary: In this study, a highly thermally stable oxyfluoride phosphor CVOF:Mn4+ was successfully designed and constructed, exhibiting strong emission characteristics and a red-shift effect, making it suitable as a red component for white LEDs.

MATERIALS RESEARCH BULLETIN (2022)

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Article Chemistry, Physical

A novel K3WO2F5?2H2O:Mn4+ phosphor with excellent hydrophobic stability by coating paraffin wax for the application of WLEDs

Xiaoyi Liu et al.

Summary: Novel narrow-band red-emitting K3WO2F5∙2H2O:Mn4+ and its paraffin wax-coated phosphor (K3WO2F5∙2H2O:Mn4+@PW) were synthesized and characterized. The phosphor exhibited desirable optical properties and thermal stability, while the PW-coated phosphor showed superior luminescence properties and hydrophobic stability compared to the uncoated phosphors. The red component, K3WO2F5∙2H2O:Mn4+@PW, was successfully applied in warm white light-emitting diodes with excellent photoelectric parameters and stability.

JOURNAL OF ALLOYS AND COMPOUNDS (2022)

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Article Materials Science, Multidisciplinary

A novel Mn4+-activated fluoride red phosphor Cs30(Nb2O2F9)9(OH)3•H2O:Mn4+ with good waterproof stability for WLEDs

Yingyuan Chen et al.

Summary: In this study, a novel fluoride red phosphor with good water resistance was successfully synthesized and characterized. The phosphor exhibited stable crystal structure, strong PL intensity, and better thermal and waterproof stability compared to commercial phosphors.

JOURNAL OF MATERIALS CHEMISTRY C (2022)

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Article Engineering, Environmental

High moisture resistance of an efficient Mn4+-activated red phosphor Cs2NbOF5:Mn4+ for WLEDs

Jianbang Zhou et al.

Summary: Mn4+-activated oxyfluoroniobate phosphor (Cs2NbOF5) with internal quantum efficiency of approximately 82% has shown remarkably improved waterproof stability even without surface coating compared to commercial fluoride red-emitting phosphor. The presence of Nb5+ ions inside the phosphor plays a crucial role in enhancing the water-resistant performance of Mn4+, offering a new concept for overcoming the waterproof downside in humid conditions while maintaining luminescence efficiency. White LEDs fabricated using Cs2NbOF5:Mn4+ demonstrate high luminous efficacy (174 lm/W) and excellent color rendering properties.

CHEMICAL ENGINEERING JOURNAL (2021)

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Article Chemistry, Physical

A Novel Red-Emitting Na2NbOF5:Mn4+ Phosphor with Ultrahigh Color Purity for Warm White Lighting and Wide-Gamut Backlight Displays

Jingshan Hou et al.

Summary: A novel red-emitting oxyfluoride phosphor Na2NbOF5:Mn4+ with an ultra-intense zero-phonon line (ZPL) was successfully synthesized, showing high color purity and short fluorescence decay time, suitable for white light-emitting diode (WLED) and display backlight applications.

MATERIALS (2021)

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Article Chemistry, Inorganic & Nuclear

Moisture-resistant Nb-based fluoride K2NbF7:Mn4+ and oxyfluoride phosphor K3(NbOF5)(HF2):Mn4+: synthesis, improved luminescence performance and application in warm white LEDs

Ge Pang et al.

Summary: High-efficiency Nb-based oxyfluoride K-3(NbOF5)(HF2):Mn4+ and fluoride K2NbF7:Mn4+ phosphors were successfully synthesized, with K-3(NbOF5)(HF2):Mn4+ demonstrating stronger luminous intensity and better moisture resistance compared to K2NbF7:Mn4+, significantly improving the correlated color temperature (CCT) and color rendering index (CRI) of warm white LEDs. Therefore, K-3(NbOF5)(HF2):Mn4+ phosphor has broader application prospects in the field of warm white LEDs.

DALTON TRANSACTIONS (2021)

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Article Chemistry, Multidisciplinary

Mn4+-activated oxyfluoride K3TaOF6 red phosphor with intense zero phonon line for warm white light-emitting diodes

Jiao Wu et al.

Summary: In this study, a Mn4+-activated K3TaOF6 oxyfluoride red phosphor was synthesized and characterized for its strong absorption and emission properties. Theoretical calculations and temperature-dependent PL and TL spectra revealed the dominant role of thermal ionization in the thermal quenching phenomenon in this phosphor.

RSC ADVANCES (2021)

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Article Engineering, Environmental

A Mn4+-doped oxyfluoride phosphor with remarkable negative thermal quenching and high color stability for warm WLEDs

Shengan He et al.

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K2SnOF4 and K2WO3F2 - different but similar

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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (2019)

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JOURNAL OF FLUORINE CHEMISTRY (2019)

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

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ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES (2015)

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Synthesis of Na2SiF6:Mn4+ red phosphors for white LED applications by co-precipitation

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JOURNAL OF MATERIALS CHEMISTRY C (2014)

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Temperature-dependent photoluminescence properties of deep-red emitting Mn4+-activated magnesium fluorogermanate phosphors

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ACTA CRYSTALLOGRAPHICA SECTION D-STRUCTURAL BIOLOGY (2009)

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Direct synthesis and properties of K2SiF6:Mn4+ phosphor by wet chemical etching of Si wafer

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Mn4+-Activated Red Photoluminescence in K2SiF6 Phosphor

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Crystal Structure, Characterization, and Luminescence Properties of Mn4+-Doped K3Nb2O4F5

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