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Ethanol-Induced Deposition of a Passivation Layer to Enhance the Water Resistance and Luminescent Properties of K 2 TiF 6 : Mn 4+ Phosphors.

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Title: Ethanol-Induced Deposition of a Passivation Layer to Enhance the Water Resistance and Luminescent Properties of K 2 TiF 6 : Mn 4+ Phosphors.
Authors: Yang, Haoyu1 (AUTHOR), Li, Xinhua2,3 (AUTHOR), Gu, Yongyi2,3 (AUTHOR), Liu, Sifei1,2 (AUTHOR), Liu, Xueyu1,2 (AUTHOR), Tang, Xinrong2,3 (AUTHOR), Xu, Haiyan1,3 (AUTHOR)
Source: Materials (1996-1944). May2026, Vol. 19 Issue 10, p1925. 10p.
Subjects: Surface passivation, Waterproofing, LED lamps, Phosphors, Fluorescence, Fluorescence yield
Abstract: Poor moisture resistance represents a critical bottleneck restricting the practical application of K2TiF6:Mn4+ phosphors in white light-emitting diodes. In this work, phosphorous acid was employed as a reducing agent to eliminate surface Mn4+ species and passivate the phosphor surface, followed by ethanol-induced surface deposition. This approach successfully constructed a thick K2TiF6 matrix coating layer on the phosphor particles. After 6 h of water immersion, the treated phosphors maintained 88.1% of their initial fluorescence intensity; even after boiling treatment, the internal quantum yield still reached as high as 76.8%. WLED devices encapsulated with the modified phosphors exhibited outstanding stability during continuous operation for 432 h under high-temperature and high-humidity conditions. This effective surface modification strategy significantly broadens the application prospects of Mn4+-doped fluoride red phosphors in WLEDs. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Header DbId: egs
DbLabel: Engineering Source
An: 194116761
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Ethanol-Induced Deposition of a Passivation Layer to Enhance the Water Resistance and Luminescent Properties of K 2 TiF 6 : Mn 4+ Phosphors.
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  Data: <searchLink fieldCode="AR" term="%22Yang%2C+Haoyu%22">Yang, Haoyu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Xinhua%22">Li, Xinhua</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gu%2C+Yongyi%22">Gu, Yongyi</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Sifei%22">Liu, Sifei</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Xueyu%22">Liu, Xueyu</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tang%2C+Xinrong%22">Tang, Xinrong</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xu%2C+Haiyan%22">Xu, Haiyan</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. May2026, Vol. 19 Issue 10, p1925. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Surface+passivation%22">Surface passivation</searchLink><br /><searchLink fieldCode="DE" term="%22Waterproofing%22">Waterproofing</searchLink><br /><searchLink fieldCode="DE" term="%22LED+lamps%22">LED lamps</searchLink><br /><searchLink fieldCode="DE" term="%22Phosphors%22">Phosphors</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence%22">Fluorescence</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence+yield%22">Fluorescence yield</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Poor moisture resistance represents a critical bottleneck restricting the practical application of K2TiF6:Mn4+ phosphors in white light-emitting diodes. In this work, phosphorous acid was employed as a reducing agent to eliminate surface Mn4+ species and passivate the phosphor surface, followed by ethanol-induced surface deposition. This approach successfully constructed a thick K2TiF6 matrix coating layer on the phosphor particles. After 6 h of water immersion, the treated phosphors maintained 88.1% of their initial fluorescence intensity; even after boiling treatment, the internal quantum yield still reached as high as 76.8%. WLED devices encapsulated with the modified phosphors exhibited outstanding stability during continuous operation for 432 h under high-temperature and high-humidity conditions. This effective surface modification strategy significantly broadens the application prospects of Mn4+-doped fluoride red phosphors in WLEDs. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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    Identifiers:
      – Type: doi
        Value: 10.3390/ma19101925
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 1925
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      – SubjectFull: Surface passivation
        Type: general
      – SubjectFull: Waterproofing
        Type: general
      – SubjectFull: LED lamps
        Type: general
      – SubjectFull: Phosphors
        Type: general
      – SubjectFull: Fluorescence
        Type: general
      – SubjectFull: Fluorescence yield
        Type: general
    Titles:
      – TitleFull: Ethanol-Induced Deposition of a Passivation Layer to Enhance the Water Resistance and Luminescent Properties of K 2 TiF 6 : Mn 4+ Phosphors.
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          Name:
            NameFull: Yang, Haoyu
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          Name:
            NameFull: Li, Xinhua
      – PersonEntity:
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            NameFull: Gu, Yongyi
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            NameFull: Liu, Sifei
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            NameFull: Liu, Xueyu
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            NameFull: Tang, Xinrong
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            NameFull: Xu, Haiyan
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            – D: 15
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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              Value: 19
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              Value: 10
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            – TitleFull: Materials (1996-1944)
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