Moisture-resistant and highly efficient narrow-band red-emitting fluoride phosphor K2NaGaF6:Mn4+ for warm white LED application - Details

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Abstract：

Mn4+-Doped　fluoride　red　phosphors　with　excellent　moisture-resistant　properties　and　high　emission　efficiency　are　highly　desired　for　warm　white　LEDs　and　wide　gamut　liquid　crystal　displays.　Herein,　we　synthesized　a　K2NaGaF6:Mn4+　red　phosphor　through　a　co-precipitation　method　at　room　temperature.　The　crystallographic　structure　of　the　K2NaGaF6　host　was　determined　based　on　single　crystal　X-ray　diffraction　data　for　the　first　time.　A　high　internal　photoluminescence　quantum　yield　of　82%　was　achieved　for　the　1.81　at%　K2NaGaF6:Mn4+　sample.　Through　low-temperature　and　high-resolution　spectroscopic　analysis,　we　revealed　that　Mn4+　ions　occupy　at　least　four　distinct　sites　in　the　K2NaGaF6　crystal.　One　of　them　is　assigned　to　the　Ga3+　site　with　high　Oh　site　symmetry　and　the　other　three　ones　possess　low　non-centrosymmetric　site　symmetries.　By　employing　5.51　at%　K2NaGaF6:Mn4+　as　a　red　phosphor,　a　warm　white　LED　with　a　low　correlated　color　temperature　of　3760　K,　a　high　color　rendering　index　of　92　(Ra)　and　a　luminous　efficacy　of　156　lm　W-1　was　packaged.　Aging　tests　at　85　°C　and　85%　relative　humidity　on　the　fabricated　LEDs　demonstrated　that　K2NaGaF6:Mn4+　has　a　better　moisture-resistant　property　than　that　of　the　popular　K2SiF6:Mn4+　phosphor.　These　findings　demonstrate　the　great　potential　of　K2NaGaF6:Mn4+　as　a　highly　efficient　red　phosphor　with　excellent　moisture-resistant　performance.　©　2019　The　Royal　Society　of　Chemistry.

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[ 1 ] [Gao, J.]College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 2 ] [Gao, J.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 3 ] [Zhu, H.]College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 4 ] [Zhu, H.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 5 ] [Zhu, H.]Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen, Fujian, 361021, China
[ 6 ] [Li, R.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 7 ] [Huang, D.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 8 ] [Luo, B.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 9 ] [You, W.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 10 ] [Ke, J.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 11 ] [Yi, X.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 12 ] [Shang, X.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 13 ] [Xu, J.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 14 ] [Deng, Z.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 15 ] [Xu, L.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 16 ] [Guo, W.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China
[ 17 ] [Chen, X.]College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350108, China
[ 18 ] [Chen, X.]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China

Reprint 's Address：

[Zhu, H.]College of Chemistry, Fuzhou UniversityChina

Email：

zhm@fjirsm.ac.cn

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Journal of Materials Chemistry C

ISSN： 2050-7534

Year： 2019

Issue： 26

Volume： 7

Page： 7906-7914

7 . 0 5 9

JCR@2019

5 . 7 0 0

JCR@2023

ESI HC Threshold：236

JCR Journal Grade：1

CAS Journal Grade：2

Cited Count：

WoS CC Cited Count：

SCOPUS Cited Count： 46

ESI Highly Cited Papers on the List： 0 Unfold All

WanFang Cited Count：

Chinese Cited Count：

30 Days PV： 1

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