Structural evolution and effect of the neighboring cation on the photoluminescence of Sr(LiAl3)1−x(SiMg3)xN4:Eu2+ phosphors

Mu-Huai Fang , Sebastian Mahlik , Agata Lazarowska , Marek Grinberg , Maxim S. Molokeev , Hwo-Shuenn Sheu , Jyh-Fu Lee , Ru-Shi Liu

Abstract

In this study, a series of Sr(LiAl3)(1-x)(SiMg3)(x)N-4:Eu2+ (SLA-SSM) phosphors were synthesized by a solid-solution process. The emission peak maxima of SLA-SSM range from 615nm to 680nm, which indicates structural differences in these materials. Li-7 solid-state NMR spectroscopy was utilized to distinguish between the Li(1)N-4 and Li(2)N-4 tetrahedra in SLA-SSM. Differences in the coordination environments of the two Sr sites were found which explain the unexpected luminescent properties. Three discernible morphologies were detected by scanning electron microscopy. Temperature-dependent photoluminescence and decay times were used to understand the diverse environments of europium ions in the two strontium sites Sr1 and Sr2, which also support the NMR analysis. Moreover, X-ray absorption near-edge structure studies reveal that the Eu2+ concentration in SLA-SSM is much higher than that in in SrLiAl3N4:Eu2+ and SrSiMg3N4:Eu2+ phosphors. Finally, an overall mechanism was proposed to explain the how the change in photoluminescence is controlled by the size of the coordinated cation.
Author Mu-Huai Fang
Mu-Huai Fang,,
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, Sebastian Mahlik (FMPI / IEP)
Sebastian Mahlik,,
- Institute of Experimental Physics
, Agata Lazarowska (FMPI / IEP)
Agata Lazarowska,,
- Institute of Experimental Physics
, Marek Grinberg (FMPI / IEP)
Marek Grinberg,,
- Institute of Experimental Physics
, Maxim S. Molokeev
Maxim S. Molokeev,,
-
, Hwo-Shuenn Sheu
Hwo-Shuenn Sheu,,
-
, Jyh-Fu Lee
Jyh-Fu Lee,,
-
, Ru-Shi Liu
Ru-Shi Liu,,
-
Journal seriesAngewandte Chemie-International Edition, ISSN 1433-7851, (N/A 200 pkt)
Issue year2019
Vol58
No23
Pages7767-7772
Publication size in sheets0.5
Keywords in Englishlight-emitting diodes, nitride phosphors, solid solutions
ASJC Classification1600 General Chemistry; 1503 Catalysis
DOIDOI:10.1002/anie.201903178
URL https://onlinelibrary.wiley.com/doi/epdf/10.1002/anie.201903178
Languageen angielski
Score (nominal)200
Score sourcejournalList
ScoreMinisterial score = 200.0, 27-05-2020, ArticleFromJournal
Publication indicators WoS Citations = 11; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 2.132; WoS Impact Factor: 2018 = 12.257 (2) - 2018=12.359 (5)
Citation count*15 (2020-05-25)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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