期刊
INORGANIC CHEMISTRY
卷 61, 期 23, 页码 8767-8781出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.2c00712
关键词
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资金
- Guangzhou Scientific planning program [201804010260]
- National Natural Science Foundation of China [21601081]
By manipulating the Eu2+-sensitized composition of Sr9LiMn(PO4)7 through Ln(3+) heterovalent substitution, a bright red emission with enhanced intensity can be achieved. Tb3+ doping significantly increases the emission intensity. Homovalent (Ca2+) substitution allows precise tuning of the emission color.
Despite an encouraging progress, Mn2+-activated red phosphors suffer from an insufficient emission intensity and a bad color purity. Thus, it is necessary to find a new strategy to realize a bright red emission through highly efficient Mn2+ sensitization. Herein, manipulating Eu2+-sensitized Sr9LiMn(PO4)(7) (SLMP) composition by Ln(3+) heterovalent substitution is proved to be able to substantially gain a tremendous Mn2+ emission enhancement and result in a dominant red Mn2+ emission. It is found that the emission enhancement ratio is proportional to the order of lanthanide contraction. Notably, Tb3+ doping realizes a 427-fold rise in the integrated emission intensity compared with the SLMP host, which is close to the theoretical maximum of 500. An underlying mechanism for Mn2+ red emission enhancement is proposed, which is attributed to a high-energy transfer probability from Eu2+ to Mn2+ via Ln(3+)-induced further structural confinement plus an energetic match effect. Meanwhile, homovalent (Ca2+) substitution could precisely tailor Mn2+ emitting color from orange-red to deep red. A warm-white LED device with a low color temperature of 3394 K, a high color-rendering index of 90.2, and suitable CIE coordinates of (0.403, 0.373) is fabricated using optimized phosphor SLMP:Eu2+, Th3+. These results might reveal a new strategy to develop new red-emitting phosphors with a bright and highly purified red Mn2+ emission.
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